HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4203 PERIOD COVERED: UT September 20, 2006 (DOY 263) OBSERVATIONS SCHEDULED ACS/HRC 10556 Neutral Gas at Redshift z=0.5 Damped Lyman-alpha systems {DLAs} are used to track the bulk of the neutral hydrogen gas in the Universe. Prior to HST UV spectroscopy, they could only be studied from the ground at redshifts z>1.65. However, HST has now permitted us to discover 41 DLAs at z 2.3 along the lines of sight. The survey has thr ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4202 PERIOD COVERED: UT September 19, 2006 (DOY 262) OBSERVATIONS SCHEDULED ACS/SBC 10872 Lyman Continuum Emission in Galaxies at z=1.2 Lyman continuum photons produced in massive starbursts may have played a dominant role in the reionization of the Universe. Starbursts are important contributors to the ionizing metagalactic background at lower redshifts as well. However, their contribution to the background depends upon the ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4201 PERIOD COVERED: UT September 18, 2006 (DOY 261) OBSERVATIONS SCHEDULED ACS/HRC 10738 Earth Flats Sky flats will be obtained by observing the bright Earth with the HRC and WFC. These observations will be used to verify the accuracy of the flats currently in the pipeline and to monitor any changes. Weekly coronagraphic monitoring is required to assess the changing position of the spots. ACS/HRC/WFC 10758 ACS CCDs daily m ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4200 PERIOD COVERED: UT September X15,16,17, 2006 (DOY 258,259,260) OBSERVATIONS SCHEDULED NIC1/NIC2/NIC3 8793 NICMOS Post-SAA calibration - CR Persistence Part 4 A new procedure proposed to alleviate the CR-persistence problem of NICMOS. Dark frames will be obtained immediately upon exiting the SAA contour 23, and every time a NICMOS exposure is scheduled within 50 minutes of coming out of the SAA. The darks will be obtained ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4199 PERIOD COVERED: UT September 14, 2006 (DOY 257) OBSERVATIONS SCHEDULED ACS/WFC 10881 The Ultimate Gravitational Lensing Survey of Cluster Mass and Substructure We propose a systematic and detailed investigation of the mass, substructure, and thermodynamics of one hundred X-ray luminous galaxy clusters at 0.151} cluster samples. For this ultimate cluster survey, we request ACS SNAPSHOTS through the F606W filter drawn from ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4198 PERIOD COVERED: UT September 13, 2006 (DOY 256) OBSERVATIONS SCHEDULED SIGNIFICANT EVENTS: (None) ACS/HRC/WFC 10758 ACS CCDs daily monitor This program consists of a set of basic tests to monitor, the read noise, the development of hot pixels and test for any source of noise in ACS CCD detectors. The files, biases and dark will be used to create reference files for science calibration. This programme will be for the enti ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4197 PERIOD COVERED: UT September 12, 2006 (DOY 255) OBSERVATIONS SCHEDULED ACS/HRC 10556 Neutral Gas at Redshift z=0.5 Damped Lyman-alpha systems {DLAs} are used to track the bulk of the neutral hydrogen gas in the Universe. Prior to HST UV spectroscopy, they could only be studied from the ground at redshifts z>1.65. However, HST has now permitted us to discover 41 DLAs at z1} cluster samples. For this ultimate cluster su ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4196 PERIOD COVERED: UT September 11, 2006 (DOY 254) OBSERVATIONS SCHEDULED ACS/HRC 10556 Neutral Gas at Redshift z=0.5 Damped Lyman-alpha systems {DLAs} are used to track the bulk of the neutral hydrogen gas in the Universe. Prior to HST UV spectroscopy, they could only be studied from the ground at redshifts z>1.65. However, HST has now permitted us to discover 41 DLAs at z If the above URL is inoperable, make sure that ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4195 PERIOD COVERED: UT September 08,09,10, 2006 (DOY 251,252,253) OBSERVATIONS SCHEDULED NIC1/NIC2/NIC3 8793 NICMOS Post-SAA calibration - CR Persistence Part 4 A new procedure proposed to alleviate the CR-persistence problem of NICMOS. Dark frames will be obtained immediately upon exiting the SAA contour 23, and every time a NICMOS exposure is scheduled within 50 minutes of coming out of the SAA. The darks will be obtained ...Continue Reading

HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT # 4194 PERIOD COVERED: UT September 07, 2006 (DOY 250) OBSERVATIONS SCHEDULED ACS/HRC 10563 Accurate dark-matter mass profiles in 3 elliptical galaxies as a test of CDM A critical test of the successful Lambda-CDM picture for structure formation is the measurement of the power law exponent, gamma, of the centre of dark matter density profiles, predicted to lie in the range 1.0-1.5. Measurements of gamma derived from rotation cu ...Continue Reading