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============================================================================== TOPIC: Daily Report #5124
== 1 of 1 == Date: Thurs, Jun 24 2010 6:57 am From: "Cooper, Joe"
HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science
DAILY REPORT #5124
PERIOD COVERED: 5am June 23 - 5am June 24, 2010 (DOY 174/09:00z-175/09:00z)
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated )
HSTARS: (None)
COMPLETED OPS REQUEST: (None)
COMPLETED OPS NOTES: (None)
SCHEDULED SUCCESSFUL
FGS GSAcq 6 6 FGS REAcq 9 9 OBAD with Maneuver 6 6
SIGNIFICANT EVENTS: (None)
OBSERVATIONS SCHEDULED:
ACS/WFC 11655
Dynamics of the Galactic Bulge/bar
We request second-epoch ACS observations of four star fields in the Galactic bar These will allow us to measure proper motions for tens of thousands of stars well below the turnoff, to construct a dynamical model for the bulge/bar (in combination with data already in hand from other HST fields, and from VLT spectroscopy), and hence to take a unique look at the internal dynamical structure of the central regions of our Galaxy By relating the kinematics with stellar population we can elucidate the formation history of the bulge and bar, and their relation to the surrounding Galactic disk This is a resubmission of an approved Cycle 15 proposal that was hit by the ACS malfunction
ACS/WFC 11996
CCD Daily Monitor (Part 3)
This program comprises basic tests for measuring the read noise and dark current of the ACS WFC and for tracking the growth of hot pixels The recorded frames are used to create bias and dark reference images for science data reduction and calibration This program will be executed four days per week (Mon, Wed, Fri, Sun) for the duration of Cycle 17 To facilitate scheduling, this program is split into three proposals This proposal covers 308 orbits (19 25 weeks) from 21 June 2010 to 1 November 2010
COS/FUV 11541
COS-GTO: Cool, Warm, and Hot Gas in the Cosmic Web and in Galaxy Halos
COS G130M and G160M 20, 000 resolution observations will be obtained for 17 QSOs to study cool, warm and hot gas in the cosmic web and in galaxy halos 5 QSOs with z from 0 177 to 0 574 and sum z = 1 68 will be observed with S/N = 40-50 per resolution element 12 QSOs with z = 0 286 to 0 669 and sum z = 5 57 will be observed with S/N = 30-40 The observations will allow a wide range of IGM studies including determining the frequency of occurrence of the different types of absorption systems detected, along with studies of the physical conditions and elemental abundances in the different systems Special emphasis will be given to a study of the properties of highly ionized IGM as traced by O VI, O V, O IV, N V, and C IV The high S/N of the observations will allow a search for broad Lyman alpha absorption and weak metal line absorption that can be crucial for the evaluation of physical conditions and elemental abundances Supporting ground based observations will allow studies of the association of the absorbers with galaxy structures along the 17 lines of sight The overall goal of the program will be to obtain the information that will allow an assessment of the baryonic content of the IGM as revealed by UV and EUV absorption lines seen in the spectra of QSOs
COS/NUV/FUV 11698
The Structure and Dynamics of Virgo's Multi-Phase Intracluster Medium
The dynamical flows of the intracluster medium (ICM) are largely unknown We propose to map the spatial and kinematic distribution of the warm ICM of the nearby Virgo cluster using the Cosmic Origins Spectrograph 15 sightlines at a range of impact parameters within the virial radius of the cluster (0 2 - 1 7 Mpc) will be probed for Lyman-alpha absorption and the data compared to blind HI, dust and x-ray surveys to create a multi-phase map of the cluster's ICM Absorption line sightlines are commonly 40-100 kpc from a galaxy, allowing the flow of baryons between galaxies and the ICM to be assessed The velocity distribution of the absorbers will be directly compared to simulations and used to constrain the turbulent motions of the ICM This proposal will result in the first map of a cluster's warm ICM and provide important tests for our theoretical understanding of cluster formation and the treatment of gas cooling in cosmological simulations
STIS/CC 11693
Follow-up Observations of Debris Disks around Two Solar-Type Stars
Circumstellar debris disks offer direct views into the structure of extrasolar planetary systems Their constituent dust, seen in scattered light and thermal emission, is created by the collisions of asteroidal and cometary parent bodies The distribution of this dust provides information on the location of the parent bodies, and can be strongly affected by planetary perturbations Dynamical signatures of planets can include asymmetries, warps, central clearings, and radial gaps in a disk, and thus are key features to search for in resolved images Following up recent Spitzer measurements, we have now detected two new, nearby debris disks in scattered light Our initial ACS F606W coronagraphic images show faint ringlike structures around the solar-type stars HD 10647 (F9V) and HD 207129 (G0V); both are also spatially resolved in Spitzer/MIPS 70 micron images The HD 10647 disk, seen close to edge-on, represents the first disk ever imaged in scattered light around a star known to have a radial velocity planet The inclined ring around HD 207129 is the faintest disk ever imaged in scattered light, and seems in the MIPS image to be asymmetric like the eccentric ring around Fomalhaut We propose to obtain deep ACS coronagraphic images of these two disks Our goals are to get definitive measurements of the dust spatial distributions (including disk asymmetries and sharpness of the ring edges), and measure the overall F606W-F814W color of each disk in order to constrain the dust properties The results will be a definitive exploration of the Kuiper belts of two nearby, Sun-like stars NOTE: HD 207129 was deleted from this program
STIS/CC 11845
CCD Dark Monitor Part 2
Monitor the darks for the STIS CCD
STIS/CC 11847
CCD Bias Monitor-Part 2
Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N superbiases and track the evolution of hot columns
STIS/CCD/MA1/MA2 11860
MAMA Spectroscopic Sensitivity and Focus Monitor
The purpose of this proposal is to monitor the sensitivity of each MAMA grating mode to detect any change due to contamination or other causes, and to also monitor the STIS focus in a spectroscopic and an imaging mode
STIS/MA1/MA2 11857
STIS Cycle 17 MAMA Dark Monitor
This proposal monitors the behavior of the dark current in each of the MAMA detectors
The basic monitor takes two 1380s ACCUM darks each week with each detector However, starting Oct 5, pairs are only included for weeks that the LRP has external MAMA observations planned The weekly pairs of exposures for each detector are linked so that they are taken at opposite ends of the same SAA free interval This pairing of exposures will make it easier to separate long and short term temporal variability from temperature dependent changes
For both detectors, additional blocks of exposures are taken once every six months These are groups of five 1314s FUV-MAMA Time-Tag darks or five 3x315s NUV ACCUM darks distributed over a single SAA-free interval This will give more information on the brightness of the FUV MAMA dark current as a function of the amount of time that the HV has been on, and for the NUV MAMA will give a better measure of the short term temperature dependence
WFC3/IR/S/C 11929
IR Dark Current Monitor
Analyses of ground test data showed that dark current signals are more reliably removed from science data using darks taken with the same exposure sequences as the science data, than with a single dark current image scaled by desired exposure time Therefore, dark current images must be collected using all sample sequences that will be used in science observations These observations will be used to monitor changes in the dark current of the WFC3-IR channel on a day-to-day basis, and to build calibration dark current ramps for each of the sample sequences to be used by Gos in Cycle 17 For each sample sequence/array size combination, a median ramp will be created and delivered to the calibration database system (CDBS)
WFC3/UVIS/IR 11644
A Dynamical-Compositional Survey of the Kuiper Belt: A New Window Into the Formation of the Outer Solar System
The eight planets overwhelmingly dominate the solar system by mass, but their small numbers, coupled with their stochastic pasts, make it impossible to construct a unique formation history from the dynamical or compositional characteristics of them alone In contrast, the huge numbers of small bodies scattered throughout and even beyond the planets, while insignificant by mass, provide an almost unlimited number of probes of the statistical conditions, history, and interactions in the solar system To date, attempts to understand the formation and evolution of the Kuiper Belt have largely been dynamical simulations where a hypothesized starting condition is evolved under the gravitational influence of the early giant planets and an attempt is made to reproduce the current observed populations With little compositional information known for the real Kuiper Belt, the test particles in the simulation are free to have any formation location and history as long as they end at the correct point Allowing compositional information to guide and constrain the formation, thermal, and collisional histories of these objects would add an entire new dimension to our understanding of the evolution of the outer solar system While ground based compositional studies have hit their flux limits already with only a few objects sampled, we propose to exploit the new capabilities of WFC3 to perform the first ever large-scale dynamical-compositional study of Kuiper Belt Objects (KBOs) and their progeny to study the chemical, dynamical, and collisional history of the region of the giant planets The sensitivity of the WFC3 observations will allow us to go up to two magnitudes deeper than our ground based studies, allowing us the capability of optimally selecting a target list for a large survey rather than simply taking the few objects that can be measured, as we have had to do to date We have carefully constructed a sample of 120 objects which provides both overall breadth, for a general understanding of these objects, plus a large enough number of objects in the individual dynamical subclass to allow detailed comparison between and within these groups These objects will likely define the core Kuiper Belt compositional sample for years to come While we have many specific results anticipated to come from this survey, as with any project where the field is rich, our current knowledge level is low, and a new instrument suddenly appears which can exploit vastly larger segments of the population, the potential for discovery -- both anticipated and not -- is extraordinary
WFC3/UVIS/IR 11909
UVIS Hot Pixel Anneal
The on-orbit radiation environment of WFC3 will continually generate new hot pixels This proposal performs the procedure required for repairing those hot pixels in the UVIS CCDs During an anneal, the two-stage thermo-electric cooler (TEC) is turned off and the four-stage TEC is used as a heater to bring the UVIS CCDs up to ~20 deg C As a result of the CCD warmup, a majority of the hot pixels will be fixed; previous instruments such as WFPC2 and ACS have seen repair rates of about 80% Internal UVIS exposures are taken before and after each anneal, to allow an assessment of the procedure's effectiveness in WFC3, provide a check of bias, global dark current, and hot pixel levels, as well as support hysteresis (bowtie) monitoring and CDBS reference file generation One IR dark is taken after each anneal, to provide a check of the IR detector
============================================================================== TOPIC: Daily Report #5127 (Corrected Copy)
== 1 of 1 == Date: Tues, Jun 29 2010 9:41 am From: "Cooper, Joe"
HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science
DAILY REPORT #5127
PERIOD COVERED: 5am June 28 - 5am June 29, 2010 (DOY 179/09:00z-180/09:00z)
FLIGHT OPERATIONS SUMMARY:
Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated )
HSTARS:
12314 - GSAcq(2,1,1) @179/20:48:02z and REAcqs(2,1,1) @179/22:23:59z and 179/23:59:50z failed to RGA Hold due to search radius limit exceeded on FGS2 REAcq(2,1,1) @180/01:35:40z was successful
Observations affected: COS #8-11 Proposal ID#11705, WFC3 #70-77 Proposal ID#11696, STIS #14-16 Proposal #11847 and WFC3 #78-79 Proposal #11905
COMPLETED OPS REQUEST:
18568-1 - LBBIAS Updates for Extended Gyro Guiding Intervals @ 179/21:36z, & 180/00:49z
COMPLETED OPS NOTES: (None)
SCHEDULED SUCCESSFUL
FGS GSAcq 5 4 FGS REAcq 9 7 OBAD with Maneuver 4 4
SIGNIFICANT EVENTS: (None)
OBSERVATIONS SCHEDULED:
ACS/WFC 11996
CCD Daily Monitor (Part 3)
This program comprises basic tests for measuring the read noise and dark current of the ACS WFC and for tracking the growth of hot pixels The recorded frames are used to create bias and dark reference images for science data reduction and calibration This program will be executed four days per week (Mon, Wed, Fri, Sun) for the duration of Cycle 17 To facilitate scheduling, this program is split into three proposals This proposal covers 308 orbits (19 25 weeks) from 21 June 2010 to 1 November 2010
COS/FUV 11895
FUV Detector Dark Monitor
Monitor the FUV detector dark rate by taking long science exposures without illuminating the detector The detector dark rate and spatial distribution of counts will be compared to pre-launch and SMOV data in order to verify the nominal operation of the detector Variations of count rate as a function of orbital position will be analyzed to find dependence of dark rate on proximity to the SAA Dependence of dark rate as function of time will also be tracked
COS/NUV 11705
Physical Properties of Quasar Outflows: From BALs to Mini-BALs
Accretion disk outflows are important components of quasar environments They might play a major role in facilitating accretion, regulating star formation in the host galaxies and distributing metals to the surrounding gas They reveal themselves most conspicuously via broad absorption lines (BALs), but they appear even more frequently in other guises such as the weaker and narrower "mini-BALs " How are these diverse outflow features related? Are mini-BALs really just "mini" versions of the BALs, or do they represent a fundamentally different type of outflow, with different degrees of ionization, column densities, mass loss rates, physical origins, etc ?
We propose HST-COS spectroscopy to make the first quantitative assessment of the outflow physical conditions across the full range of weak/narrow mini-BALs to strong/broad BALs Our strategy is to measure key diagnostic lines (SVI, OVI, CIII, SIV, PV, etc ) at 930A - 1130A (rest- frame) in a sample of 7 outflow quasars with known mini-BALs through weak BALs We will then 1) combine the COS data with ground-based spectra of the same quasars to include more lines (CIV, SiIV) at longer wavelengths, and 2) include in our analysis a nearly identical UV/optical dataset obtained previously for a sample of quasars with strong BALs Our study of this combined dataset will be an essential next step toward a more global understanding of quasar outflows
COS/NUV 11894
NUV Detector Dark Monitor
The purpose of this proposal is to measure the NUV detector dark rate by taking long science exposures with no light on the detector The detector dark rate and spatial distribution of counts will be compared to pre-launch and SMOV data in order to verify the nominal operation of the detector Variations of count rate as a function of orbital position will be analyzed to find dependence of dark rate on proximity to the SAA Dependence of dark rate as function of time will also be tracked
STIS/CC 11845
CCD Dark Monitor Part 2
Monitor the darks for the STIS CCD
STIS/CC 11847
CCD Bias Monitor-Part 2
Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N superbiases and track the evolution of hot columns
STIS/CCD 11852
STIS CCD Spectroscopic Flats C17
The purpose of this proposal is to obtain pixel-to-pixel lamp flat fields for the STIS CCD in spectroscopic mode
STIS/CCD/FGS 11848
CCD Read Noise Monitor
This proposal measures the read noise of all the amplifiers (A, B, C, D) on the STIS CCD using pairs of bias frames Full-frame and binned observations are made in both Gain 1 and Gain 4, with binning factors of 1x1, 1x2, 2x1, and 2x2 All exposures are internals Pairs of visits are scheduled monthly for the first four months and then bi-monthly after that
WFC3/IR 11696
Infrared Survey of Star Formation Across Cosmic Time
We propose to use the unique power of WFC3 slitless spectroscopy to measure the evolution of cosmic star formation from the end of the reionization epoch at z>6 to the close of the galaxy- building era at z~0 3 Pure parallel observations with the grisms have proven to be efficient for identifying line emission from galaxies across a broad range of redshifts The G102 grism on WFC3 was designed to extend this capability to search for Ly-alpha emission from the first galaxies Using up to 250 orbits of pure parallel WFC3 spectroscopy, we will observe about 40 deep (4-5 orbit) fields with the combination of G102 and G141, and about 20 shallow (2-3 orbit) fields with G141 alone
Our primary science goals at the highest redshifts are: (1) Detect Lya
in ~100 galaxies with z>5
6 and measure the evolution of the Lya
luminosity function, independent of of cosmic variance; 2) Determine
the connection between emission line selected and continuum-break
selected galaxies at these high redshifts, and 3) Search for the
proposed signature of neutral hydrogen absorption at re-ionization
At
intermediate redshifts we will (4) Detect more than 1000 galaxies in
Halpha at 0
5 To identify single-line Lya emitters, we will exploit the wide
0
8--1
9um wavelength coverage of the combined G102+G141 spectra
All
[OII] and [OIII] interlopers detected in G102 will be reliably
separated from true LAEs by the detection of at least one strong line
in the G141 spectrum, without the need for any ancillary data
We
waive all proprietary rights to our data and will make high-level data
products available through the ST/ECF
WFC3/UV 12243 Determining the Size and Shape of Dwarf Planet Haumea from a Mutual
Event The history of Haumea is closely intertwined with several unanswered
questions relating to the formation and evolution of the outer solar
system
Understanding Haumea and its satellites gives us unique
insights on the physics of KBO collisions, tides, surfaces, and
interiors
Yet, the most important physical properties of this dwarf
planet, its density and shape, remain only weakly constrained by
degenerate light curve inversions
The existence of mutual events
between Haumea and its inner satellite, Namaka, provide a rare
opportunity to measure Haumea's size, shape, density, albedo, and spin
orientation with HST photometry
These observations also constrain the
size of Namaka, the orbits of both satellites, and, through resolved
photometry, the totally unexpected rapid rotation of the outer
satellite, Hi'iaka
After extensive attempts at ground-based
observations, it is clear that only HST photometry is capable of
securely observing and characterizing a Haumea-Namaka mutual event
The proposed observations will observe the ~5-hour transit and
shadowing of Haumea by Namaka on June 28, 2010 with high
signal-to-noise using straightforward photometric observations with
WFC3
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
WFC3/UVIS/IR 11662 Improving the Radius-Luminosity Relationship for Broad-Lined AGNs with
a New Reverberation Sample The radius-luminosity (R-L) relationship is currently the fundamental
basis for all techniques used to estimate black hole masses in AGNs,
in both the nearby and distant universe
However, the current R-L
relationship is based on 34 objects that cover a limited range in
black hole mass and luminosity
To improve our understanding of black
hole growth and evolution, the R-L relationship must be extended to
cover a broader range of black hole masses using the technique known
as reverberation mapping
To this end, we have been awarded an
unprecedented 64 nights on the Lick Observatory 3-m telescope between
March 24 and May 31, 2008, to spectroscopically monitor 12 AGNs in
order to measure their black hole masses
To properly determine the
luminosities of these 12 AGNs, we must correct them for their
host-galaxy starlight contributions using high-resolution images
Previous work by Bentz et al
(2006) has shown that the starlight
correction to AGN luminosity measurements is an essential component to
interpreting the R-L relationship
The correction will be substantial
for each of the 12 sources we will monitor, as the AGNs are relatively
faint and embedded in nearby, bright galaxies
Starlight corrections
are not possible with ground-based images, as the PSF and bulge
contributions become indistinguishable under typical seeing
conditions, and adaptive optics are not yet operational in the
spectral range where the corrections are needed
In addition, spectral
decompositions are very model-dependent and are limited by the degree
of accuracy to which we understand emission processes and stellar
populations in galaxies
Without correcting for starlight, we will be
unable to apply the results of our Spring 2008 campaign to the body of
knowledge from previous reverberation mapping work
Therefore, we
propose to obtain high resolution, high dynamic range images of the
host galaxies of the 12 AGNs in our ground-based monitoring sample, as
well as one white dwarf which will be used as a PSF model
==============================================================================
TOPIC: Daily Report #5128 == 1 of 1 ==
Date: Wed, Jun 30 2010 8:41 am
From: "Cooper, Joe" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5128 PERIOD COVERED: 5am June 29 - 5am June 30, 2010 (DOY 180/09:00z-181/09:00z) FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: FOR DOY 165 12315 - GSAcq(1,2,1) at 165/05:17:55z required two attempts to achieve
FL-DV on FGS1
The initial attempt resulted in scan step limit
exceeded
The acq was successful
COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 6 6
FGS REAcq 8 8
OBAD with Maneuver 4 4 SIGNIFICANT EVENTS: (None) OBSERVATIONS SCHEDULED: ACS/SBC 11886 UV Contamination Monitor The observations consist of imaging and spectroscopy with SBC and HRC
of the cluster NGC 6681 in order to monitor the temporal evolution of
the UV sensitivity of the SBC and the HRC
COS/NUV 11705 Physical Properties of Quasar Outflows: From BALs to Mini-BALs Accretion disk outflows are important components of quasar
environments
They might play a major role in facilitating accretion,
regulating star formation in the host galaxies and distributing metals
to the surrounding gas
They reveal themselves most conspicuously via
broad absorption lines (BALs), but they appear even more frequently in
other guises such as the weaker and narrower "mini-BALs
" How are
these diverse outflow features related? Are mini-BALs really just
"mini" versions of the BALs, or do they represent a fundamentally
different type of outflow, with different degrees of ionization,
column densities, mass loss rates, physical origins, etc
? We propose HST-COS spectroscopy to make the first quantitative
assessment of the outflow physical conditions across the full range of
weak/narrow mini-BALs to strong/broad BALs
Our strategy is to measure
key diagnostic lines (SVI, OVI, CIII, SIV, PV, etc
) at 930A - 1130A
(rest- frame) in a sample of 7 outflow quasars with known mini-BALs
through weak BALs
We will then 1) combine the COS data with
ground-based spectra of the same quasars to include more lines (CIV,
SiIV) at longer wavelengths, and 2) include in our analysis a nearly
identical UV/optical dataset obtained previously for a sample of
quasars with strong BALs
Our study of this combined dataset will be
an essential next step toward a more global understanding of quasar
outflows
STIS/CC 11845 CCD Dark Monitor Part 2 Monitor the darks for the STIS CCD
STIS/CC 11847 CCD Bias Monitor-Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns
WFC3/ACS/UVIS 11684 The First Proper Motion Measurement for M31: Dynamics and Mass of the
Local Group We will perform observations to determine the proper motion of the
Andromeda galaxy M31, which has been sought for almost a century
without success
While challenging, this measurement has now become
possible due to the availability of existing deep ACS/WFC images of
several M31 fields
The requested second epoch images will yield the
average shift of the M31 stars with respect to compact galaxies in the
background
Our observing strategy uses six different fields (three
primary and three coordinated parallel) with two different instruments
(ACS and WFC3) to provide a maximum handle on possible systematic
effects
The expected result will be sufficiently accurate to: (a)
discriminate between different histories for the dynamics of the Local
Group; (b) constrain the mass distribution of the Local Group; (c)
determine the details of the expected future merger between M31 and
the Milky Way; (d) infer the past interaction history between M31 and
M33; (e) constrain the internal proper motion kinematics of the M31
spheroid, outer disk, and tidal stream; and (f) obtain a pilot
estimate of the M31 distance through the method of rotational
parallax
WFC3/IR 11671 Kinematic Reconstruction of the Origin and IMF of the Massive Young
Clusters at the Galactic Center We propose to exploit the wide field capabilities of Wide Field Camera
3 to study star formation at the Galactic center
By studying young
stars located in the most physically extreme region of our Galaxy, we
can test star formation theories, which suggest that such environments
should favor high mass stars and, in extreme cases, should suppress
star formation entirely
Specifically, we will measure the proper
motions and photometry of stars over the full extent of the three
massive young clusters that have been identified at the Galactic
Center (Arches, Quintuplet, and the Young Nuclear Star Cluster)
These
observations are a factor of ?2000 more efficient than what can be
done with ground-based adaptive optics
Our goals are two-fold
First,
we hope to establish the initial sites of star formation in order to
obtain an accurate estimate of the conditions that led to the stellar
populations within these clusters
Answering this question for the
Young Nuclear Star Cluster is particularly important as it establishes
whether or not star formation can indeed proceed within 0
1 pc of our
Galaxy?s supermassive black hole
Second, we will measure the IMF in
the Arches and Quintuplet, where dynamical evolution is less severe,
using proper motions to determine membership and to reveal the tidal
radius
Probing how the properties of the emergent stellar populations
within our Galaxy may be affected by the physical environment in which
they arise is an important first step to understanding how they might
vary as a function of cosmic time and thereby affect our models of
galaxy formation and evolution
WFC3/IR 11696 Infrared Survey of Star Formation Across Cosmic Time We propose to use the unique power of WFC3 slitless spectroscopy to
measure the evolution of cosmic star formation from the end of the
reionization epoch at z>6 to the close of the galaxy- building era at
z~0
3
Pure parallel observations with the grisms have proven to be
efficient for identifying line emission from galaxies across a broad
range of redshifts
The G102 grism on WFC3 was designed to extend this
capability to search for Ly-alpha emission from the first galaxies
Using up to 250 orbits of pure parallel WFC3 spectroscopy, we will
observe about 40 deep (4-5 orbit) fields with the combination of G102
and G141, and about 20 shallow (2-3 orbit) fields with G141 alone
Our primary science goals at the highest redshifts are: (1) Detect Lya
in ~100 galaxies with z>5
6 and measure the evolution of the Lya
luminosity function, independent of of cosmic variance; 2) Determine
the connection between emission line selected and continuum-break
selected galaxies at these high redshifts, and 3) Search for the
proposed signature of neutral hydrogen absorption at re-ionization
At
intermediate redshifts we will (4) Detect more than 1000 galaxies in
Halpha at 0
5 To identify single-line Lya emitters, we will exploit the wide
0
8--1
9um wavelength coverage of the combined G102+G141 spectra
All
[OII] and [OIII] interlopers detected in G102 will be reliably
separated from true LAEs by the detection of at least one strong line
in the G141 spectrum, without the need for any ancillary data
We
waive all proprietary rights to our data and will make high-level data
products available through the ST/ECF
WFC3/IR/S/C 11929 IR Dark Current Monitor Analyses of ground test data showed that dark current signals are more
reliably removed from science data using darks taken with the same
exposure sequences as the science data, than with a single dark
current image scaled by desired exposure time
Therefore, dark current
images must be collected using all sample sequences that will be used
in science observations
These observations will be used to monitor
changes in the dark current of the WFC3-IR channel on a day-to-day
basis, and to build calibration dark current ramps for each of the
sample sequences to be used by Gos in Cycle 17
For each sample
sequence/array size combination, a median ramp will be created and
delivered to the calibration database system (CDBS)
WFC3/UVIS 11630 Monitoring Active Atmospheres on Uranus and Neptune We propose Snapshot observations of Uranus and Neptune to monitor
changes in their atmospheres on time scales of weeks and months, as we
have been doing for the past seven years
Previous Hubble Space
Telescope observations (including previous Snapshot programs 8634,
10170, 10534, and 11156), together with near-IR images obtained using
adaptive optics on the Keck Telescope, reveal both planets to be
dynamic worlds which change on time scales ranging from hours to
(terrestrial) years
Uranus equinox occurred in December 2007, and the
northern hemisphere is becoming fully visible for the first time since
the early 1960s
HST observations during the past several years
(Hammel et al
2005, Icarus 175, 284 and references therein) have
revealed strongly wavelength-dependent latitudinal structure, the
presence of numerous visible-wavelength cloud features in the northern
hemisphere, at least one very long- lived discrete cloud in the
southern hemisphere, and in 2006 the first clearly defined dark spot
seen on Uranus
Long term ground-based observations (Lockwood and
Jerzekiewicz, 2006, Icarus 180, 442; Hammel and Lockwood 2007, Icarus
186, 291) reveal seasonal brightness changes that seem to demand the
appearance of a bright northern polar cap within the next few years
Recent HST and Keck observations of Neptune (Sromovsky et al
2003,
Icarus 163, 256 and references therein) show a general increase in
activity at south temperate latitudes until 2004, when Neptune
returned to a rather Voyager-like appearance with discrete bright
spots rather than active latitude bands
Further Snapshot observations
of these two dynamic planets will elucidate the nature of long-term
changes in their zonal atmospheric bands and clarify the processes of
formation, evolution, and dissipation of discrete albedo features
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
WFC3/UVIS 11908 Cycle 17: UVIS Bowtie Monitor Ground testing revealed an intermittent hysteresis type effect in the
UVIS detector (both CCDs) at the level of ~1%, lasting hours to days
Initially found via an unexpected bowtie-shaped feature in flatfield
ratios, subsequent lab tests on similar e2v devices have since shown
that it is also present as simply an overall offset across the entire
CCD, i
e
, a QE offset without any discernable pattern
These lab
tests have further revealed that overexposing the detector to count
levels several times full well fills the traps and effectively
neutralizes the bowtie
Each visit in this proposal acquires a set of
three 3x3 binned internal flatfields: the first unsaturated image will
be used to detect any bowtie, the second, highly exposed image will
neutralize the bowtie if it is present, and the final image will allow
for verification that the bowtie is gone
WFC3/UVIS/IR 11700 Bright Galaxies at z>7
5 with a WFC3 Pure Parallel Survey The epoch of reionization represents a special moment in the history
of the Universe as it is during this era that the first galaxies and
star clusters are formed
Reionization also profoundly affects the
environment where subsequent generations of galaxies evolve
Our
overarching goal is to test the hypothesis that galaxies are
responsible for reionizing neutral hydrogen
To do so we propose to
carry out a pure parallel WFC3 survey to constrain the bright end of
the redshift z>7
5 galaxy luminosity function on a total area of 176
arcmin^2 of sky
Extrapolating the evolution of the luminosity
function from z~6, we expect to detect about 20 Lyman Break Galaxies
brighter than M_* at z~8 significantly improving the current sample of
only a few galaxies known at these redshifts
Finding significantly
fewer objects than predicted on the basis of extrapolation from z=6
would set strong limits to the brightness of M_*, highlighting a fast
evolution of the luminosity function with the possible implication
that galaxies alone cannot reionize the Universe
Our observations
will find the best candidates for spectroscopic confirmation, that is
bright z>7
5 objects, which would be missed by small area deeper
surveys
The random pointing nature of the program is ideal to beat
cosmic variance, especially severe for luminous massive galaxies,
which are strongly clustered
In fact our survey geometry of 38
independent fields will constrain the luminosity function like a
contiguous single field survey with two times more area at the same
depth
Lyman Break Galaxies at z>7
5 down to m_AB=26
85 (5 sigma) in
F125W will be selected as F098M dropouts, using three to five orbits
visits that include a total of four filters (F606W, F098M, F125W,
F160W) optimized to remove low-redshift interlopers and cool stars
Our data will be highly complementary to a deep field search for high-
z galaxies aimed at probing the faint end of the luminosity function,
allowing us to disentangle the degeneracy between faint end slope and
M_* in a Schechter function fit of the luminosity function
We waive
proprietary rights for the data
In addition, we commit to release the
coordinates and properties of our z>7
5 candidates within one month
from the acquisition of each field
==============================================================================
TOPIC: Daily Report #5129 == 1 of 1 ==
Date: Thurs, Jul 1 2010 8:09 am
From: "Cooper, Joe" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5129 PERIOD COVERED: 5am June 30 - 5am July 1, 2010 (DOY 181/09:00z-182/09:00z) FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: 12319 - REAcq(1,2,1) scheduled at 181/19:43:29z - 19:47:55z required
three attempts to achieve FL-DV on FGS-2
The acquisition was
successful
Observations possibly affected: ACS 34, 35, Proposal ID#11669
FOR DOY 172 12317 - GSAcq(2,1,1) at 172/14:53:57z required two attempts to achieve
CT-DV on FGS2
The acquisition was successful
FOR DOY 178 12318 - GSAcq(2,1,1) at 178/21:01:47z required two attempts to
maintain lock
The second attempt was successful
COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 7 7
FGS REAcq 7 7
OBAD with Maneuver 3 3 SIGNIFICANT EVENTS: (None) OBSERVATIONS SCHEDULED: ACS/WFC 11996 CCD Daily Monitor (Part 3) This program comprises basic tests for measuring the read noise and
dark current of the ACS WFC and for tracking the growth of hot pixels
The recorded frames are used to create bias and dark reference images
for science data reduction and calibration
This program will be
executed four days per week (Mon, Wed, Fri, Sun) for the duration of
Cycle 17
To facilitate scheduling, this program is split into three
proposals
This proposal covers 308 orbits (19
25 weeks) from 21 June
2010 to 1 November 2010
ACS/WFC3 11669 The Origins of Short Gamma-Ray Bursts During the past decade extraordinary progress has been made in
determining the origin of long- duration gamma-ray bursts
It has been
conclusively shown that these objects derive from the deaths of
massive stars
Nonetheless, the origin of their observational cousins,
short-duration gamma-ray bursts (SGRBs) remains a mystery
While SGRBs
are widely thought to result from the inspiral of compact binaries,
this is a conjecture
SGRBs have been found in elliptical galaxies,
Abell Clusters, star-forming dwarfs and even an edge-on spiral
Whether they primarily result from an old population, a young
population, or rapid evolution of binaries in globular clusters
remains open
Here we propose to employ two related sets of observations which may
dramatically advance our understanding of short bursts
The first is a
variant of a technique that we pioneered and used to great effect in
elucidating the origins of long-duration bursts
We will examine a
statistical sample of hosts and measure the degree to which SGRB
locations trace the red or blue light of their hosts, and thus old or
young stellar populations
This will allow us to study the
demographics of the SGRB population in a manner largely free of the
distance dependent selection effects which have so far bedeviled this
field
In the second line of attack we will use two targets of
opportunity to obtain extremely precise positions of up to two nearby
bursts -- one on a star-forming galaxy and the other on a elliptical
Observation of the star-formation galaxy could link at least some
bursts directly to a young population; however, a discovery in later
images of a globular cluster at the site of the explosion in an
elliptical would provide revolutionary evidence that SGRBs are formed
from compact binaries
STIS/CC 11845 CCD Dark Monitor Part 2 Monitor the darks for the STIS CCD
STIS/CC 11847 CCD Bias Monitor-Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns
WFC3/ACS/IR 11597 Spectroscopy of IR-Selected Galaxy Clusters at 1 < z < 1
5 We propose to obtain WFC3 G141 and G102 slitless spectroscopy of
galaxy clusters at 1 < z < 1
5 that were selected from the IRAC survey
of the Bootes NDWFS field
Our IRAC survey contains the largest sample
of spectroscopically confirmed clusters at z > 1
The WFC3 grism data
will measure H-alpha to determine SFR, and fit models to the low
resolution continua to determine stellar population histories for the
brighter cluster members, and redshifts for the red galaxies too faint
for ground-based optical spectroscopy
WFC3/UV/ACS/WFC 11739 Multiple Stellar Generations in the Unique Globular Clusters NGC 6388
and NGC 6441 Over the last few years HST observations have resulted in one of the
most exciting and unexpected developments in stellar population
studies: the discovery of multiple generations of stars in several
globular clusters
The finding of multiple main sequences in the
massive clusters NGC 2808 and Omega Centauri, and multiple subgiant
branches in NGC 1851, M54, and NGC 6388 has challenged the long-held
paradigm that globular clusters are simple stellar populations
Even
more surprising, given the spectroscopic and photometric constraints,
the only viable explanation for the main sequence splitting appears to
be Helium enrichment, up to an astonishingly high Y=0
4
The
conditions under which certain globulars experience the formation of
multiple stellar generations remain mysterious, and even more so the
helium-enrichment phenomenon
Such an enrichment has important
implications for chemical-enrichment, star-formation, and
stellar-evolution scenarios, in star clusters and likely elsewhere
To
properly constrain the multiple main sequence phenomenon, it is
important to determine its extent among GCs: is it limited to Omega
Cen and NGC2808, or is it more common? We propose deep WFC3 optical/IR
imaging of NGC 6388 and 6441, the two globular clusters that are most
likely to host multiple, helium-enriched populations
Our simulations
of WFC3 performance suggest that we will be able to detect even the
main sequence splittings caused by small He differences (Delta Y
<0
03)
WFC3/UVIS 11697 Proper Motion Survey of Classical and SDSS Local Group Dwarf Galaxies Using the superior resolution of HST, we propose to continue our
proper motion survey of Galactic dwarf galaxies
The target galaxies
include one classical dwarf, Leo II, and six that were recently
identified in the Sloan Digital Sky Survey data: Bootes I, Canes
Venatici I, Canes Venatici II, Coma Berenices, Leo IV, and Ursa Major
II
We will observe a total of 16 fields, each centered on a
spectroscopically-confirmed QSO
Using QSOs as standards of rest in
measuring absolute proper motions has proven to be the most accurate
and most efficient method
HST is our only option to quickly determine
the space motions of the SDSS dwarfs because suitable ground-based
imaging is only a few years old and such data need several decades to
produce a proper motion
The two most distant galaxies in our sample
will require time baselines of four years to achieve our goal of a
30-50 km/s uncertainty in the tangential velocity; given this and the
finite lifetime of HST, it is imperative that first-epoch observations
be taken in this cycle
The SDSS dwarfs have dramatically lower
surface brightnesses and luminosities than the classical dwarfs
Proper motions are crucial for determining orbits of the galaxies and
knowing the orbits will allow us to test theories for the formation
and evolution of these galaxies and, more generally, for the formation
of the Local Group
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
WFC3/UVIS 11911 UVIS L-Flats and Geometric Distortion Multiple pointing observations of the globular cluster Omega Centauri
(NGC 5139) will be used to measure the filter-dependent low frequency
flat field (L-flat) corrections and stability for a key set of 10
broadband filters used by GO programs
The selected filters are F225W,
F275W, F336W, F390W, F438W, F555W, F606W, F775W, F814W and F850LP
By
measuring relative changes in brightness of a star over different
portions of the detector, we will determine local variations in the
UVIS detector response
The broad wavelength range covered by these observations will allow us
to derive the L-flat correction for the remaining wide, medium and
narrow-band UVIS filters
The same data will also be used to determine
and correct the geometric distortion that affects UVIS data
The broad
wavelength range covered by these observations will allow us to
measure the geometric distortion dependence with wavelength and
filters and to provide the most appropriate correction over the entire
wavelength range provided by UVIS
WFC3/UVIS/IR 11662 Improving the Radius-Luminosity Relationship for Broad-Lined AGNs with
a New Reverberation Sample The radius-luminosity (R-L) relationship is currently the fundamental
basis for all techniques used to estimate black hole masses in AGNs,
in both the nearby and distant universe
However, the current R-L
relationship is based on 34 objects that cover a limited range in
black hole mass and luminosity
To improve our understanding of black
hole growth and evolution, the R-L relationship must be extended to
cover a broader range of black hole masses using the technique known
as reverberation mapping
To this end, we have been awarded an
unprecedented 64 nights on the Lick Observatory 3-m telescope between
March 24 and May 31, 2008, to spectroscopically monitor 12 AGNs in
order to measure their black hole masses
To properly determine the
luminosities of these 12 AGNs, we must correct them for their
host-galaxy starlight contributions using high-resolution images
Previous work by Bentz et al
(2006) has shown that the starlight
correction to AGN luminosity measurements is an essential component to
interpreting the R-L relationship
The correction will be substantial
for each of the 12 sources we will monitor, as the AGNs are relatively
faint and embedded in nearby, bright galaxies
Starlight corrections
are not possible with ground-based images, as the PSF and bulge
contributions become indistinguishable under typical seeing
conditions, and adaptive optics are not yet operational in the
spectral range where the corrections are needed
In addition, spectral
decompositions are very model-dependent and are limited by the degree
of accuracy to which we understand emission processes and stellar
populations in galaxies
Without correcting for starlight, we will be
unable to apply the results of our Spring 2008 campaign to the body of
knowledge from previous reverberation mapping work
Therefore, we
propose to obtain high resolution, high dynamic range images of the
host galaxies of the 12 AGNs in our ground-based monitoring sample, as
well as one white dwarf which will be used as a PSF model
WFC3/UVIS/IR 11700 Bright Galaxies at z>7
5 with a WFC3 Pure Parallel Survey The epoch of reionization represents a special moment in the history
of the Universe as it is during this era that the first galaxies and
star clusters are formed
Reionization also profoundly affects the
environment where subsequent generations of galaxies evolve
Our
overarching goal is to test the hypothesis that galaxies are
responsible for reionizing neutral hydrogen
To do so we propose to
carry out a pure parallel WFC3 survey to constrain the bright end of
the redshift z>7
5 galaxy luminosity function on a total area of 176
arcmin^2 of sky
Extrapolating the evolution of the luminosity
function from z~6, we expect to detect about 20 Lyman Break Galaxies
brighter than M_* at z~8 significantly improving the current sample of
only a few galaxies known at these redshifts
Finding significantly
fewer objects than predicted on the basis of extrapolation from z=6
would set strong limits to the brightness of M_*, highlighting a fast
evolution of the luminosity function with the possible implication
that galaxies alone cannot reionize the Universe
Our observations
will find the best candidates for spectroscopic confirmation, that is
bright z>7
5 objects, which would be missed by small area deeper
surveys
The random pointing nature of the program is ideal to beat
cosmic variance, especially severe for luminous massive galaxies,
which are strongly clustered
In fact our survey geometry of 38
independent fields will constrain the luminosity function like a
contiguous single field survey with two times more area at the same
depth
Lyman Break Galaxies at z>7
5 down to m_AB=26
85 (5 sigma) in
F125W will be selected as F098M dropouts, using three to five orbits
visits that include a total of four filters (F606W, F098M, F125W,
F160W) optimized to remove low-redshift interlopers and cool stars
Our data will be highly complementary to a deep field search for high-
z galaxies aimed at probing the faint end of the luminosity function,
allowing us to disentangle the degeneracy between faint end slope and
M_* in a Schechter function fit of the luminosity function
We waive
proprietary rights for the data
In addition, we commit to release the
coordinates and properties of our z>7
5 candidates within one month
from the acquisition of each field
==============================================================================
TOPIC: Daily Rpt #5130 == 1 of 1 ==
Date: Fri, Jul 2 2010 9:05 am
From: "Bassford, Lynn" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5130 PERIOD COVERED: 5am July 1 - 5am July 2, 2010 (DOY 182/09:00z-183/09:00z) FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: (None) COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 4 4
FGS REAcq 12 12
OBAD with Maneuver 4 4 SIGNIFICANT EVENTS: (None) OBSERVATIONS SCHEDULED: ACS/WFC3 11586 Exceptional Galactic Halo Globular Clusters and the Second Parameter We propose to obtain deep ACS-WFC images of six globular clusters
(five of which have no previous HST photometry) that reside in the
Galactic halo, where the second parameter effect is most pronounced
These globular clusters are among the least studied in the Galaxy and
yet, from the perspective of the second parameter phenomenon, the most
intriguing
With the best available CMDs only reaching the vicinity of the main
sequence turn off at present, the unique sensitivity and resolution of
ACS-WFC will yield ages of unprecedented precision for these clusters
These data will provide us with new insight into the stellar
populations present in the outer Galactic halo and the nature of the
second parameter
The second parameter plays a critical role in our
understanding of the formation and evolution of the Galaxy and the
proposed observations will shed new light on this problem and these
exceptional clusters
COS/NUV/FUV 11659 Probing the Interior of SN1006 The remnant of SN 1006 is unique among all supernova remnants in
having 3 identified background UV sources that can be used to probe
cold, otherwise unseen ejecta within the remnant shell
We propose
high-resolution spectra from COS to obtain spectra of all three of
these
The brightest of these, the Schweizer-Middleditch star (the
only one with extensive previous high-quality UV spectra) shows Si II
absorption with an extremely unusual asymmetric profile with a sharp
edge on the red end, indicating the velocity of material just entering
the reverse shock
Our new spectrum can be compared with STIS
observations from 1999 to measure definitively the velocity change as
the reverse shock eats its way into ever-more- slowly-expanding
ejecta
One may well ask, however, if this profile is truly
representative, and we seek to answer that with a spectrum of a
background quasar at a similar distance of the SM star from the
projected center, but in a different direction
And by investigating
the detailed structure of these two sources and a second quasar, we
can probe small-scale structure in the ejecta
No object other than
SN1006 offers a similar opportunity to probe the distribution of
ejecta within the remnant of a Type Ia supernova
S/C 12046 COS FUV DCE Memory Dump Whenever the FUV detector high voltage is on, count rate and current
draw information is collected, monitored, and saved to DCE memory
Every 10 msec the detector samples the currents from the HV power
supplies (HVIA, HVIB) and the AUX power supply (AUXI)
The last 1000
samples are saved in memory, along with a histogram of the number of
occurrences of each current value
In the case of a HV transient (known as a "crackle" on FUSE), where
one of these currents exceeds a preset threshold for a persistence
time, the HV will shut down, and the DCE memory will be dumped and
examined as part of the recovery procedure
However, if the current
exceeds the threshold for less than the persistence time (a
"mini-crackle" in FUSE parlance), there is no way to know without
dumping DCE memory
By dumping and examining the histograms regularly,
we will be able to monitor any changes in the rate of "mini-crackles"
and thus learn something about the state of the detector
STIS/CC 11845 CCD Dark Monitor Part 2 Monitor the darks for the STIS CCD
STIS/CC 11847 CCD Bias Monitor-Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns
STIS/CCD/MA1/MA2 11839 The Cycles of Alpha Centauri This is the HST part of a joint Chandra/HST observing program
The
objective of the HST part is to obtain new UV spectra of both
components of the Alpha Centauri binary: the primary ("Alpha Cen A")
is a near twin of the Sun, while the companion ("B") is an early K
dwarf, slightly less massive, smaller and less luminous than the Sun
The orbital period is 80 yr, and the two stars currently are separated
by about 8"
The Alpha Cen system has been the subject of long term
coronal X-ray monitoring by four successive generations of space
observatories, and extensive UV measurements were obtained
periodically during the IUE era, from the late 1970's to late 1990's
The present program will obtain new STIS echelle spectra of both
stars, which each were observed in selected wavelength windows by GHRS
in the mid-1990's, and Alpha Cen A later by STIS in an extensive
high-res program in 1999, although B unfortunately never was recorded
by STIS
WFC3/IR 11631 Binary Brown Dwarfs and the L/T Transition Brown dwarfs traverse spectral types M, L and T as their atmospheric
structure evolves and they cool into oblivion
This SNAPSHOT program
will obtain WFC3-IR images of 45 nearby late-L and early-T dwarfs to
investigate the nature of the L/T transition
Recent analyses have
suggested that a substantial proportion of late-L and early-T dwarfs
are binaries, comprised of an L dwarf primary and T dwarf secondary
WFC3-IR observations will let us quantify this suggestion by expanding
coverage to a much larger sample, and permitting comparison of the L/T
binary fraction against ?normal? ultracool dwarfs
Only eight L/T
binaries are currently known, including several that are poorly
resolved: we anticipate at least doubling the number of resolved
systems
The photometric characteristics of additional resolved
systems will be crucial to constraining theoretical models of these
late-type ultracool dwarfs
Finally, our data will also be eminently
suited to searching for extremely low luminosity companions,
potentially even reaching the Y dwarf regime
WFC3/IR 11648 WFC3 Spectroscopy of an X-ray Luminous Galaxy Cluster at z>2 We propose to obtain deep WFC3+G141 grism observations to
spectroscopically confirm a remarkable z>2 cluster of galaxy
candidate
Over a 1000 arcmin^2 field imaged with Spitzer's IRAC we
have discovered a compact (<30ÕÕ diameter) concentration of extremely
red galaxies with a factor of >40 overdensity over the adjacent field
Among these galaxies for which we can derive meaningful photometric
redshifts, 17 are consistent with zphot=2-2
5, making it very likely
that the concentration is a real cluster at such high redshift
This
is further supported by a 3
5 sigma detection of extended X-Ray
emission on XMM-Newton data, by a likely color magnitude sequence of
red galaxies, and by the presence of a giant galaxy consistent with a
BCG at the cluster redshift
The general faintness of the red galaxies
in all optical bands and their high redshifts prevent confirmation of
this cluster with ordinary optical spectroscopy
The WFC3 camera with
G141 grism provides the only way to confirm this record high-z cluster
and measure its redshift from spectral breaks typical of old stellar
populations
Our deep integrations will reveal redshifts for at least
19 ultra-red galaxies in the area and of a similar number of bluer
galaxies at the cluster redshift
Knowledge of the cluster redshift
based on the HST spectra will allow us to reach important scientific
aims: find the most distant Xray emitting evolved galaxy cluster,
determine membership of the other galaxies from photometric SED
analysis, study their stellar population properties, characterize the
color-magnitude relation with constraints on the formation redshift
The proposed observations will establish a first z>2 benchmark for
cluster field comparisons of galaxy formation at this highest redshift
and will firmly establish the progenitors of local rich Abell
clusters
WFC3/IR 11915 IR Internal Flat Fields This program is the same as 11433 (SMOV) and depends on the completion
of the IR initial alignment (Program 11425)
This version contains
three instances of 37 internal orbits: to be scheduled early, middle,
and near the end of Cycle 17, in order to use the entire 110-orbit
allocation
In this test, we will study the stability and structure of the IR
channel flat field images through all filter elements in the WFC3-IR
channel
Flats will be monitored, i
e
to capture any temporal trends
in the flat fields and delta flats produced
High signal observations
will provide a map of the pixel-to-pixel flat field structure, as well
as identify the positions of any dust particles
WFC3/IR/S/C 11929 IR Dark Current Monitor Analyses of ground test data showed that dark current signals are more
reliably removed from science data using darks taken with the same
exposure sequences as the science data, than with a single dark
current image scaled by desired exposure time
Therefore, dark current
images must be collected using all sample sequences that will be used
in science observations
These observations will be used to monitor
changes in the dark current of the WFC3-IR channel on a day-to-day
basis, and to build calibration dark current ramps for each of the
sample sequences to be used by Gos in Cycle 17
For each sample
sequence/array size combination, a median ramp will be created and
delivered to the calibration database system (CDBS)
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
WFC3/UVIS 11908 Cycle 17: UVIS Bowtie Monitor Ground testing revealed an intermittent hysteresis type effect in the
UVIS detector (both CCDs) at the level of ~1%, lasting hours to days
Initially found via an unexpected bowtie-shaped feature in flatfield
ratios, subsequent lab tests on similar e2v devices have since shown
that it is also present as simply an overall offset across the entire
CCD, i
e
, a QE offset without any discernable pattern
These lab
tests have further revealed that overexposing the detector to count
levels several times full well fills the traps and effectively
neutralizes the bowtie
Each visit in this proposal acquires a set of
three 3x3 binned internal flatfields: the first unsaturated image will
be used to detect any bowtie, the second, highly exposed image will
neutralize the bowtie if it is present, and the final image will allow
for verification that the bowtie is gone
==============================================================================
TOPIC: Daily Report #5131 == 1 of 1 ==
Date: Tues, Jul 6 2010 6:36 am
From: "Bassford, Lynn" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5131 PERIOD COVERED: 5am July 2 - 5am July 6, 2010 (DOY 183/09:00z-187/09:00z) FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: (None) COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 27 27
FGS REAcq 32 32
OBAD with Maneuver 20 20 SIGNIFICANT EVENTS: (None) OBSERVATIONS SCHEDULED: STIS/CCD 11999 JWST Calibration from a Consistent Absolute Calibration of Spitzer &
Hubble Recently, Gordon, Bohlin, et al
submitted a successful Spitzer
proposal for cross calibration of HST and Spitzer
The
cross-calibration targets are stars in three categories: WDs, A-stars,
and G-stars
Traditionally, IR flux standards are extrapolations of
stellar models that are tied to absolute fluxes at shorter
wavelengths
HST absolute flux standards are among the best available
with a solid basis that uses pure hydrogen models of hot WD stars for
the SED slopes and is tied to Vega at 5556A via precise Landolt V-band
photometry
Consistently matching models to our three categories of
HST observations along with Spitzer photometry and the few existing
absolute IR flux determinations will provide a solid basis for JWST
flux calibration over its 0
8-30micron range
The goal of this
proposal is to complete the HST observations of the set of HST/Spitzer
cross-calibration stars
Using a variety of standard stars with three
different spectral types will ensure that the final calibration is not
significantly affected by systematic uncertainties
ACS/WFC 11996 CCD Daily Monitor (Part 3) This program comprises basic tests for measuring the read noise and
dark current of the ACS WFC and for tracking the growth of hot pixels
The recorded frames are used to create bias and dark reference images
for science data reduction and calibration
This program will be
executed four days per week (Mon, Wed, Fri, Sun) for the duration of
Cycle 17
To facilitate scheduling, this program is split into three
proposals
This proposal covers 308 orbits (19
25 weeks) from 21 June
2010 to 1 November 2010
WFC3/IR/S/C 11929 IR Dark Current Monitor Analyses of ground test data showed that dark current signals are more
reliably removed from science data using darks taken with the same
exposure sequences as the science data, than with a single dark
current image scaled by desired exposure time
Therefore, dark current
images must be collected using all sample sequences that will be used
in science observations
These observations will be used to monitor
changes in the dark current of the WFC3-IR channel on a day-to-day
basis, and to build calibration dark current ramps for each of the
sample sequences to be used by Gos in Cycle 17
For each sample
sequence/array size combination, a median ramp will be created and
delivered to the calibration database system (CDBS)
WFC3/IR 11926 IR Zero Points We will measure and monitor the zeropoints through the IR filters
using observations of the white dwarf standard stars, GD153, GD71 and
GD191B2B and the solar analog standard star, P330E
Data will be taken
monthly during Cycle 17
Observations of the star cluster, NGC 104,
are made twice to check color transformations
We expect an accuracy
of 2% in the wide filter zeropoints relative to the HST photometric
system, and 5% in the medium- and narrow-band filters
WFC3/IR 11915 IR Internal Flat Fields This program is the same as 11433 (SMOV) and depends on the completion
of the IR initial alignment (Program 11425)
This version contains
three instances of 37 internal orbits: to be scheduled early, middle,
and near the end of Cycle 17, in order to use the entire 110-orbit
allocation
In this test, we will study the stability and structure of the IR
channel flat field images through all filter elements in the WFC3-IR
channel
Flats will be monitored, i
e
to capture any temporal trends
in the flat fields and delta flats produced
High signal observations
will provide a map of the pixel-to-pixel flat field structure, as well
as identify the positions of any dust particles
WFC3/UVIS 11911 UVIS L-Flats and Geometric Distortion Multiple pointing observations of the globular cluster Omega Centauri
(NGC 5139) will be used to measure the filter-dependent low frequency
flat field (L-flat) corrections and stability for a key set of 10
broadband filters used by GO programs
The selected filters are F225W,
F275W, F336W, F390W, F438W, F555W, F606W, F775W, F814W and F850LP
By
measuring relative changes in brightness of a star over different
portions of the detector, we will determine local variations in the
UVIS detector response
The broad wavelength range covered by these observations will allow us
to derive the L-flat correction for the remaining wide, medium and
narrow-band UVIS filters
The same data will also be used to determine
and correct the geometric distortion that affects UVIS data
The broad
wavelength range covered by these observations will allow us to
measure the geometric distortion dependence with wavelength and
filters and to provide the most appropriate correction over the entire
wavelength range provided by UVIS
WFC3/UVIS 11908 Cycle 17: UVIS Bowtie Monitor Ground testing revealed an intermittent hysteresis type effect in the
UVIS detector (both CCDs) at the level of ~1%, lasting hours to days
Initially found via an unexpected bowtie-shaped feature in flatfield
ratios, subsequent lab tests on similar e2v devices have since shown
that it is also present as simply an overall offset across the entire
CCD, i
e
, a QE offset without any discernable pattern
These lab
tests have further revealed that overexposing the detector to count
levels several times full well fills the traps and effectively
neutralizes the bowtie
Each visit in this proposal acquires a set of
three 3x3 binned internal flatfields: the first unsaturated image will
be used to detect any bowtie, the second, highly exposed image will
neutralize the bowtie if it is present, and the final image will allow
for verification that the bowtie is gone
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
COS/FUV 11897 FUV Spectroscopic Sensitivity Monitoring The purpose of this proposal is to monitor sensitivity in each FUV
grating mode to detect any changes due to contamination or other
causes
COS/FUV 11895 FUV Detector Dark Monitor Monitor the FUV detector dark rate by taking long science exposures
without illuminating the detector
The detector dark rate and spatial
distribution of counts will be compared to pre-launch and SMOV data in
order to verify the nominal operation of the detector
Variations of
count rate as a function of orbital position will be analyzed to find
dependence of dark rate on proximity to the SAA
Dependence of dark
rate as function of time will also be tracked
COS/NUV 11894 NUV Detector Dark Monitor The purpose of this proposal is to measure the NUV detector dark rate
by taking long science exposures with no light on the detector
The
detector dark rate and spatial distribution of counts will be compared
to pre-launch and SMOV data in order to verify the nominal operation
of the detector
Variations of count rate as a function of orbital
position will be analyzed to find dependence of dark rate on proximity
to the SAA
Dependence of dark rate as function of time will also be
tracked
ACS/SBC 11886 UV Contamination Monitor The observations consist of imaging and spectroscopy with SBC and HRC
of the cluster NGC 6681 in order to monitor the temporal evolution of
the UV sensitivity of the SBC and the HRC
WFC3/ACS/UVIS 11877 HST Cycle 17 and Post-SM4 Optical Monitor This program is the Cycle 17 implementation of the HST Optical
Monitoring Program
The 36 orbits comprising this proposal will utilize ACS (Wide Field
Channel) and WFC3 (UVIS Channel) to observe stellar cluster members in
parallel with multiple exposures over an orbit
Phase retrieval
performed on the PSF in each image will be used to measure primarily
focus, with the ability to explore apparent coma, and astigmatism
changes in WFC3
The goals of this program are to: 1) monitor the overall OTA focal
length for the purposes of maintaining focus within science tolerances
2) gain experience with the relative effectiveness of phase retrieval
on WFC3/UVIS PSFs 3) determine focus offset between the imagers and
identify any SI-specific focus behavior and dependencies If need is determined, future visits will be modified to interleave
WFC3/IR channel and STIS/CCD focii measurements
STIS/CCD 11855 STIS/CCD Spectroscopic Sensitivity Monitor for Cycle 17 Monitor sensitivity of each CCD grating mode to detect any change due
to contamination or other causes
STIS/CC 11847 CCD Bias Monitor-Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns
STIS/CC 11845 CCD Dark Monitor Part 2 Monitor the darks for the STIS CCD
WFC3/UV/ACS/WFC 11739 Multiple Stellar Generations in the Unique Globular Clusters NGC 6388
and NGC 6441 Over the last few years HST observations have resulted in one of the
most exciting and unexpected developments in stellar population
studies: the discovery of multiple generations of stars in several
globular clusters
The finding of multiple main sequences in the
massive clusters NGC 2808 and Omega Centauri, and multiple subgiant
branches in NGC 1851, M54, and NGC 6388 has challenged the long-held
paradigm that globular clusters are simple stellar populations
Even
more surprising, given the spectroscopic and photometric constraints,
the only viable explanation for the main sequence splitting appears to
be Helium enrichment, up to an astonishingly high Y=0
4
The
conditions under which certain globulars experience the formation of
multiple stellar generations remain mysterious, and even more so the
helium-enrichment phenomenon
Such an enrichment has important
implications for chemical-enrichment, star-formation, and
stellar-evolution scenarios, in star clusters and likely elsewhere
To
properly constrain the multiple main sequence phenomenon, it is
important to determine its extent among GCs: is it limited to Omega
Cen and NGC2808, or is it more common? We propose deep WFC3 optical/IR
imaging of NGC 6388 and 6441, the two globular clusters that are most
likely to host multiple, helium-enriched populations
Our simulations
of WFC3 performance suggest that we will be able to detect even the
main sequence splittings caused by small He differences (Delta Y
<0
03)
WFC3/UVIS 11732 The Temperature Profiles of Quasar Accretion Disks We can now routinely measure the size of quasar accretion disks using
gravitational microlensing of lensed quasars
At optical wavelengths
we observe a size and scaling with black hole mass roughly consistent
with thin disk theory but the sizes are larger than expected from the
observed optical fluxes
One solution would be to use a flatter
temperature profile, which we can study by measuring the wavelength
dependence of the disk size over the largest possible wavelength
baseline
Thus, to understand the size discrepancy and to probe closer
to the inner edge of the disk we need to extend our measurements to UV
wavelengths, and this can only be done with HST
For example, in the
UV we should see significant changes in the optical/UV size ratio with
black hole mass
We propose monitoring 5 lenses spanning a broad range
of black hole masses with well-sampled ground based light curves,
optical disk size measurements and known GALEX UV fluxes during Cycles
17 and 18 to expand from our current sample of two lenses
We would
obtain 5 observations of each target in each Cycle, similar to our
successful strategy for the first two targets
WFC3/UV/ACS/WFC 11710 The Extreme Globular Cluster System of Abell 1689: The Ultimate Test
of Universal Formation Efficiency The stellar masses of the most luminous galaxies poorly represent the
masses of the halos in which they reside
However, recent studies of
the very rich globular cluster (GC) populations in the centers of
galaxy clusters point toward an apparently linear scaling of the
number of GCs with the total core mass of the galaxy cluster
Thus,
unlike for the stars in cD galaxies, GC formation in these systems
appears to have proceeded with a roughly universal mass conversion
efficiency
GCs are also distinct in that their spatial distributions
are more extended than the starlight, and recent simulations suggest
that they follow the mass density profile of the merged dark matter
halos that formed stars at high redshift
To provide a definitive test
of the universal efficiency hypothesis requires measuring the number
of GCs in the most massive galaxy clusters, where the number should be
a factor of 5 or more greater than seen in M87
Likewise, the
relationship between GCs and mass density can only be tested in
systems where the total mass and mass density are well-determined
Fortunately, the imaging power of HST brings the GC population of
Abell 1689, the most extreme high-mass lensing cluster, into range
Estimates of the size of the A1689 GC population from available data
suggest an unprecedented 100, 000 GCs, but this number is based on the
tip of the iceberg and is extremely uncertain
We propose to obtain
the first accurate measurement of the number of GCs and their density
profile in this extraordinary system - the most massive and most
distant GC system ever studied - and thus make the ultimate test of
the universal GC formation hypothesis
Our deep I-band image will also
provide a stringent "null-detection" test of several known z>7 galaxy
candidates and improve the mass model of the system by increasing the
number of usable lensed background galaxies
Finally, we will take
deep multi-band parallel observations with WFC3/IR to help in
quantifying the abundance of rare faint red objects
WFC3/IR 11696 Infrared Survey of Star Formation Across Cosmic Time We propose to use the unique power of WFC3 slitless spectroscopy to
measure the evolution of cosmic star formation from the end of the
reionization epoch at z>6 to the close of the galaxy- building era at
z~0
3
Pure parallel observations with the grisms have proven to be
efficient for identifying line emission from galaxies across a broad
range of redshifts
The G102 grism on WFC3 was designed to extend this
capability to search for Ly-alpha emission from the first galaxies
Using up to 250 orbits of pure parallel WFC3 spectroscopy, we will
observe about 40 deep (4-5 orbit) fields with the combination of G102
and G141, and about 20 shallow (2-3 orbit) fields with G141 alone
Our primary science goals at the highest redshifts are: (1) Detect Lya
in ~100 galaxies with z>5
6 and measure the evolution of the Lya
luminosity function, independent of of cosmic variance; 2) Determine
the connection between emission line selected and continuum-break
selected galaxies at these high redshifts, and 3) Search for the
proposed signature of neutral hydrogen absorption at re-ionization
At
intermediate redshifts we will (4) Detect more than 1000 galaxies in
Halpha at 0
5 To identify single-line Lya emitters, we will exploit the wide
0
8--1
9um wavelength coverage of the combined G102+G141 spectra
All
[OII] and [OIII] interlopers detected in G102 will be reliably
separated from true LAEs by the detection of at least one strong line
in the G141 spectrum, without the need for any ancillary data
We
waive all proprietary rights to our data and will make high-level data
products available through the ST/ECF
WFC3/UVIS 11661 The Black Hole Mass - Bulge Luminosity Relationship for the Nearest
Reverberation-Mapped AGNs We propose to obtain WFC3 host galaxy images of the eight nearest AGNs
with masses from reverberation mapping, and one star as a PSF model
These images will allow us to determine with unprecedented accuracy
the bulge luminosities of the host galaxies, a goal which is not
achievable from the ground due to the blurring of the very bright PSF
component under typical, and even very good, seeing conditions
High-resolution ACS images of the host galaxies of more luminous AGNs
reveal that the black hole mass-bulge luminosity and black hole
mass-bulge mass relationships for AGNs are not well constrained and
arise from what appear to be fundamentally flawed data sets
With the
addition of the images proposed here to our current sample of ACS
images, we will be able to extend our determinations of the black hole
mass- bulge luminosity and black hole mass-bulge mass relationships
for AGNs by an order of magnitude and test our preliminary results for
these fundamentally important relationships against those previously
determined for quiescent galaxies
WFC3/UVIS/IR 11644 A Dynamical-Compositional Survey of the Kuiper Belt: A New Window Into
the Formation of the Outer Solar System The eight planets overwhelmingly dominate the solar system by mass,
but their small numbers, coupled with their stochastic pasts, make it
impossible to construct a unique formation history from the dynamical
or compositional characteristics of them alone
In contrast, the huge
numbers of small bodies scattered throughout and even beyond the
planets, while insignificant by mass, provide an almost unlimited
number of probes of the statistical conditions, history, and
interactions in the solar system
To date, attempts to understand the
formation and evolution of the Kuiper Belt have largely been dynamical
simulations where a hypothesized starting condition is evolved under
the gravitational influence of the early giant planets and an attempt
is made to reproduce the current observed populations
With little
compositional information known for the real Kuiper Belt, the test
particles in the simulation are free to have any formation location
and history as long as they end at the correct point
Allowing
compositional information to guide and constrain the formation,
thermal, and collisional histories of these objects would add an
entire new dimension to our understanding of the evolution of the
outer solar system
While ground based compositional studies have hit
their flux limits already with only a few objects sampled, we propose
to exploit the new capabilities of WFC3 to perform the first ever
large-scale dynamical-compositional study of Kuiper Belt Objects
(KBOs) and their progeny to study the chemical, dynamical, and
collisional history of the region of the giant planets
The
sensitivity of the WFC3 observations will allow us to go up to two
magnitudes deeper than our ground based studies, allowing us the
capability of optimally selecting a target list for a large survey
rather than simply taking the few objects that can be measured, as we
have had to do to date
We have carefully constructed a sample of 120
objects which provides both overall breadth, for a general
understanding of these objects, plus a large enough number of objects
in the individual dynamical subclass to allow detailed comparison
between and within these groups
These objects will likely define the
core Kuiper Belt compositional sample for years to come
While we have
many specific results anticipated to come from this survey, as with
any project where the field is rich, our current knowledge level is
low, and a new instrument suddenly appears which can exploit vastly
larger segments of the population, the potential for discovery -- both
anticipated and not -- is extraordinary
WFC3/UVI 11615 Hunting for Optical Companions to Binary MSPs in Globular Clusters Here we present a proposal which exploits the re-newed potential of
HST after the Service Mission 4 for probing the population of binary
Millisecond Pulsars (MSPs) in Globular Clusters
In particular we
intend to: (1) extend the search for optical counterparts in Terzan 5,
by pushing the performance of the WFC3 IR channel to sample the entire
MS extension down to M=0
1 Mo; (2) perform a deep multi-band search of
MSP companions with the WFC3, in 3 clusters (namely NGC6440, M28 and
M5), where recent radio observations have found particularly
interesting objects; (3) derive an accurate radial velocity (with
STIS) of the puzzling optical companion COM6266B recently discovered
by our group, to firmly assess its cluster membership
This program is
the result of a large collaboration among the three major groups (lead
by Freire, Ransom and Possenti) which are performing extensive MSP
search in GCs in the radio bands, and our group which has a large
experience in performing accurate stellar photometry in crowded
environments
This collaboration has produced a number of outstanding
discoveries
In fact, three of the 6 optical counterparts to binary
MSP companions known to date in GCs have been discovered by our group
The observations here proposed would easily double/triple the existing
sample of known MSP companions, allowing the first meaningful approach
to the study of the formation, evolution and recycling process of
pulsar in GCs
Moreover, since most of binary MSPs in GCs are thought
to form via stellar interactions in the high density core regions, the
determination of the nature of the companion and the incidence of this
collisionally-induced population has a significant impact on our
knowledge of the cluster dynamics
Even more interesting, the study of
the optical companions to NSs in GCs allows one to derive tighter
constraints (than those obtainable for NS binaries in the Galactic
field) on the system properties
This has, in turn, an intrisic
importance for fundamental physics, since it offers the opportunity of
measuring the mass of the NS and hence constraining the equation of
state of matter at the nuclear equilibrium density
WFC3/UV 11605 Obtaining the Missing Links in the Test of Very Low Mass Evolutionary
Models with HST We are proposing for spatially resolved ACS+HRC observations of 11
very low mass binaries spanning late-M, L and T spectral types in
order to obtain precise effective temperature measurements for each
component
All of our targets are part of a program in which we are
measuring dynamical masses of very low-mass binaries to an
unprecedented precision of 10% (or better)
However, without precise
temperature measurements, the full scientific value of these mass
measurements cannot be realized
Together, mass and temperature
measurements will allow us to distinguish between brown dwarf
evolutionary models that make different assumptions about the interior
and atmospheric structure of these ultra-cool objects
While dynamical
masses can be obtained from the ground in the near-IR, obtaining
precise temperatures require access to optical data which, for these
sub-arcsecond binaries, can only be obtained from space with Hubble
WFC3/ACS/UVIS 11603 A Comprehensive Study of Dust Formation in Type II Supernovae with
HST, Spitzer, and Gemini The recent discovery of three extremely bright Type II SNe, (2007it,
2007oc, 2007od) gives us a unique opportunity to combine observations
with HST, Spitzer, and Gemini to study the little understood dust
formation process in Type II Sne
Priority 1 Spitzer Cycle 5 and band
1 Gemini 2008A time has already been approved for this project
Since
late-time Type II Sne are faint and tend to be in crowded fields, we
need the high sensitivity and high spatial resolution of ACS and
NICMOS/NIC2 for these observations
This project is motivated by the
recent detection of large amounts of dust in high redshift galaxies
The dust in these high-z galaxies must come from young, massive stars
so Type II Sne could be potential sources
The mechanism and the
efficiency of dust condensation in Type II SN ejecta are not well
understood, largely due to the lack of observational data
We plan to
produce a unique dataset, combining spectroscopy and imaging in the
visible, near- and mid-IR covering the key phase, 400-700 days after
maximum when dust is known to form in the SN ejecta
Therefore, we are
proposing for coordinated HST/NOAO observations (HST ACS, NICMOS/NIC2
& Gemini/GMOS and TReCS) which will be combined with our Spitzer Cycle
5 data to study these new bright Sne
The results of this program will
place strong constraints on the formation of dust seen in young high
redshift (z>5) galaxies
COS/NUV/FUV 11598 How Galaxies Acquire their Gas: A Map of Multiphase Accretion and
Feedback in Gaseous Galaxy Halos We propose to address two of the biggest open questions in galaxy
formation - how galaxies acquire their gas and how they return it to
the IGM - with a concentrated COS survey of diffuse multiphase gas in
the halos of SDSS galaxies at z = 0
15 - 0
35
Our chief science goal
is to establish a basic set of observational facts about the physical
state, metallicity, and kinematics of halo gas, including the sky
covering fraction of hot and cold material, the metallicity of infall
and outflow, and correlations with galaxy stellar mass, type, and
color - all as a function of impact parameter from 10 - 150 kpc
Theory suggests that the bimodality of galaxy colors, the shape of the
luminosity function, and the mass-metallicity relation are all
influenced at a fundamental level by accretion and feedback, yet these
gas processes are poorly understood and cannot be predicted robustly
from first principles
We lack even a basic observational assessment
of the multiphase gaseous content of galaxy halos on 100 kpc scales,
and we do not know how these processes vary with galaxy properties
This ignorance is presently one of the key impediments to
understanding galaxy formation in general
We propose to use the
high-resolution gratings G130M and G160M on the Cosmic Origins
Spectrograph to obtain sensitive column density measurements of a
comprehensive suite of multiphase ions in the spectra of 43 z < 1 QSOs
lying behind 43 galaxies selected from the Sloan Digital Sky Survey
In aggregate, these sightlines will constitute a statistically sound
map of the physical state and metallicity of gaseous halos, and
subsets of the data with cuts on galaxy mass, color, and SFR will seek
out predicted variations of gas properties with galaxy properties
Our
interpretation of these data will be aided by state-of-the-art
hydrodynamic simulations of accretion and feedback, in turn providing
information to refine and test such models
We will also use Keck,
MMT, and Magellan (as needed) to obtain optical spectra of the QSOs to
measure cold gas with Mg II, and optical spectra of the galaxies to
measure SFRs and to look for outflows
In addition to our other
science goals, these observations will help place the Milky Way's
population of multiphase, accreting High Velocity Clouds (HVCs) into a
global context by identifying analogous structures around other
galaxies
Our program is designed to make optimal use of the unique
capabilities of COS to address our science goals and also generate a
rich dataset of other absorption-line systems
WFC3/ACS/IR 11597 Spectroscopy of IR-Selected Galaxy Clusters at 1 < z < 1
5 We propose to obtain WFC3 G141 and G102 slitless spectroscopy of
galaxy clusters at 1 < z < 1
5 that were selected from the IRAC survey
of the Bootes NDWFS field
Our IRAC survey contains the largest sample
of spectroscopically confirmed clusters at z > 1
The WFC3 grism data
will measure H-alpha to determine SFR, and fit models to the low
resolution continua to determine stellar population histories for the
brighter cluster members, and redshifts for the red galaxies too faint
for ground-based optical spectroscopy
ACS/WFC3 11586 Exceptional Galactic Halo Globular Clusters and the Second Parameter We propose to obtain deep ACS-WFC images of six globular clusters
(five of which have no previous HST photometry) that reside in the
Galactic halo, where the second parameter effect is most pronounced
These globular clusters are among the least studied in the Galaxy and
yet, from the perspective of the second parameter phenomenon, the most
intriguing
With the best available CMDs only reaching the vicinity of the main
sequence turn off at present, the unique sensitivity and resolution of
ACS-WFC will yield ages of unprecedented precision for these clusters
These data will provide us with new insight into the stellar
populations present in the outer Galactic halo and the nature of the
second parameter
The second parameter plays a critical role in our
understanding of the formation and evolution of the Galaxy and the
proposed observations will shed new light on this problem and these
exceptional clusters
ACS/WFC 11582 The Spatial Distribution of Radiation in the Complex ISM of Distant
Ultraluminous Galaxies A significant fraction of energy emitted by galaxies at redshifts when
their stars were forming most vigorously, and when their blackholes
were growing most powerfully emerges at far-infrared (IR) wavelengths
The fraction of this energy generated by the most extreme and luminous
objects is also much larger than the equivalent fraction at optical
wavelengths
Many of the most luminous far-IR sources have been
located precisely and unambiguously using deep radio, Spitzer and
optical observations, and have spectroscopic identifications using the
largest ground-based telescopes
Surprisingly, however, the spectra of
most of these heavily dust-enshrouded galaxies show prominent
Lyman-alpha emission
We propose to observe five of the brightest
examples at z~2-3 in re-activated ACS ramp filters, to resolve the
spatial distribution of this line emission on fine kpc scales, in
order to contrast and compare with the underlying ultraviolet (UV)
continuum
Precise spectroscopic redshifts and the unique rest-UV
resolution of HST are both essential to reveal the escape and
generation of Lyman-alpha photons in the dusty ISM of these extreme
galaxies
There is no other way to trace the detailed spatial
distirbution of the most excited gas in a galactic wind, along with
emission from less-massive star-forming galaxies in associated groups
The targets have available HST-resolution ground-based near-IR AO
imaging and arcsec-scale images in CO from ground-based mm-wave
interferometers, which provide context for spatial structure of
evolved stars and the ISM
The interplay between restframe UV emission
and the ISM in these galaxies has important consequences for
understanding the origin of the prodigous luminosity of these systems,
and for future observations with JWST and ALMA
ACS/SBC/COS/NUV/FUV 11579 The Difference Between Neutral- and Ionized-Gas Metal Abundances in
Local Star-Forming Galaxies with COS The metallicity of galaxies and its evolution with redshift is of
paramount importance for understanding galaxy formation
Abundances in
the interstellar medium (ISM) are typically determined using
emission-line spectroscopy of HII regions
However, since HII regions
are associated with recent SF they may not have abundances typical for
the galaxy as a whole
This is true in particular for star-forming
galaxies (SFGs), in which the bulk of the metals may be contained in
the neutral gas
It is therefore important to directly probe the metal
abundances in the neutral gas
This can be done using absorption lines
in the Far UV
We have developed techniques to do this in SFGs, where
the absorption is measured for sightlines toward bright SF regions
within the galaxy itself
We have successfully applied this technique
to a sample of galaxies observed with FUSE
The results have been very
promising, suggesting in I Zw 18 that abundances in the neutral gas
may be up to 0
5 dex lower than in the ionized gas
However, the
interpretation of the FUSE data is complicated by the very large FUSE
aperture (30 arcsec), the modest S/N, and the limited selection of
species available in the FUSE bandpass
The advent of COS on HST now
allows a significant advance in all of these areas
We will therefore
obtain absorption line spectroscopy with G130M in the same sample for
which we already have crude constraints from FUSE
We will obtain
ACS/SBC images to select the few optimal sightlines to target in each
galaxy
The results will be interpreted through line-profile fitting
to determine the metal abundances constrained by the available lines
The results will provide important new insights into the metallicities
of galaxies, and into outstanding problems at high redshift such as
the observed offset between the metallicities of Lyman Break Galaxies
and Damped Lyman Alpha systems
WFC3/UV 11556 Investigations of the Pluto System We propose a set of high SNR observations of the Pluto system that
will provide improved lightcurves, orbits, and photometric properties
of Nix and Hydra
The key photometric result for Nix and Hydra will be
a vastly improved lightcurve shape and rotation period to test if the
objects are in synchronous rotation or not
A second goal of this
program will be to retrieve a new epoch of albedo map for the surface
of Pluto
These observations will also improve masses and in some case
densities for the bodies in the Pluto system
WFC3/ACS/UVIS 11360 Star Formation in Nearby Galaxies Star formation is a fundamental astrophysical process; it controls
phenomena ranging from the evolution of galaxies and nucleosynthesis
to the origins of planetary systems and abodes for life
The WFC3,
optimized at both UV and IR wavelengths and equipped with an extensive
array of narrow-band filters, brings unique capabilities to this area
of study
The WFC3 Scientific Oversight Committee (SOC) proposes an
integrated program on star formation in the nearby universe which will
fully exploit these new abilities
Our targets range from the
well-resolved R136 in 30 Dor in the LMC (the nearest super star
cluster) and M82 (the nearest starbursting galaxy) to about half a
dozen other nearby galaxies that sample a wide range of star-formation
rates and environments
Our program consists of broad band
multiwavelength imaging over the entire range from the UV to the
near-IR, aimed at studying the ages and metallicities of stellar
populations, revealing young stars that are still hidden by dust at
optical wavelengths, and showing the integrated properties of star
clusters
Narrow-band imaging of the same environments will allow us
to measure star-formation rates, gas pressure, chemical abundances,
extinction, and shock morphologies
The primary scientific issues to
be addressed are: (1) What triggers star formation? (2) How do the
properties of star-forming regions vary among different types of
galaxies and environments of different gas densities and compositions?
(3) How do these different environments affect the history of star
formation? (4) Is the stellar initial mass function universal or
determined by local conditions? ==============================================================================
TOPIC: Daily Report #5132 == 1 of 1 ==
Date: Wed, Jul 7 2010 9:00 am
From: "Cooper, Joe" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5132 PERIOD COVERED: 5am July 6 - 5am July 7, 2010 (DOY 187/09:00z-188/09:00z) FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: (None) COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 3 3
FGS REAcq 11 11
OBAD with Maneuver 3 3 SIGNIFICANT EVENTS: (None) OBSERVATIONS SCHEDULED: COS/NUV/ACS/WFC/FUV 11658 Probing the Outer Regions of M31 with QSO Absorption Lines We propose HST-COS spectroscopy of 10 quasars behind M31
Absorption
lines due to MgII, FeII, CIV, and a variety of other lines will be
searched for and measured
Six quasars lie between 1 and 4
2 Holmberg
radii near the major axis on the southwest side, where confusion with
Milky Way gas is minimized
Two lie even farther out on the southwest
side of the major axis
One lies within 1 Holmberg radius
Two of the
10 pass through M31's high velocity clouds seen in a detailed 21 cm
emission map
Exposure time estimates were based on SDSS magnitudes
and available GALEX magnitudes
Thus, using the most well-studied
external spiral galaxy in the sky, our observations will permit us to
check, better than ever before, the standard picture that quasar
metal-line absorption systems such as MgII and CIV arise in an
extended gaseous halo/disk of a galaxy well beyond its observable
optical radius
The observations will yield insights into the nature
of the gas and its connection to the very extended stellar components
of M31 that have recently been studied
Notably the observations have
the potential of extending M31's rotation curve to very large
galactocentric distances, thereby placing new constrants on M31's dark
matter halo
Finally, we also request that the coordinated parallel orbits be
allocated to this program so that we may image the resolved stellar
content of M31's halo and outer disk
STIS/CC 11845 CCD Dark Monitor Part 2 Monitor the darks for the STIS CCD
STIS/CC 11847 CCD Bias Monitor-Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns
WFC3/ACS/IR 11235 HST NICMOS Survey of the Nuclear Regions of Luminous Infrared Galaxies
in the Local Universe At luminosities above 10^11
4 L_sun, the space density of far-infrared
selected galaxies exceeds that of optically selected galaxies
These
`luminous infrared galaxies' (LIRGs) are primarily interacting or
merging disk galaxies undergoing enhanced star formation and Active
Galactic Nuclei (AGN) activity, possibly triggered as the objects
transform into massive S0 and elliptical merger remnants
We propose
NICMOS NIC2 imaging of the nuclear regions of a complete sample of 88
L_IR > 10^11
4 L_sun luminous infrared galaxies in the IRAS Revised
Bright Galaxy Sample (RBGS: i
e
, 60 micron flux density > 5
24 Jy)
This sample is ideal not only in its completeness and sample size, but
also in the proximity and brightness of the galaxies
The superb
sensitivity and resolution of NICMOS NIC2 on HST enables a unique
opportunity to study the detailed structure of the nuclear regions,
where dust obscuration may mask star clusters, AGN, and additional
nuclei from optical view, with a resolution significantly higher than
possible with Spitzer IRAC
This survey thus provides a crucial
component to our study of the dynamics and evolution of IR galaxies
presently underway with Wide-Field, HST ACS/WFC3, and Spitzer IRAC
observations of these 88 galaxies
Imaging will be done with the F160W
filter (H-band) to examine as a function of both luminosity and merger
stage: (i) the luminosity and distribution of embedded star clusters,
(ii) the presence of optically obscured AGN and nuclei, (iii) the
correlation between the distribution of 1
6 micron emission and the
mid-IR emission as detected by Spitzer IRAC, (iv) the evidence of bars
or bridges that may funnel fuel into the nuclear region, and (v) the
ages of star clusters for which photometry is available via ACS/WFC3
observations
The NICMOS data, combined with the HST ACS, Spitzer, and
GALEX observations of this sample, will result in the most
comprehensive study of merging and interacting galaxies to date
WFC3/ACS/UVIS 11360 Star Formation in Nearby Galaxies Star formation is a fundamental astrophysical process; it controls
phenomena ranging from the evolution of galaxies and nucleosynthesis
to the origins of planetary systems and abodes for life
The WFC3,
optimized at both UV and IR wavelengths and equipped with an extensive
array of narrow-band filters, brings unique capabilities to this area
of study
The WFC3 Scientific Oversight Committee (SOC) proposes an
integrated program on star formation in the nearby universe which will
fully exploit these new abilities
Our targets range from the
well-resolved R136 in 30 Dor in the LMC (the nearest super star
cluster) and M82 (the nearest starbursting galaxy) to about half a
dozen other nearby galaxies that sample a wide range of star-formation
rates and environments
Our program consists of broad band
multiwavelength imaging over the entire range from the UV to the
near-IR, aimed at studying the ages and metallicities of stellar
populations, revealing young stars that are still hidden by dust at
optical wavelengths, and showing the integrated properties of star
clusters
Narrow-band imaging of the same environments will allow us
to measure star-formation rates, gas pressure, chemical abundances,
extinction, and shock morphologies
The primary scientific issues to
be addressed are: (1) What triggers star formation? (2) How do the
properties of star-forming regions vary among different types of
galaxies and environments of different gas densities and compositions?
(3) How do these different environments affect the history of star
formation? (4) Is the stellar initial mass function universal or
determined by local conditions? WFC3/IR/S/C 11929 IR Dark Current Monitor Analyses of ground test data showed that dark current signals are more
reliably removed from science data using darks taken with the same
exposure sequences as the science data, than with a single dark
current image scaled by desired exposure time
Therefore, dark current
images must be collected using all sample sequences that will be used
in science observations
These observations will be used to monitor
changes in the dark current of the WFC3-IR channel on a day-to-day
basis, and to build calibration dark current ramps for each of the
sample sequences to be used by Gos in Cycle 17
For each sample
sequence/array size combination, a median ramp will be created and
delivered to the calibration database system (CDBS)
WFC3/UV 11556 Investigations of the Pluto System We propose a set of high SNR observations of the Pluto system that
will provide improved lightcurves, orbits, and photometric properties
of Nix and Hydra
The key photometric result for Nix and Hydra will be
a vastly improved lightcurve shape and rotation period to test if the
objects are in synchronous rotation or not
A second goal of this
program will be to retrieve a new epoch of albedo map for the surface
of Pluto
These observations will also improve masses and in some case
densities for the bodies in the Pluto system
WFC3/UV/ACS/WFC 11710 The Extreme Globular Cluster System of Abell 1689: The Ultimate Test
of Universal Formation Efficiency The stellar masses of the most luminous galaxies poorly represent the
masses of the halos in which they reside
However, recent studies of
the very rich globular cluster (GC) populations in the centers of
galaxy clusters point toward an apparently linear scaling of the
number of GCs with the total core mass of the galaxy cluster
Thus,
unlike for the stars in cD galaxies, GC formation in these systems
appears to have proceeded with a roughly universal mass conversion
efficiency
GCs are also distinct in that their spatial distributions
are more extended than the starlight, and recent simulations suggest
that they follow the mass density profile of the merged dark matter
halos that formed stars at high redshift
To provide a definitive test
of the universal efficiency hypothesis requires measuring the number
of GCs in the most massive galaxy clusters, where the number should be
a factor of 5 or more greater than seen in M87
Likewise, the
relationship between GCs and mass density can only be tested in
systems where the total mass and mass density are well-determined
Fortunately, the imaging power of HST brings the GC population of
Abell 1689, the most extreme high-mass lensing cluster, into range
Estimates of the size of the A1689 GC population from available data
suggest an unprecedented 100, 000 GCs, but this number is based on the
tip of the iceberg and is extremely uncertain
We propose to obtain
the first accurate measurement of the number of GCs and their density
profile in this extraordinary system - the most massive and most
distant GC system ever studied - and thus make the ultimate test of
the universal GC formation hypothesis
Our deep I-band image will also
provide a stringent "null-detection" test of several known z>7 galaxy
candidates and improve the mass model of the system by increasing the
number of usable lensed background galaxies
Finally, we will take
deep multi-band parallel observations with WFC3/IR to help in
quantifying the abundance of rare faint red objects
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
WFC3/UVIS 11908 Cycle 17: UVIS Bowtie Monitor Ground testing revealed an intermittent hysteresis type effect in the
UVIS detector (both CCDs) at the level of ~1%, lasting hours to days
Initially found via an unexpected bowtie-shaped feature in flatfield
ratios, subsequent lab tests on similar e2v devices have since shown
that it is also present as simply an overall offset across the entire
CCD, i
e
, a QE offset without any discernable pattern
These lab
tests have further revealed that overexposing the detector to count
levels several times full well fills the traps and effectively
neutralizes the bowtie
Each visit in this proposal acquires a set of
three 3x3 binned internal flatfields: the first unsaturated image will
be used to detect any bowtie, the second, highly exposed image will
neutralize the bowtie if it is present, and the final image will allow
for verification that the bowtie is gone
==============================================================================
TOPIC: Daily Report #5133 == 1 of 1 ==
Date: Thurs, Jul 8 2010 7:27 am
From: "Cooper, Joe" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5133 PERIOD COVERED: 5am July 7 - 5am July 8, 2010 (DOY 188/09:00z-189/09:00z) FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: (None) COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 5 5
FGS REAcq 9 9
OBAD with Maneuver 4 4 SIGNIFICANT EVENTS: (None) OBSERVATIONS SCHEDULED: ACS/WFC 11996 CCD Daily Monitor (Part 3) This program comprises basic tests for measuring the read noise and
dark current of the ACS WFC and for tracking the growth of hot pixels
The recorded frames are used to create bias and dark reference images
for science data reduction and calibration
This program will be
executed four days per week (Mon, Wed, Fri, Sun) for the duration of
Cycle 17
To facilitate scheduling, this program is split into three
proposals
This proposal covers 308 orbits (19
25 weeks) from 21 June
2010 to 1 November 2010
COS/FUV 11686 The Cosmological Impact of AGN Outflows: Measuring Absolute Abundances
and Kinetic Luminosities AGN outflows are increasingly invoked as a major contributor to the
formation and evolution of supermassive black holes, their host
galaxies, the surrounding IGM, and cluster cooling flows
Our HST/COS
proposal will determine reliable absolute chemical abundances in six
AGN outflows, which influences several of the processes mentioned
above
To date there is only one such determination, done by our team
on Mrk 279 using 16 HST/STIS orbits and 100 ksec of FUSE time
The
advent of COS and its high sensitivity allows us to choose among
fainter objects at redshifts high enough to preclude the need for
FUSE
This will allow us to determine the absolute abundances for six
AGN (all fainter than Mrk 279) using only 40 HST COS orbits
This will
put abundances studies in AGN on a firm footing, an elusive goal for
the past four decades
In addition, prior FUSE observations of four of
these targets indicate that it is probable that the COS observations
will detect troughs from excited levels of C III
These will allow us
to measure the distances of the outflows and thereby determine their
kinetic luminosity, a major goal in AGN feedback research
We will use our state of the art column density extraction methods and
velocity-dependent photoionization models to determine the abundances
and kinetic luminosity
Previous AGN outflow projects suffered from
the constraints of deciding what science we could do using ONE of the
handful of bright targets that were observable
With COS we can choose
the best sample for our experiment
As an added bonus, most of the
spectral range of our targets has not been observed previously,
greatly increasing the discovery phase space
COS/NUV/ACS/WFC/FUV 11658 Probing the Outer Regions of M31 with QSO Absorption Lines We propose HST-COS spectroscopy of 10 quasars behind M31
Absorption
lines due to MgII, FeII, CIV, and a variety of other lines will be
searched for and measured
Six quasars lie between 1 and 4
2 Holmberg
radii near the major axis on the southwest side, where confusion with
Milky Way gas is minimized
Two lie even farther out on the southwest
side of the major axis
One lies within 1 Holmberg radius
Two of the
10 pass through M31's high velocity clouds seen in a detailed 21 cm
emission map
Exposure time estimates were based on SDSS magnitudes
and available GALEX magnitudes
Thus, using the most well-studied
external spiral galaxy in the sky, our observations will permit us to
check, better than ever before, the standard picture that quasar
metal-line absorption systems such as MgII and CIV arise in an
extended gaseous halo/disk of a galaxy well beyond its observable
optical radius
The observations will yield insights into the nature
of the gas and its connection to the very extended stellar components
of M31 that have recently been studied
Notably the observations have
the potential of extending M31's rotation curve to very large
galactocentric distances, thereby placing new constraints on M31's
dark matter halo
Finally, we also request that the coordinated parallel orbits be
allocated to this program so that we may image the resolved stellar
content of M31's halo and outer disk
STIS/CC 11845 CCD Dark Monitor Part 2 Monitor the darks for the STIS CCD
STIS/CC 11847 CCD Bias Monitor-Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1,
and 1x1 at gain = 4, to build up high-S/N superbiases and track the
evolution of hot columns
WFC3/IR/S/C 11929 IR Dark Current Monitor Analyses of ground test data showed that dark current signals are more
reliably removed from science data using darks taken with the same
exposure sequences as the science data, than with a single dark
current image scaled by desired exposure time
Therefore, dark current
images must be collected using all sample sequences that will be used
in science observations
These observations will be used to monitor
changes in the dark current of the WFC3-IR channel on a day-to-day
basis, and to build calibration dark current ramps for each of the
sample sequences to be used by Gos in Cycle 17
For each sample
sequence/array size combination, a median ramp will be created and
delivered to the calibration database system (CDBS)
WFC3/UV/ACS/WFC 11710 The Extreme Globular Cluster System of Abell 1689: The Ultimate Test
of Universal Formation Efficiency The stellar masses of the most luminous galaxies poorly represent the
masses of the halos in which they reside
However, recent studies of
the very rich globular cluster (GC) populations in the centers of
galaxy clusters point toward an apparently linear scaling of the
number of GCs with the total core mass of the galaxy cluster
Thus,
unlike for the stars in cD galaxies, GC formation in these systems
appears to have proceeded with a roughly universal mass conversion
efficiency
GCs are also distinct in that their spatial distributions
are more extended than the starlight, and recent simulations suggest
that they follow the mass density profile of the merged dark matter
halos that formed stars at high redshift
To provide a definitive test
of the universal efficiency hypothesis requires measuring the number
of GCs in the most massive galaxy clusters, where the number should be
a factor of 5 or more greater than seen in M87
Likewise, the
relationship between GCs and mass density can only be tested in
systems where the total mass and mass density are well-determined
Fortunately, the imaging power of HST brings the GC population of
Abell 1689, the most extreme high-mass lensing cluster, into range
Estimates of the size of the A1689 GC population from available data
suggest an unprecedented 100, 000 GCs, but this number is based on the
tip of the iceberg and is extremely uncertain
We propose to obtain
the first accurate measurement of the number of GCs and their density
profile in this extraordinary system - the most massive and most
distant GC system ever studied - and thus make the ultimate test of
the universal GC formation hypothesis
Our deep I-band image will also
provide a stringent "null-detection" test of several known z>7 galaxy
candidates and improve the mass model of the system by increasing the
number of usable lensed background galaxies
Finally, we will take
deep multi-band parallel observations with WFC3/IR to help in
quantifying the abundance of rare faint red objects
WFC3/UVIS 11905 WFC3 UVIS CCD Daily Monitor The behavior of the WFC3 UVIS CCD will be monitored daily with a set
of full-frame, four-amp bias and dark frames
A smaller set of 2Kx4K
subarray biases are acquired at less frequent intervals throughout the
cycle to support subarray science observations
The internals from
this proposal, along with those from the anneal procedure (Proposal
11909), will be used to generate the necessary superbias and superdark
reference files for the calibration pipeline (CDBS)
WFC3/UVIS 11908 Cycle 17: UVIS Bowtie Monitor Ground testing revealed an intermittent hysteresis type effect in the
UVIS detector (both CCDs) at the level of ~1%, lasting hours to days
Initially found via an unexpected bowtie-shaped feature in flatfield
ratios, subsequent lab tests on similar e2v devices have since shown
that it is also present as simply an overall offset across the entire
CCD, i
e
, a QE offset without any discernable pattern
These lab
tests have further revealed that overexposing the detector to count
levels several times full well fills the traps and effectively
neutralizes the bowtie
Each visit in this proposal acquires a set of
three 3x3 binned internal flatfields: the first unsaturated image will
be used to detect any bowtie, the second, highly exposed image will
neutralize the bowtie if it is present, and the final image will allow
for verification that the bowtie is gone
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