NASA Hubble Space Telescope Daily Report #4367
Notice: For the foreseeable future, the daily reports may contain apparent discrepancies between some proposal descriptions and the listed instrument usage. This is due to the conversion of previously approved ACS WFC or HRC observations into WFPC2, or NICMOS observations subsequent to the loss of ACS CCD science capability in late January.
HUBBLE SPACE TELESCOPE DAILY REPORT # 4367
– Continuing to collect World Class Science
PERIOD COVERED: UT May 21, 2007 (DOY 141)
OBSERVATIONS SCHEDULED
WFPC2 10800
Kuiper Belt Binaries: Probes of Early Solar System Evolution
Binaries in the Kuiper Belt are a scientific windfall: in them we have relatively fragile test particles which can be used as tracers of the early dynamical evolution of the outer Solar System. We propose to continue a Snapshot program using the ACS/HRC that has a demonstrated discovery potential an order of magnitude higher than the HST observations that have already discovered the majority of known transneptunian binaries. With this continuation we seek to reach the original goals of this project: to accumulate a sufficiently large sample in each of the distinct populations collected in the Kuiper Belt to be able to measure, with statistical significance, how the fraction of binaries varies as a function of their particular dynamical paths into the Kuiper Belt. Today’s Kuiper Belt bears the imprints of the final stages of giant-planet building and migration; binaries may offer some of the best preserved evidence of that long-ago era.
WFPC2 10832
Solving the microlensing puzzle: An HST high-resolution imaging approach
We propose to use the HST Advanced Camera for Surveys High Resolution Channel to obtain high resolution imaging data for 10 bona-fide LMC microlensing events seen in the original MACHO survey. The purpose of this survey will be to assess whether or not the lens and source stars have separated enough to be resolved since the original microlensing event took place – about a decade has passed since the original MACHO survey and the HST WFPC2 follow-up observations of the microlensing events. If the components of the lensing event are resolved, we will determine the apparent magnitude and color of both the lens and the source stars. These data, in combination with Spitzer/IRAC data and Magellan near-IR JHK data, will be used to ascertain the basic properties of the lens stars. With the majority of the microlensing events in the original MACHO survey observed at the highest spatial resolution currently possible, we will be able to draw important conclusions as to what fraction of these events have lenses which belong to some population of dwarf stars in the disk and what fraction must be due to lenses in the halo or beyond. These data will greatly increase our understanding of the structure of the Galaxy by characterizing the stellar population responsible for the gravitational microlensing.
ACS/SBC 10862
Comprehensive Auroral Imaging of Jupiter and Saturn during the International Heliophysical Year
A comprehensive set of observations of the auroral emissions from Jupiter and Saturn is proposed for the International Heliophysical Year in 2007, a unique period of especially concentrated measurements of space physics phenomena throughout the solar system. We propose to determine the physical relationship of the various auroral processes at Jupiter and Saturn with conditions in the solar wind at each planet. This can be accomplished with campaigns of observations, with a sampling interval not to exceed one day, covering at least one solar rotation. The solar wind plasma density approaching Jupiter will be measured by the New Horizons spacecraft, and a separate campaign near opposition in May 2007 will determine the effect of large-scale variations in the interplanetary magnetic field {IMF} on the Jovian aurora by extrapolation from near-Earth solar wind measurements. A similar Saturn campaign near opposition in Jan. 2007 will combine extrapolated solar wind data with measurements from a wide range of locations within the Saturn magnetosphere by Cassini. In the course of making these observations, it will be possible to fully map the auroral footprints of Io and the other satellites to determine both the local magnetic field geometry and the controlling factors in the electromagnetic interaction of each satellite with the corotating magnetic field and plasma density. Also in the course of making these observations, the auroral emission properties will be compared with the properties of the near-IR ionospheric emissions {from ground- based observations} and non thermal radio emissions, from ground-based observations for Jupiter’s decametric radiation and Cassini plasma wave measurements of the Saturn Kilometric Radiation {SKR}.
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 PAH emission lines suggest that the these sources are a mixture of highly obscured starbursts, AGNs and composite systems at z=3D2. Although some of the spectra show PAH = emission similar to local starburst ULIRGs, their bolometric luminosities are roughly an order of magnitude higher. One important question is if major mergers, which are the trigger for 95% of local ULIRGs, also drive this enormous energy output observed in our z=3D2 sample. The NICMOS images will allow us to {1} measure surface brightness profiles of z~2 ULIRGs and establish if major mergers could be common among our luminous sources at these early epochs, {2} determine if starbursts and AGNs classified based on their mid-IR spetra would have different morphological signatures, thus different dynamic state; {3} make comparisons with the similar studies of ULIRGs at z ~ 0 – 1, thus infer any evolutionary connections between high-z ULIRGs and the formation of normal, massive galaxies and quasars observed today.
WFPC2 10880
The host galaxies of QSO2s: AGN feeding and evolution at high luminosities
Now that the presence of supermassive black holes in the nuclei of galaxies is a well established fact, other questions related to the AGN phenomena still have to be answered. Problems of particular interest are how the AGN gets fed, how the black hole evolves and how the evolution of the black hole is related to the evolution of the galaxy bulge. Here we propose to address some of these issues using ACS/WFC + F775W snapshot images of 73 QSO2s with redshifts in the range 0.3 WFPC2 CYCLE 15 INTERNAL MONITOR This calibration proposal is the Cycle 15 routine internal monitor for WFPC2, to be run weekly to monitor the health of the cameras. A variety of internal exposures are obtained in order to provide a monitor of the integrity of the CCD camera electronics in both bays {both gain 7 and gain 15 — to test stability of gains and bias levels}, a test for quantum efficiency in the CCDs, and a monitor for possible buildup of contaminants on the CCD windows. These also provide raw data for generating annual super-bias reference files for the calibration pipeline. NIC1/NIC2/NIC3 8794 NICMOS Post-SAA calibration – CR Persistence Part 5 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=3Ddate/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. WFPC2 11023 WFPC2 CYCLE 15 Standard Darks – part 1 This dark calibration program obtains dark frames every week in order to provide data for the ongoing calibration of the CCD dark current rate, and to monitor and characterize the evolution of hot pixels. Over an extended period these data will also provide a monitor of radiation damage to the CCDs. FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated.) HSTARS: 10820 – GSAcq (1,2,2) failed to RGA Hold (Gyro Control) AT AOS (141/13:29:30) GSAcq (1,2,2) had failed to RGA Hold (Gyro Control) due to QSTOP flag on FGS 1. OBAD #1 unavailable due to LOS OBAD #2 RSS: 15.84 10821 – ACS 779 Fold Mechanism Move was Blocked At 141/13:31:24 “Fold Mechanism Move Was Blocked P=3D0, = T=3D1001. This was the result of the failed GSAcq at 13:22:49 so the TDF was down when the fold mechanism move to the SBC position was commanded. The move is blocked and SBC MAMA HV will remain on. The MAMA HV staying on is a new feature for ACS FSW CS4.01. 10824 – FHST OBAD1 Failure During LOS OBAD1 scheduled at 142/04:18:07 using trackers 1 and 2 failed. Subsequent OBAD2 and guide star acquisition was successful. 10825 – REacq(1,2,1) failed due to search radius limit exceeded During LOS REacq(1,2,1) scheduled at 142/06:06:34 failed due to search radius limit exceeded on FGS 1. COMPLETED OPS REQUEST: 18083-1 – MSS/Gyro2 Initialization Test#35 @141/1301z 18084-0 – MSS/Gyro1 Initialization Test#11 @141/2126z 18085-0 – PCS KF OOT Support,141/1302z 18086-0 – PCS KF OOT Support,141/2134z COMPLETED OPS NOTES: (None) SIGNIFICANT EVENTS: Evaluation of Universal Kalman Filter performance continued. Multiple text segments were executed, all of them successfully. Details follow. The KF was halted at 141/12:48. It was restarted at 141/12:50 with the MSS and Gyro2 sensor inputs enabled. The initialization occurred during orbit day with the CSS input disabled. The initialization was executed during a vehicle slew and during a slow changing B-field. All UKF parameters showed nominal operation. The test was an MSS/Gyro2 Initialization test case during a slow changing B-field (M_G2_IVS, Test #35). The filter was reconfigured back to MSS only input at 141/13:00. The KF was halted at 141/21:24. It was restarted at 141/21:26 with the MSS and Gyro1 sensor inputs enabled. The initialization occurred during orbit day with the CSS input disabled. The initialization was executed during a vehicle slew and during a fast changing B-field. All UKF parameters showed nominal operation. The test was an MSS/Gyro1 Initialization test case during a fast changing B-field (M_G1_IVF, Test #11). The filter was reconfigured back to MSS only input at 141/22:06.
SCHEDULED SUCCESSFUL
FGS GSacq 09 07
FGS REacq 03 03
OBAD with Maneuver 24 23
