HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       # 4301 PERIOD COVERED: UT February 15, 2007 (DOY 046) OBSERVATIONS SCHEDULED WFPC2 10520 Resolving the Complex Star Formation History of the Leo I Dwarf Spheroidal Galaxy Determining the star formation histories {SFHs} and chemical evolution of nearby galaxies gives us powerful constrains on the physical processes that regulate galaxy evolution. The SFHs can be measured most accurately by compar ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT       # 4300 PERIOD COVERED: UT February 14, 2007 (DOY 045) OBSERVATIONS SCHEDULED WFPC2 10910 HST / Chandra Monitoring of a Dramatic Flare in the M87 Jet As the nearest galaxy with an optical jet, M87 affords an unparalleled opportunity to study extragalactic jet phenomena at the highest resolution. During 2002, HST and Chandra monitoring of the M87 jet detected a dramatic flare in knot HST-1 located ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT      # 4299 PERIOD COVERED: UT February 13, 2007 (DOY 044) OBSERVATIONS SCHEDULED WFPC2 10918 Reducing Systematic Errors on the Hubble Constant: Metallicity Calibration of the Cepheid PL Relation Reducing the systematic errors on the Hubble constant is still of significance and of immediate importance to modern cosmology. One of the largest remaining uncertainties in the Cepheid-based distance scale {which ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT    # 4298 PERIOD COVERED: UT February 12, 2007 (DOY 043) OBSERVATIONS SCHEDULED NIC2 10798 Dark Halos and Substructure from Arcs & Einstein Rings The surface brightness distribution of extended gravitationally lensed arcs and Einstein rings contains super-resolved information about the lensed object, and, more excitingly, about the smooth and clumpy mass distribution of the lens galaxies. The source and lens infor ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4297 PERIOD COVERED: UT February 09,10,11, 2007 (DOY 040,41,42) OBSERVATIONS SCHEDULED NIC1/NIC2/NIC3 8795 NICMOS Post-SAA calibration - CR Persistence Part 6 A new proceedure proposed to alleviate the CR-persistence problem of NICMOS. Dark frames will be obtained immediately upon exiting the SAA contour 23, and everytime a NICMOS exposure is scheduled within 50 minutes of coming out of the SAA. The darks will be obtained in ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT        # 4296 PERIOD COVERED: UT February 08, 2007 (DOY 039) OBSERVATIONS SCHEDULED NIC2 10858 NICMOS Imaging of the z ~ 2 Spitzer Spectroscopic Sample of Ultraluminous Infrared Galaxies We propose to obtain NICMOS images of the first large sample of high-z ultra-luminous infrared galaxies {ULIRGs} whose redshifts and physical states have been determined with Spitzer mid-IR spectra. The detection of strong ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4295 PERIOD COVERED: UT February 07, 2007 (DOY 038) OBSERVATIONS SCHEDULED NIC2 10858 NICMOS Imaging of the z ~ 2 Spitzer Spectroscopic Sample of Ultraluminous Infrared Galaxies We propose to obtain NICMOS images of the first large sample of high-z ultra-luminous infrared galaxies {ULIRGs} whose redshifts and physical states have been determined with Spitzer mid-IR spectra. The detection of strong silicate absorption and/or P ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4294 PERIOD COVERED: UT February 06, 2007 (DOY 037) OBSERVATIONS SCHEDULED WFPC2 10860 The largest Kuiper belt object The past year has seen an explosion in the discoveries of Pluto-sized objects in the Kuiper belt. With the discoveries of the methane-covered 2003 UB313 and 2005 FY9, the multiple satellite system of 2003 EL61, and the Pluto-Charon analog system of Orcus and its satellite, it is finally apparent that Pluto is ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4293 PERIOD COVERED: UT February 05, 2007 (DOY 036) OBSERVATIONS SCHEDULED NIC2 10858 NICMOS Imaging of the z ~ 2 Spitzer Spectroscopic Sample of Ultraluminous Infrared Galaxies We propose to obtain NICMOS images of the first large sample of high-z ultra-luminous infrared galaxies {ULIRGs} whose redshifts and physical states have been determined with Spitzer mid-IR spectra. The detection of strong silicate absorption and/or P ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4292 PERIOD COVERED: UT February 02,03,04, 2007 (DOY 033,034,035) OBSERVATIONS SCHEDULED WFPC2 11025 WFPC2 Cycle 15 CTE Monitor Monitor CTE changes during Cycle 15. Test for chip-to-chip differences in CTE. FGS 10927 The Weight-Watcher Program for Subdwarfs We propose to use HST/FGS1r to measure five subdwarf spectroscopic binaries to determine masses for the components. Their metallicities, [Fe/H], range from -0.5 to -2.5 ...Continue Reading