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Daily 3626
HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science
DAILY REPORT # 3626 PERIOD COVERED: DOY 155 OBSERVATIONS SCHEDULED ACS/HRC/WFC 10060 CCD Daily Monitor This program consists of basic tests to monitor, the read noise, the development of hot pixels and test for any source of noise in ACS CCD detectors. This programme will be executed once a day for the entire lifetime of ACS. ACS/WFC 9779 Giant Lya Halos Around High Redshift Radio Galaxies We propose to use the ACS + ramp filter to image the morphologies of several high redshift, giant Lya emission line halos associated with radio galaxies. High redshift radio galaxies are the likely precursors of the most massive elliptical galaxies known today. There is increasing evidence that they are forming in the centers of giant halos in overdense galaxy regions or `protoclusters'. The halos provide a unique diagnostic to study the formation of these massive galaxies and determine the importance of AGN/starburst feedback during this process. The capability of HST to resolve fine detail is essential for the interpretation of their complex morphologies. Our targets have also a number of Lya excess galaxies near the halos which fall within the field-of-view of the ACS + ramp filters. Our images will resolve these systems and we will investigate whether there is morphological evidence for starburst outflows. Starburst winds have been proposed as a source of heat and chemical enrichment for protoclusters, which may significantly affect their evolution. ACS/WFC 9891 A snapshot survey of rich stellar clusters in the Large and Small Magellanic Clouds Rich stellar clusters are vital to a wide variety of astrophysical research, from stellar evolution studies to the formation and evolution of galaxies. In this context, it is important to understand how rich star clusters form and evolve. The cluster systems in the LMC and SMC are particularly important in achieving this, because they are the only systems which contain clusters at all stages of evolution while being close enough to be studied as fully resolved stellar populations - although in general this requires the capabilities of HST. We have recently investigated the structural evolution of LMC and SMC clusters using archival WFPC2 data, and demonstrated a dramatic trend in the sizes of these clusters with age. We have shown that this trend likely represents genuine structural evolution in these clusters, although it is not clear whether we are observing a dynamical process or the signature of changing formation conditions. This result has implications for all astronomical research involving massive stellar clusters. To develop this work further requires the extension of our two samples, so that they are statistically quantifiable. This will allow a number of key questions regarding the structural evolution trend to be answered. We propose a two-colour ACS/WFC SNAP survey of rich Magellanic Cloud clusters to achieve this aim. The unique resolution and sensitivity of ACS/WFC is required for success, because of the crowded nature of the targets. The SNAP data will have a large number of additional applications, both to globular cluster and Magellanic Cloud research. NIC1/NIC2/NIC3 8792 NICMOS Post-SAA calibration - CR Persistence Part 3 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 in parallel in all three NICMOS Cameras. The POST-SAA darks will be non-standard reference files available to users with a USEAFTER date/time mark. The keyword 'USEAFTER=date/time' will also be added to the header of each POST-SAA DARK frame. The keyword must be populated with the time, in addition to the date, because HST crosses the SAA ~8 times per day so each POST-SAA DARK will need to have the appropriate time specified, for users to identify the ones they need. Both the raw and processed images will be archived as POST-SAA DARKSs. Generally we expect that all NICMOS science/calibration observations started within 50 minutes of leaving an SAA will need such maps to remove the CR persistence from the science images. Each observation will need its own CRMAP, as different SAA passages leave different imprints on the NICMOS detectors. STIS 9786 The Next Generation Spectral Library We propose to continue the Cycle 10 snapshot program to produce a Next Generation Spectral Library of 600 stars for use in modeling the integrated light of galaxies and clusters. This program is using the low dispersion UV and optical gratings of STIS. The library will be roughly equally divided among four metallicities, very low {[Fe/H] lt -1.5}, low {[Fe/H] -1.5 to -0.5}, near-solar {[Fe/H] -0.3 to 0.1}, and super-solar {[Fe/H] gt 0.2}, well-sampling the entire HR-diagram in each bin. Such a library will surpass all extant compilations and have lasting archival value, well into the Next Generation Space Telescope era. Because of the universal utility and community-broad nature of this venture, we waive the entire proprietary period. STIS/CCD 10018 CCD Dark Monitor-Part 2 Monitor the darks for the STIS CCD. STIS/CCD 10020 CCD Bias Monitor - Part 2 Monitor the bias in the 1x1, 1x2, 2x1, and 2x2 bin settings at gain=1, and 1x1 at gain = 4, to build up high-S/N superbiases and track the evolution of hot columns. WFPC2 10070 WFPC2 CYCLE 12 Supplemental Darks Part 2/3 This dark calibration program obtains 3 dark frames every day to provide data for monitoring and characterizing the evolution of hot pixels. FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated.) HSTAR 9434: GS Acquisition (2,1,1) @ 155/12:45:02Z LOL at 155/13:39:58Z, spacecraft was in SAA Level 2 contour during the LOL. Under investigation. HSTAR 9435: During ZOE, GS Acquisition (2,1,2) @ 155/18:03:24Z resulted in FL backup on FGS 2. Under investigation. HSTAR 9348: GS Acquisition (2,1,2) @ 156/02:14:06Z failed to RGA control at AOS 156/03:13:31Z, TDE. Four 486 ESB messages 'a0e' were observed when telemetry was acquired @ 156/03:13:31Z, indicating FGS Sequential Attitude update failed because roll error was too large to correct (QDVEFGS1 = 150.907 arcsec). Under investigation. COMPLETED OPS REQs: 17174-0 Continuous Engineering Recording for Battery #4 BCT @ 155/1427z 17178-0 K16ACLIM change @ 155/1353z 17179-0 GENSLEW pointing correction for prop 9987, slot 11 @ 155/1430z 17180-0 GENSLEW pointing corr for prop 9987, slot 12 @ 155/1432z 17181-0 GENSLEW ephemeris corr for prop 9985, slot 7 @ 155/1340z 17182-0 GENSLEW ephemeris corr for prop 9985, slot 8 @ 155/1345z 17183-0 GENSLEW ephemeris corr for prop 9985, slot 9 @ 155/1348z 17184-0 GENSLEW ephemeris correction for prop 9985, slot 10 @ 155/1349z OPS NOTES EXECUTED: 1238-0 Table 213 dump @ 155/1450z 1242-0 Adjust ACS Error Count Limit @ 156/0012z SCHEDULED SUCCESSFUL FAILURE TIMES FGS GSacq 12 11 156/02:14:06 FGS REacq 03 03 FHST Update 20 20 LOSS of LOCK SIGNIFICANT EVENTS: EPS SE FLASH REPORT -- The Battery 4 Capacity commenced at DOY 156/01:34 GMT Following the commanding, EPS SE verified nominal overall system performance with the system reaching trickle charge,and EPS FSW reset during orbit night. Placing Battery 4 back on-line in FSW is scheduled for June 4, DOY 156 at ~14:18 GMT (10:18 am local). EPS SE will monitor the system for two full orbits after the completion of the commanding. OTA SE FLASH REPORT -- Flash Report: FGS-2 K16 change On DOY 2004.155, Ops Request 17178 was successfully executed to change the K16ACLIM for FGS-2 from 12,335.625 a-s/sec/cycle to 4982.625 a-s/sec/cycle. Commanding was successfully completed ~ 155/13:54. OTA SE remained on console to monitor the successful GSAcq(1,2,2) at 14:36 and ReAcq(1,2,2) at 15:55. Target Reacquisition Capability Test 156/14:12:50Z - 16:03:04Z; driven entirely by SMS commanding (Proposal 10336). While the spacecraft remains under 3-gyro control, the capability to perform a 2-gyro target reacquisition is tested while STIS takes normal science data over a period of two orbits. |
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