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============================================================================== TOPIC: Daily Report #5003
== 1 of 1 == Date: Thurs, Dec 31 2009 11:32Â am From: "Bassford, Lynn"
HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science
DAILY REPORT #5003
PERIOD COVERED: 5am December 30 - 5am December 31, 2009 (DOY 364/10:00z-365/10:00z)
OBSERVATIONS SCHEDULED
ACS/WFC3 11879
CCD Daily Monitor (Part 1)
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 352 orbits (22 weeks) from 31 August 2009 to 31 January 2010
COS/NUV/FUV 11741
Probing Warm-Hot Intergalactic Gas at 0 5 < z < 1 3 with a Blind Survey for O VI, Ne VIII, Mg X, and Si XII Absorption Systems
Currently we can only account for half of the baryons (or less) expected to be found in the nearby universe based on D/H and CMB observations This "missing baryons problem" is one of the highest-priority challenges in observational extragalatic astronomy Cosmological simulations suggest that the baryons are hidden in low-density, shock-heated intergalactic gas in the log T = 5 - 7 range, but intensive UV and X-ray surveys using O VI, O VII, and O VIII absorption lines have not yet confirmed this prediction We propose to use COS to carry out a sensitive survey for Ne VIII and Mg X absorption in the spectra of nine QSOs at z(QSO) > 0 89 For the three highest-redshift QSOs, we will also search for Si XII This survey will provide more robust constraints on the quantity of baryons in warm-hot intergalactic gas at 0 5 < z < 1 3, and the data will provide rich constraints on the metal enrichment, physical conditions, and nature of a wide variety of QSO absorbers in addition to the warm-hot systems By comparing the results to other surveys at lower redshifts (with STIS, FUSE, and from the COS GTO programs), the project will also enable the first study of how these absorbers evolve with redshift at z < 1 By combining the program with follow-up galaxy redshift surveys, we will also push the study of galaxy-absorber relationships to higher redshifts, with an emphasis on the distribution of the WHIM with respect to the large-scale matter distribution of the universe
STIS/CCD 11703
The Nature of the Black Hole in a NGC 4472 Globular Cluster and the Origin of Its Broad [OIII] Emission
We propose to use STIS to obtain optical spectroscopy at high spatial resolution of the black hole-hosting globular cluster RZ2109 in the Virgo elliptical NGC 4472 This is motivated by our very recent discovery broad [OIII] 4959, 5007 emission with a width of several thousand km/s in this globular cluster The STIS spectroscopy will enable us to determine if the very broad [OIII] emission is due to material driven at high velocity from the central accreting black hole across the globular cluster, or if the velocity widths are due to gravitational motions very close to the central black hole In the former case, the [OIII] emission should extend over a few-tenths of an arcsecond and be spatially resolved by HST and STIS, while in the latter case, the emission lines will be unresolved Distinguishing between these two possibilities will allow us to - 1) determine whether the black hole is of intermediate mass or a stellar mass, and thereby whether the black hole mass - sigma relation extends to globular cluster masses, 2) test models of black hole formation and evolution in dense stellar systems, and 3) address the nature of accretion in the high luminosity black-hole X-ray source, and constrain the feedback processes from luminous black holes into their surrounding medium in dense stellar systems
STIS/CCD 11844
CCD Dark Monitor Part 1
The purpose of this proposal is to monitor the darks for the STIS CCD
STIS/CCD 11846
CCD Bias Monitor-Part 1
The purpose of this proposal is to 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 11584
Resolving the Smallest Galaxies with ACS
An order of magnitude more dwarf galaxies are expected to inhabit the Local Group, based on currently accepted galaxy formation models, than have been observed This discrepancy has been noted in environments ranging from the field to rich clusters, with evidence emerging that lower density regions contain fewer dwarfs per giant than higher density regions, in further contrast to model predictions However, there is no complete census of the faintest dwarf galaxies in any environment The discovery of the smallest and faintest dwarfs is hampered by the limitations in detecting such compact or low surface brightness galaxies, and this is compounded by the great difficulty in determining accurate distances to, or ascertaining group membership for, such faint objects The M81 group provides a powerful means for establishing membership for faint galaxies in a low density region With a distance modulus of 27 8, the tip of the red giant branch (TRGB) appears at I ~ 24, just within the reach of ground based surveys We have completed a 65 square degree survey in the region around M81 with the CFHT/MegaCam Half of our survey was completed before Cycle 16 and we were awarded time with WFPC2 to observe 15 new candidate dwarf galaxy group members in F606W and F814W bands in order to construct color-magnitude diagrams from which to measure accurate TRGB distances and determine star formation and metallicity histories The data obtained show that 8 - 9 of these objects are galaxies at the same distance as M81 In completing our survey, we have discovered an additional 8 candidate galaxies we propose to image with ACS in order to measure TRGB distances and establish membership We also wish to re-observe our smallest candidate group member and a tidal dwarf candidate with deeper observations made possible with ACS Once membership has been established for this second set of candidates, we will have a complete census of the dwarf galaxy population in the M8 group to M_r ~ -10, allowing us to obtain a firm measurement of the luminosity function faint-end slope, and, combined with previous HST data, to provide a complete inventory of the age and abundance properties for the collapsed core of the M81 group
WFC3/IR 11108
Near Infrared Observations of a Sample of z~6 5-6 7 Galaxies
The majority of the most distant galaxies discovered to date have been found by strong Lyman alpha emission at red optical wavelengths An accurate estimate of the star formation rates for these objects requires a measurement of the line-free UV continuum, which must be taken at infrared wavelengths Here we propose to obtain imaging with WFC3 in the F140W filter for a sample of 9 Lyman alpha galaxies with redshifts z~6 5 up to z=6 740 from a complete, flux-limited widefield narrowband and multi-color survey conducted on the 8-m Subaru Telescope This program will investigate galaxy morphologies and star formation for a uniform sample of the highest redshift galaxies now known
WFC3/IR 11666
Chilly Pairs: A Search for the Latest-type Brown Dwarf Binaries and the Prototype Y Dwarf
We propose to use HST/NICMOS to image a sample of 27 of the nearest (< 20 pc) and lowest luminosity T-type brown dwarfs in order to identify and characterize new very low mass binary systems Only 3 late-type T dwarf binaries have been found to date, despite that fact that these systems are critical benchmarks for evolutionary and atmospheric models at the lowest masses They are also the most likely systems to harbor Y dwarf companions, an as yet unpopulated putative class of very cold (T < 600 K) brown dwarfs Our proposed program will more than double the number of T5-T9 dwarfs imaged at high resolution, with an anticipated yield of ~5 new binaries with initial characterization of component spectral types We will be able to probe separations sufficient to identify systems suitable for astrometric orbit and dynamical mass measurements We also expect one of our discoveries to contain the first Y-type brown dwarf Our proposed program complements and augments ongoing ground-based adaptive optics surveys and provides pathway science for JWST
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 11565 A Search for Astrometric Companions to Very Low-Mass, Population II
Stars We propose to carry out a Snapshot search for astrometric companions
in a subsample of very low-mass, halo subdwarfs identified within 120
parsecs of the Sun
These ultra-cool M subdwarfs are local
representatives of the lowest-mass H burning objects from the Galactic
Population II
The expected 3-4 astrometric doubles that will be
discovered will be invaluable in that they will be the first systems
from which gravitational masses of metal-poor stars at the bottom of
the main sequence can be directly measured
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 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 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 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
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 8 8
FGS REAcq 5 5
OBAD with Maneuver 5 5 SIGNIFICANT EVENTS: (None) ==============================================================================
TOPIC: Daily Report #5004 == 1 of 1 ==
Date: Mon, Jan 4 2010 11:44Â am
From: "Bassford, Lynn" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5004 PERIOD COVERED: 5am December 31, 2009 - 5am January 4, 2010 (DOY 365/10:00z-004/10:00z) OBSERVATIONS SCHEDULED 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 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 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 11907 UVIS Cycle 17 Contamination Monitor The UV throughput of WFC3 during Cycle 17 is monitored via weekly
standard star observations in a subset of key filters covering
200-600nm and F606W, F814W as controls on the red end
The data will
provide a measure of throughput levels as a function of time and
wavelength, allowing for detection of the presence of possible
contaminants
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/ACS 11888 ACS Internal Flat Fields The stability of the CCD flat fields will be monitored using the
calibration lamps and a sub-sample of the filter set
High signal
observations will be used to assess the stability of the
pixel-to-pixel flat field structure and to monitor the position of the
dust motes
ACS/WFC3 11879 CCD Daily Monitor (Part 1) 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 352 orbits (22 weeks) from 31 August
2009 to 31 January 2010
STIS/CCD 11849 STIS CCD Hot Pixel Annealing This purpose of this activity is to repair radiation induced hot pixel
damage to the STIS CCD by warming the CCD to the ambient instrument
temperature and annealing radiation-damaged pixels
Radiation damage creates hot pixels in the STIS CCD Detector
Many of
these hot pixels can be repaired by warming the CCD from its normal
operating temperature near - 83 deg
C to the ambient instrument
temperature (~ +5 deg
C) for several hours
The number of hot pixels
repaired is a function of annealing temperature
The effectiveness of
the CCD hot pixel annealing process is assessed by measuring the dark
current behavior before and after annealing and by searching for any
window contamination effects
STIS/CCD 11846 CCD Bias Monitor-Part 1 The purpose of this proposal is to 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 11844 CCD Dark Monitor Part 1 The purpose of this proposal is to monitor the darks for the STIS CCD
COS/NUV/FUV 11742 Probing HeII Reionization with GALEX-selected Quasar Sightlines and
HST/COS We propose spectroscopic observations with COS of eight z~3 QSOs that
we found to be bright in the far ultraviolet
Our aim is to study
intergalactic absorption caused by the onset of the He II Lyman
forest
Several lines of evidence suggest that helium reionization
occurred at z~3
Understanding this process is critical for a complete
picture of the intergalactic medium and its evolution; it also gives
clues to hydrogen reionization at z>6
The only direct means of
assessing He II reionization is through far- UV observations of the He
II Lyman alpha forest
Only 6 sightlines are known to date where this
is feasible, despite extensive surveys
Our program is designed to
double the number of available sightlines
To this effect, we
cross-correlated all known z>2
73 quasars with UV source lists from
the GALEX satellite
The selected quasars were all significantly
detected in the far UV by GALEX, and their UV colors are similar to
those of already known quasars with transparent sightlines
Spectra
obtained with COS will allow us to compile the first comprehensive
sample of He II absorption spectra probing similar redshifts, enabling
a systematic investigation of the He II reionization epoch and the
spectral shape of the UV background
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/IR 11719 A Calibration Database for Stellar Models of Asymptotic Giant Branch
Stars Studies of galaxy formation and evolution rely increasingly on the
interpretation and modeling of near-infrared observations
At these
wavelengths, the brightest stars are intermediate mass asymptotic
giant branch (AGB) stars
These stars can contribute nearly 50% of the
integrated luminosity at near infrared and even optical wavelengths,
particularly for the younger stellar populations characteristic of
high-redshift galaxies (z>1)
AGB stars are also significant sources
of dust and heavy elements
Accurate modeling of AGB stars is
therefore of the utmost importance
The primary limitation facing current models is the lack of useful
calibration data
Current models are tuned to match the properties of
the AGB population in the Magellanic Clouds, and thus have only been
calibrated in a very narrow range of sub- solar metallicities
Preliminary observations already suggest that the models are
overestimating AGB lifetimes by factors of 2-3 at lower metallicities
At higher (solar) metallicities, there are no appropriate observations
for calibrating the models
We propose a WFC3/IR SNAP survey of nearby galaxies to create a large
database of AGB populations spanning the full range of metallicities
and star formation histories
Because of their intrinsically red
colors and dusty circumstellar envelopes, tracking the numbers and
bolometric fluxes of AGB stars requires the NIR observations we
propose here
The resulting observations of nearby galaxies with deep
ACS imaging offer the opportunity to obtain large (100-1000's)
complete samples of AGB stars at a single distance, in systems with
well-constrained star formation histories and metallicities
WFC3/UVIS 11714 Snapshot Survey for Planetary Nebulae in Local Group Globular Clusters PLanetary nebulae (PNe) in globular clusters (GCs) raise a number of
interesting issues related to stellar and galactic evolution
The
number of PNe known in Milky Way GCs, four, is surprisingly low if one
assumes that all stars pass through a PN stage
However, it is likely
that the remnants of stars now evolving in galactic GCs leave the AGB
so slowly that any ejected nebula dissipates long before the star
becomes hot enough to ionize it
Thus there should not be ANY PNe in
Milky Way GCs--but there are four! It has been suggested that these
Pne are the result of mergers of binary stars within GCs, i
e
, that
they are descendants of blue stragglers
The frequency of occurrence
of PNe in external galaxies poses more questions, because it shows a
range of almost an order of magnitude
I propose a SNAPshot survey aimed at discovering PNe in the GC systems
of Local Group galaxies outside the Milky Way
These clusters, some of
which may be much younger than their counterparts in our galaxy, might
contain many more PNe than those of our own galaxy
I will use the
standard technique of emission-line and continuum imaging, which
easily discloses PNe
This proposal continues a WFPC2 program started
in Cycle 16, but with the more powerful WFC3
As a by-product, the
survey will also produce color-magnitude diagrams for numerous
clusters for the first time, reaching down to the horizontal branch
FGS 11706 The Parallax of the Planet Host Star XO-3 We will use HST+FGS to measure the parallax of the transiting planet
host star XO 3
The resulting accurate distance measurement will
provide the most accurate radius determination to date for this
massive extrasolar planet (XO-3B), allowing us to critically test
current giant extrasolar planet structure models
These observations
will also constrain the amount of heating that may be produced inside
XO-3B by tides raised on the planet as it moves through its 3
2
d-eccentric (e ~ 0
22) orbit
STIS/CCD 11703 The Nature of the Black Hole in a NGC 4472 Globular Cluster and the
Origin of Its Broad [OIII] Emission We propose to use STIS to obtain optical spectroscopy at high spatial
resolution of the black hole-hosting globular cluster RZ2109 in the
Virgo elliptical NGC 4472
This is motivated by our very recent
discovery broad [OIII] 4959, 5007 emission with a width of several
thousand km/s in this globular cluster
The STIS spectroscopy will
enable us to determine if the very broad [OIII] emission is due to
material driven at high velocity from the central accreting black hole
across the globular cluster, or if the velocity widths are due to
gravitational motions very close to the central black hole
In the
former case, the [OIII] emission should extend over a few-tenths of an
arcsecond and be spatially resolved by HST and STIS, while in the
latter case, the emission lines will be unresolved
Distinguishing
between these two possibilities will allow us to - 1) determine
whether the black hole is of intermediate mass or a stellar mass, and
thereby whether the black hole mass - sigma relation extends to
globular cluster masses, 2) test models of black hole formation and
evolution in dense stellar systems, and 3) address the nature of
accretion in the high luminosity black-hole X-ray source, and
constrain the feedback processes from luminous black holes into their
surrounding medium in dense stellar systems
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
ofthe 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
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 11657 The Population of Compact Planetary Nebulae in the Galactic Disk We propose to secure narrow- and broad-band images of compact
planetary nebulae (PNe) in the Galactic Disk to study the missing link
of the early phases of post-AGB evolution
Ejected AGB envelopes
become PNe when the gas is ionized
PNe expand, and, when large
enough, can be studied in detail from the ground
In the interim, only
the HST capabilities can resolve their size, morphology, and central
stars
Our proposed observations will be the basis for a systematic
study of the onset of morphology
Dust properties of the proposed
targets will be available through approved Spitzer/IRS spectra, and so
will the abundances of the alpha-elements
We will be able thus to
explore the interconnection of morphology, dust grains, stellar
evolution, and populations
The target selection is suitable to
explore the nebular and stellar properties across the galactic disk,
and to set constraints on the galactic evolutionary models through the
analysis of metallicity and population gradients
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/ACS/UVIS 11613 GHOSTS: Stellar Outskirts of Massive Spiral Galaxies We propose to continue our highly successful GHOSTS HST survey of the
resolved stellar populations of nearby, massive disk galaxies using
SNAPs
These observations provide star counts and color-magnitude
diagrams 2-3 magnitudes below the tip of the Red Giant Branch of the
outer disk and halo of each galaxy
We will measure the metallicity
distribution functions and stellar density profiles from star counts
down to very low average surface brightnesses, equivalent to ~32 V-mag
per square arcsec
This proposal will substantially improve our unique sampling of galaxy
outskirts
Our targets cover a range in galaxy mass, luminosity,
inclination, and morphology
As a function of these galaxy properties,
this survey provides: - the most extensive, systematic measurement of
radial light profiles and axial ratios of the diffuse stellar halos
and outer disks of spiral galaxies; - a comprehensive analysis of halo
metallicity distributions as function of galaxy type and position
within the galaxy; - an unprecedented study of the stellar metallicity
and age distribution in the outer disk regions where the disk
truncations occur; - the first comparative study of globular clusters
and their field stellar populations
We will use these fossil records of the galaxy assembly process to
test halo formation models within the hierarchical galaxy formation
scheme
ACS/WFC3 11599 Distances of Planetary Nebulae from SNAPshots of Resolved Companions Reliable distances to individual planetary nebulae (PNe) in the Milky
Way are needed to advance our understanding of their spatial
distribution, birthrates, influence on galactic chemistry, and the
luminosities and evolutionary states of their central stars (CSPN)
Few PNe have good distances, however
One of the best ways to remedy
this problem is to find resolved physical companions to the CSPN and
measure their distances by photometric main-sequence fitting
We have
previously used HST to identify and measure probable companions to 10
CSPN, based on angular separations and statistical arguments only
We
now propose to use HST to re-observe 48 PNe from that program for
which additional companions are possibly present
We then can use the
added criterion of common proper motion to confirm our original
candidate companions and identify new ones in cases that could not
confidently be studied before
We will image the region around each
CSPN in the V and I bands, and in some cases in the B band
Field
stars that appear close to the CSPN by chance will be revealed by
their relative proper motion during the 13+ years since our original
survey, leaving only genuine physical companions in our improved and
enlarged sample
This study will increase the number of Galactic PNe
with reliable distances by 50 percent and improve the distances to PNe
with previously known companions
WFC3/UVIS 11565 A Search for Astrometric Companions to Very Low-Mass, Population II
Stars We propose to carry out a Snapshot search for astrometric companions
in a subsample of very low-mass, halo subdwarfs identified within 120
parsecs of the Sun
These ultra-cool M subdwarfs are local
representatives of the lowest-mass H burning objects from the Galactic
Population II
The expected 3-4 astrometric doubles that will be
discovered will be invaluable in that they will be the first systems
from which gravitational masses of metal-poor stars at the bottom of
the main sequence can be directly measured
NIC2/WFC3/IR 11548 Infrared Imaging of Protostars in the Orion A Cloud: The Role of
Environment in Star Formation We propose NICMOS and WFC3/IR observations of a sample of 252
protostars identified in the Orion A cloud with the Spitzer Space
Telescope
These observations will image the scattered light escaping
the protostellar envelopes, providing information on the shapes of
outflow cavities, the inclinations of the protostars, and the overall
morphologies of the envelopes
In addition, we ask for Spitzer time to
obtain 55-95 micron spectra of 75 of the protostars
Combining these
new data with existing 3
6 to 70 micron photometry and forthcoming
5-40 micron spectra measured with the Spitzer Space Telescope, we will
determine the physical properties of the protostars such as envelope
density, luminosity, infall rate, and outflow cavity opening angle
By
examining how these properties vary with stellar density (i
e
clusters vs
groups vs
isolation) and the properties of the
surrounding molecular cloud; we can directly measure how the
surrounding environment influences protostellar evolution, and
consequently, the formation of stars and planetary systems
Ultimately, this data will guide the development of a theory of
protostellar evolution
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 11522 COS-GTO: Star Formation/Lyman-Alpha A sample of 20 star-forming galaxies will be observed with COS G130M
The galaxies were selected from the Kitt Peak International
Spectroscopic Survey (KISSR) data release and cover a broad range of
luminosity, oxygen abundance, and reddening
The goal of the program
is to characterize the Lyman-alpha properties and establish
correlations with fundamental galaxy properties
Each galaxy will be
observed for one orbit
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/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/IR 11189 Probing the Early Universe with GRBs Cosmology is beginning to constrain the nature of the earliest stars
and galaxies to form in the Universe, but direct observation of
galaxies at z>6 remains highly challenging due to their scarcity,
intrinsically small size, and high luminosity distance
GRB
afterglows, thanks to their extreme luminosities, offer the
possibility of circumventing these normal constraints by providing
redshifts and spectral information which couldn't be obtained through
direct observation of the host galaxies themselves
In addition, the
association of GRBs with massive stars means that they are an
indicator of star formation, and that their hosts are likely
responsible for a large proportion of the ionizing radiation during
that era
Our collaboration is conducting a campaign to rapidly
identify and study candidate very high redshift bursts, bringing to
bear a network of 2, 4 and 8m telescopes with near-IR instrumentation
Swift has proven capable of detecting faint, distant GRBs, and
reporting accurate positions for many bursts in near real-time
Here
we propose to continue our HST program of targeting GRBs at z~6 and
above
HST is crucial to this endeavor, allowing us (a) to
characterize the basic properties, such as luminosity and color, and
in some cases morphologies, of the hosts, which is essential to
understanding these primordial galaxies and their relationship to
other galaxy populations; and (b) to monitor the late time afterglows
and hence compare them to lower-z bursts and test the use of GRBs as
standard candles
NIC3/WFC3/IR 11149 Characterizing the Stellar Populations in Lyman-Alpha Emitters and
Lyman Break Galaxies at 5
7 The epoch of reionization marks a major phase transition of the
Universe, during which the intergalactic space became transparent to
UV photons
Determining when this occurred and the physical processes
involved represents the latest frontier in observational cosmology
Over the last few years, searches have intensified to identify the
population of high-redshift (z>6) galaxies that might be responsible
for this process, but the progress is hampered partly by the
difficulty of obtaining physical information (stellar mass, age, star
formation rate/history) for individual sources
This is because the
number of z>6 galaxies that have both secure spectroscopic redshifts
and high-quality infrared photometry (especially with Spitzer/IRAC) is
still fairly small
Considering that only several photometric points
are available per source, and that many model SEDs are highly
degenerate, it is crucial to obtain as many observational constraints
as possible for each source to ensure the validity of SED modeling
To
better understand the physical properties of high-redshift galaxies,
we propose here to conduct HST/NICMOS (72 orbits) and Spitzer/IRAC
(102 hours) imaging of spectroscopically confirmed, bright (z<26 mag
(AB)) Ly-alpha emitters (LAEs) and Lyman-break galaxies (LBGs) at
5
7 FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary
reports of potential non-nominal performance that will be
investigated
) HSTARS: limit exceeded on FGS1
Observations affected: WFC3 #200-201 Proposal #11644, WFC3 #202
Proposal #11929 003/10:34:21z, 003/12:10:15z and 003/13:46:09z result in fine lock
backup on FGS1
Observations possibly affected: COS #111-114 Proposal #11742, WFC3 Proposal #11844 003/18:33:23z and 003/20:09:21z resulted in fine lock backup (1,0,1) Observations possibly affected: COS #115-130 Proposal #11541, STIS #49
Proposal #11844, STIS #50-52 Proposal #11846, WFC3 #228-231 Proposal COMPLETED OPS REQUEST: (None) COMPLETED OPS NOTES: (None) FGS GSAcq 29 28
FGS REAcq 35 35
OBAD with Maneuver 25 25 SIGNIFICANT EVENTS: (None) ==============================================================================
TOPIC: Daily Report #5005 == 1 of 1 ==
Date: Tues, Jan 5 2010 9:23Â am
From: "Bassford, Lynn" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5005 PERIOD COVERED: 5am January 4 - 5am January 5, 2010 (DOY 004/10:00z-005/10:00z) OBSERVATIONS SCHEDULED ACS/WFC3 11735 The LSD Project: Dynamics, Merging and Stellar Populations of a Sample
of Well- Studied LBGs at z~3 A large observational effort with the ground-based ESO/VLT telescopes
allowed us to obtain deep, spatially-resolved, near-IR spectra of
complete sample of 11 Lyman-Break Galaxies at z~3
1
These
observations were used to obtain, for the first time, the metallicity
and the dynamical properties of a sample of objects that, albeit
small, is representative of the total population of the LBGs
We
propose to use HST to obtain high-resolution optical and near-IR
images of this sample of LBGs in order to study the broad-band
morphology and the stellar light distribution of these galaxies
These
images, exploiting the superior spatial resolution of HST images and
the low- background : 1- will allow a precise measure of the dynamical
mass from the velocity field derived with spectroscopy; 2- will permit
a comparison of the distribution of star formation (from the line
emission) with the underlying stellar population, and, 3- will be used
to check if the complex velocity field and the multiple line-emitting
regions detected in most targets can be ascribed to on-going mergers
This accurate study will shed light on a number of unsolved problems
still affecting the knowledge of the LBGs
ACS/WFC3 11879 CCD Daily Monitor (Part 1) 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 352 orbits (22 weeks) from 31 August
2009 to 31 January 2010
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/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
COS/NUV/FUV 11741 Probing Warm-Hot Intergalactic Gas at 0
5 < z < 1
3 with a Blind
Survey for O VI, Ne VIII, Mg X, and Si XII Absorption Systems Currently we can only account for half of the baryons (or less)
expected to be found in the nearby universe based on D/H and CMB
observations
This "missing baryons problem" is one of the
highest-priority challenges in observational extragalatic astronomy
Cosmological simulations suggest that the baryons are hidden in
low-density, shock-heated intergalactic gas in the log T = 5 - 7
range, but intensive UV and X-ray surveys using O VI, O VII, and O
VIII absorption lines have not yet confirmed this prediction
We
propose to use COS to carry out a sensitive survey for Ne VIII and Mg
X absorption in the spectra of nine QSOs at z(QSO) > 0
89
For the
three highest-redshift QSOs, we will also search for Si XII
This
survey will provide more robust constraints on the quantity of baryons
in warm-hot intergalactic gas at 0
5 < z < 1
3, and the data will
provide rich constraints on the metal enrichment, physical conditions,
and nature of a wide variety of QSO absorbers in addition to the
warm-hot systems
By comparing the results to other surveys at lower
redshifts (with STIS, FUSE, and from the COS GTO programs), the
project will also enable the first study of how these absorbers evolve
with redshift at z < 1
By combining the program with follow-up galaxy
redshift surveys, we will also push the study of galaxy-absorber
relationships to higher redshifts, with an emphasis on the
distribution of the WHIM with respect to the large-scale matter
distribution of the universe
NIC3/WFC3/IR 11149 Characterizing the Stellar Populations in Lyman-Alpha Emitters and
Lyman Break Galaxies at 5
7 The epoch of reionization marks a major phase transition of the
Universe, during which the intergalactic space became transparent to
UV photons
Determining when this occurred and the physical processes
involved represents the latest frontier in observational cosmology
Over the last few years, searches have intensified to identify the
population of high-redshift (z>6) galaxies that might be responsible
for this process, but the progress is hampered partly by the
difficulty of obtaining physical information (stellar mass, age, star
formation rate/history) for individual sources
This is because the
number of z>6 galaxies that have both secure spectroscopic redshifts
and high-quality infrared photometry (especially with Spitzer/IRAC) is
still fairly small
Considering that only several photometric points
are available per source, and that many model SEDs are highly
degenerate, it is crucial to obtain as many observational constraints
as possible for each source to ensure the validity of SED modeling
To
better understand the physical properties of high-redshift galaxies,
we propose here to conduct HST/NICMOS (72 orbits) and Spitzer/IRAC
(102 hours) imaging of spectroscopically confirmed, bright (z<26 mag
(AB)) Ly-alpha emitters (LAEs) and Lyman-break galaxies (LBGs) at
5
7 STIS/CCD 11844 CCD Dark Monitor Part 1 The purpose of this proposal is to monitor the darks for the STIS CCD
STIS/CCD 11846 CCD Bias Monitor-Part 1 The purpose of this proposal is to 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/MA2 11568 A SNAPSHOT Survey of the Local Interstellar Medium: New NUV
Observations of Stars with Archived FUV Observations We propose to obtain high-resolution STIS E230H SNAP observations of
MgII and FeII interstellar absorption lines toward stars within 100
parsecs that already have moderate or high-resolution far-UV (FUV),
900-1700 A, observations available in the MAST Archive
Fundamental
properties, such as temperature, turbulence, ionization, abundances,
and depletions of gas in the local interstellar medium (LISM) can be
measured by coupling such observations
Due to the wide spectral range
of STIS, observations to study nearby stars also contain important
data about the LISM embedded within their spectra
However, unlocking
this information from the intrinsically broad and often saturated FUV
absorption lines of low-mass ions, (DI, CII, NI, OI), requires first
understanding the kinematic structure of the gas along the line of
sight
This can be achieved with high resolution spectra of high-mass
ions, (FeII, MgII), which have narrow absorption lines, and can
resolve each individual velocity component (interstellar cloud)
By
obtaining short (~10 minute) E230H observations of FeII and MgII, for
stars that already have moderate or high-resolution FUV spectra, we
can increase the sample of LISM measurements, and thereby expand our
knowledge of the physical properties of the gas in our galactic
neighborhood
STIS is the only instrument capable of obtaining the
required high resolution data now or in the foreseeable future
WFC3/ACS/IR 11584 Resolving the Smallest Galaxies with ACS An order of magnitude more dwarf galaxies are expected to inhabit the
Local Group, based on currently accepted galaxy formation models, than
have been observed
This discrepancy has been noted in environments
ranging from the field to rich clusters, with evidence emerging that
lower density regions contain fewer dwarfs per giant than higher
density regions, in further contrast to model predictions
However,
there is no complete census of the faintest dwarf galaxies in any
environment
The discovery of the smallest and faintest dwarfs is
hampered by the limitations in detecting such compact or low surface
brightness galaxies, and this is compounded by the great difficulty in
determining accurate distances to, or ascertaining group membership
for, such faint objects
The M81 group provides a powerful means for
establishing membership for faint galaxies in a low density region
With a distance modulus of 27
8, the tip of the red giant branch
(TRGB) appears at I ~ 24, just within the reach of ground based
surveys
We have completed a 65 square degree survey in the region
around M81 with the CFHT/MegaCam
Half of our survey was completed
before Cycle 16 and we were awarded time with WFPC2 to observe 15 new
candidate dwarf galaxy group members in F606W and F814W bands in order
to construct color-magnitude diagrams from which to measure accurate
TRGB distances and determine star formation and metallicity histories
The data obtained show that 8 - 9 of these objects are galaxies at the
same distance as M81
In completing our survey, we have discovered an
additional 8 candidate galaxies we propose to image with ACS in order
to measure TRGB distances and establish membership
We also wish to
re-observe our smallest candidate group member and a tidal dwarf
candidate with deeper observations made possible with ACS
Once
membership has been established for this second set of candidates, we
will have a complete census of the dwarf galaxy population in the M8
group to M_r ~ -10, allowing us to obtain a firm measurement of the
luminosity function faint-end slope, and, combined with previous HST
data, to provide a complete inventory of the age and abundance
properties for the collapsed core of the M81 group
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 11712 Calibration of Surface Brightness Fluctuations for WFC3/IR We aim to characterize galaxy surface brightness fluctuations (SBF),
and calibrate the SBF distance method, in the F110W and F160W filters
of the Wide Field Camera 3 IR channel
Because of the very high
throughput of F110W and the good match of F160W to the standard H
band, we anticipate that both of these filters will be popular choices
for galaxy observations with WFC3/IR
The SBF signal is typically an
order of magnitude brighter in the near-IR than in the optical, and
the characteristics (sensitivity, FOV, cosmetics) of the WFC3/IR
channel will be enormously more efficient for SBF measurements than
previously available near-IR cameras
As a result, our proposed SBF
calibration will allow accurate distance derivation whenever an
early-type or bulge- dominated galaxy is observed out to a distance of
150 Mpc or more (i
e
, out to the Hubble flow) in the calibrated
passbands
For individual galaxy observations, an accurate distance is
useful for establishing absolute luminosities, black hole masses,
linear sizes, etc
Eventually, once a large number of galaxies have
been observed across the sky with WFC3/IR, this SBF calibration will
enable accurate mapping of the total mass density distribution in the
local universe using the data available in the HST archive
The
proposed observations will have additional important scientific value;
in particular, we highlight their usefulness for understanding the
nature of multimodal globular cluster color distributions in giant
elliptical galaxies
WFC3/IR 11719 A Calibration Database for Stellar Models of Asymptotic Giant Branch
Stars Studies of galaxy formation and evolution rely increasingly on the
interpretation and modeling of near-infrared observations
At these
wavelengths, the brightest stars are intermediate mass asymptotic
giant branch (AGB) stars
These stars can contribute nearly 50% of the
integrated luminosity at near infrared and even optical wavelengths,
particularly for the younger stellar populations characteristic of
high-redshift galaxies (z>1)
AGB stars are also significant sources
of dust and heavy elements
Accurate modeling of AGB stars is
therefore of the utmost importance
The primary limitation facing current models is the lack of useful
calibration data
Current models are tuned to match the properties of
the AGB population in the Magellanic Clouds, and thus have only been
calibrated in a very narrow range of sub- solar metallicities
Preliminary observations already suggest that the models are
overestimating AGB lifetimes by factors of 2-3 at lower metallicities
At higher (solar) metallicities, there are no appropriate observations
for calibrating the models
We propose a WFC3/IR SNAP survey of nearby galaxies to create a large
database of AGB populations spanning the full range of metallicities
and star formation histories
Because of their intrinsically red
colors and dusty circumstellar envelopes, tracking the numbers and
bolometric fluxes of AGB stars requires the NIR observations we
propose here
The resulting observations of nearby galaxies with deep
ACS imaging offer the opportunity to obtain large (100-1000's)
complete samples of AGB stars at a single distance, in systems with
well-constrained star formation histories and metallicities
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
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
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 09 09
FGS REAcq 10 10
OBAD with Maneuver 07 07 SIGNIFICANT EVENTS: (None) ==============================================================================
TOPIC: Daily Report #5006 == 1 of 1 ==
Date: Wed, Jan 6 2010 6:22Â am
From: "Bassford, Lynn" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5006 PERIOD COVERED: 5am January 5 - 5am January 6, 2010 (DOY 005/10:00z-006/10:00z) OBSERVATIONS SCHEDULED COS/NUV/FUV 11741 Probing Warm-Hot Intergalactic Gas at 0
5 < z < 1
3 with a Blind
Survey for O VI, Ne VIII, Mg X, and Si XII Absorption Systems Currently we can only account for half of the baryons (or less)
expected to be found in the nearby universe based on D/H and CMB
observations
This "missing baryons problem" is one of the
highest-priority challenges in observational extragalatic astronomy
Cosmological simulations suggest that the baryons are hidden in
low-density, shock-heated intergalactic gas in the log T = 5 - 7
range, but intensive UV and X-ray surveys using O VI, O VII, and O
VIII absorption lines have not yet confirmed this prediction
We
propose to use COS to carry out a sensitive survey for Ne VIII and Mg
X absorption in the spectra of nine QSOs at z(QSO) > 0
89
For the
three highest-redshift QSOs, we will also search for Si XII
This
survey will provide more robust constraints on the quantity of baryons
in warm-hot intergalactic gas at 0
5 < z < 1
3, and the data will
provide rich constraints on the metal enrichment, physical conditions,
and nature of a wide variety of QSO absorbers in addition to the
warm-hot systems
By comparing the results to other surveys at lower
redshifts (with STIS, FUSE, and from the COS GTO programs), the
project will also enable the first study of how these absorbers evolve
with redshift at z < 1
By combining the program with follow-up galaxy
redshift surveys, we will also push the study of galaxy-absorber
relationships to higher redshifts, with an emphasis on the
distribution of the WHIM with respect to the large-scale matter
distribution of the universe
NIC2/WFC3/IR 11219 Active Galactic Nuclei in Nearby Galaxies: A New View of the Origin of
the Radio-Loud Radio-Quiet Dichotomy? Using archival HST and Chandra observations of 34 nearby early-type
galaxies (drawn from a complete radio selected sample) we have found
evidence that the radio- loud/radio-quiet dichotomy is directly
connected to the structure of the inner regions of their host galaxies
in the following sense: [1] Radio-loud AGN are associated with
galaxies with shallow cores in their light profiles [2] Radio-quiet
AGN are only hosted by galaxies with steep cusps
Since the brightness
profile is determined by the galaxy's evolution, through its merger
history, our results suggest that the same process sets the AGN
flavor
This provides us with a novel tool to explore the co-evolution
of galaxies and supermassive black holes, and it opens a new path to
understand the origin of the radio-loud/radio-quiet AGN dichotomy
Currently our analysis is statistically incomplete as the brightness
profile is not available for 82 of the 116 targets
Most galaxies were
not observed with HST, while in some cases the study is obstructed by
the presence of dust features
We here propose to perform an infrared
NICMOS snapshot survey of these 82 galaxies
This will enable us to i)
test the reality of the dichotomic behavior in a substantially larger
sample; ii) extend the comparison between radio-loud and radio- quiet
AGN to a larger range of luminosities
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/CCD 11844 CCD Dark Monitor Part 1 The purpose of this proposal is to monitor the darks for the STIS CCD
STIS/CCD 11846 CCD Bias Monitor-Part 1 The purpose of this proposal is to 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 11817 Detecting the Upper Atmosphere of a Transiting Hot Neptune: A
Feasibility Study Atmospheric escape is a phenomenon that shapes planetary atmospheres,
from telluric planets in the Solar System to extrasolar 'hot
Jupiters'
It dramatically enhances the detectability of a heavily
irradiated hydrogen atmosphere, providing the planet is transiting its
star and the transits are observed in the ultraviolet, at Lyman alpha
The 'hot Neptune' transiting the M dwarf GJ436 is the best analog we
have to a transiting super-Earth
Internal structure and atmospheric
models predict that it bears an extended hydrogen/helium atmosphere
subject to evaporation
It is detectable with the Space Telescope
Imaging Spectrograph, providing the background Lyman-alpha source -
the star - is bright enough or, alternatively, the emission line
profile spans over a large velocity range
To date, no spectra of
GJ436 exist at this wavelength
Using 1 orbit of Director's
Discretionary Time, we aim at properly estimating the stellar
Lyman-alpha flux and line profile
This DDT will serve as a basis for
a Cycle-18 program aimed at detecting the atmosphere of hot-Neptune
GJ436b and constraining both internal structure and atmospheric
models
WFC3/ACS/IR 11584 Resolving the Smallest Galaxies with ACS An order of magnitude more dwarf galaxies are expected to inhabit the
Local Group, based on currently accepted galaxy formation models, than
have been observed
This discrepancy has been noted in environments
ranging from the field to rich clusters, with evidence emerging that
lower density regions contain fewer dwarfs per giant than higher
density regions, in further contrast to model predictions
However,
there is no complete census of the faintest dwarf galaxies in any
environment
The discovery of the smallest and faintest dwarfs is
hampered by the limitations in detecting such compact or low surface
brightness galaxies, and this is compounded by the great difficulty in
determining accurate distances to, or ascertaining group membership
for, such faint objects
The M81 group provides a powerful means for
establishing membership for faint galaxies in a low density region
With a distance modulus of 27
8, the tip of the red giant branch
(TRGB) appears at I ~ 24, just within the reach of ground based
surveys
We have completed a 65 square degree survey in the region
around M81 with the CFHT/MegaCam
Half of our survey was completed
before Cycle 16 and we were awarded time with WFPC2 to observe 15 new
candidate dwarf galaxy group members in F606W and F814W bands in order
to construct color-magnitude diagrams from which to measure accurate
TRGB distances and determine star formation and metallicity histories
The data obtained show that 8 - 9 of these objects are galaxies at the
same distance as M81
In completing our survey, we have discovered an
additional 8 candidate galaxies we propose to image with ACS in order
to measure TRGB distances and establish membership
We also wish to
re-observe our smallest candidate group member and a tidal dwarf
candidate with deeper observations made possible with ACS
Once
membership has been established for this second set of candidates, we
will have a complete census of the dwarf galaxy population in the M8
group to M_r ~ -10, allowing us to obtain a firm measurement of the
luminosity function faint-end slope, and, combined with previous HST
data, to provide a complete inventory of the age and abundance
properties for the collapsed core of the M81 group
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/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
WFC3/IR 11712 Calibration of Surface Brightness Fluctuations for WFC3/IR We aim to characterize galaxy surface brightness fluctuations (SBF),
and calibrate the SBF distance method, in the F110W and F160W filters
of the Wide Field Camera 3 IR channel
Because of the very high
throughput of F110W and the good match of F160W to the standard H
band, we anticipate that both of these filters will be popular choices
for galaxy observations with WFC3/IR
The SBF signal is typically an
order of magnitude brighter in the near-IR than in the optical, and
the characteristics (sensitivity, FOV, cosmetics) of the WFC3/IR
channel will be enormously more efficient for SBF measurements than
previously available near-IR cameras
As a result, our proposed SBF
calibration will allow accurate distance derivation whenever an
early-type or bulge- dominated galaxy is observed out to a distance of
150 Mpc or more (i
e
, out to the Hubble flow) in the calibrated
passbands
For individual galaxy observations, an accurate distance is
useful for establishing absolute luminosities, black hole masses,
linear sizes, etc
Eventually, once a large number of galaxies have
been observed across the sky with WFC3/IR, this SBF calibration will
enable accurate mapping of the total mass density distribution in the
local universe using the data available in the HST archive
The
proposed observations will have additional important scientific value;
in particular, we highlight their usefulness for understanding the
nature of multimodal globular cluster color distributions in giant
elliptical galaxies
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/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/IR 11702 Search for Very High-z Galaxies with WFC3 Pure Parallel WFC3 will provide an unprecedented probe to the early universe beyond
the current redshift frontier
Here we propose a pure parallel program
using this new instrument to search for Lyman-break galaxies at
6
5 (1) We will use both the UVIS and the IR channels, and do not need to
seek optical data from elsewhere
(2) Our program will likely triple the size of the probable candidate
samples at z~7 and z~8, and will complement other targeted programs
aiming at the similar redshift range
(3) Being a pure parallel program, our survey will only make very
limited demand on the scarce HST resources
More importantly, as the
pure parallel pointings will be at random sight-lines, our program
will be least affected by the bias due to the large scale structure
("cosmic variance")
(4) We aim at the most luminous LBG population, and will address the
bright-end of the luminosity function at z~8 and z~7
We will
constrain the value of L* in particular, which is critical for
understanding the star formation process and the stellar mass assembly
history in the first few hundred million years of the universe
(5) The candidates from our survey, most of which will be the
brightest ones that any surveys would be able to find, will have the
best chance to be spectroscopically confirmed at the current 8--10m
telescopes
(6) We will also find a large number of extremely red, old galaxies at
intermediate redshifts, and the fine spatial resolution offered by the
WFC3 will enable us constrain their formation history based on the
study of their morphology, and hence shed light on their connection to
the very early galaxies in the universe
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
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 06 06
FGS REAcq 09 09
OBAD with Maneuver 04 04 SIGNIFICANT EVENTS: (None) ==============================================================================
TOPIC: Daily Report #5007 == 1 of 1 ==
Date: Thurs, Jan 7 2010 6:38Â am
From: "Bassford, Lynn" HUBBLE SPACE TELESCOPE - Continuing to Collect World Class Science DAILY REPORT #5007 PERIOD COVERED: 5am January 6 - 5am January 7, 2010 (DOY 006/10:00z-007/10:00z) OBSERVATIONS SCHEDULED ACS/WFC3 11879 CCD Daily Monitor (Part 1) 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 352 orbits (22 weeks) from 31 August
2009 to 31 January 2010
COS/FUV 11526 COS-GTO: Sampling the Local ISM with Hot White Dwarfs We shall use hot white dwarf stars located within 150pc of the Sun to
probe the absorption properties of the interstellar gas associated
with the local cavity
There is still much debate concerning the
ionization state of the local gas, since previously detected highly
ionized lines (such as CIV and SiIV) could be associated with the
circumstellar environments of hot white dwarfs
By using a priori
knowledge of the velocity structure of the interstellar sight-lines to
these targets (gained from high spectral resolution ground- based
observations) in conjunction with the UV absorption data gained with
HST-COS, we shall be able to better determine both the physical and
chemical state of the numerous diffuse interstellar clouds present
within the local cavity
COS/FUV 11895 FUV Detector Dark Monitor The purpose of this proposal is to 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 11896 NUV Spectroscopic Sensitivity Monitoring The purpose of this proposal is to monitor sensitivity of each NUV
grating mode to detect any changes due to contamination or other
causes
STIS/CCD 11844 CCD Dark Monitor Part 1 The purpose of this proposal is to monitor the darks for the STIS CCD
STIS/CCD 11846 CCD Bias Monitor-Part 1 The purpose of this proposal is to 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 11866 Echelle Grating Blaze Function Zero Points We will observe the flux standard G191B2B, obtaining echelle spectra
in all primary and intermediate wavelength settings
While this was
done in cycle 10 (8915), the echelle blaze shift has proved to depend
sensitively on side of operation, time and the exact MSM positioning
We therefore believe it is important to obtain a complete set of post-
repair data at default MSM position to allow a comprehensive solution
for the echelle blaze shifts on a repaired side 2
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
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
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 6 6
FGS REAcq 12 12
OBAD with Maneuver 4 4 SIGNIFICANT EVENTS: (None) ============================================================================== You received this message because you are subscribed to the Google Groups "sci
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12148 GSAcq(1,2,1) @2010/002/11:45:50z failed due to search radius
12150 GSAcq(1,2,1) @2010/003/07:21:19z and REAcqs @003/08:58:27z,
223-227 Proposal #11696, STIS #46-47 Proposal #11849, STIS #48
12152 GSAcq(1,2,1) @2010/003/15:22:27z and REAcqs @003/16:57:25z,
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