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Daily 3773
HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science DAILY REPORT******* # 3773 PERIOD COVERED: DOY 010 OBSERVATIONS SCHEDULED ACS/HRC 10377 ACS Earth Flats High signal 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 used by the pipeline and will provide a comparison with flats derived via other techniques: L-flats from stellar observations, sky flats from stacked GO observations, and internal flats using the calibration lamps. Weekly coronagraphic monitoring is required to assess the changing position of the spots. ACS/HRC/WFC 10367 ACS CCDs daily monitor- cycle 13 - part 1 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 entire lifetime of ACS. ACS/HRC/WFC 10425 ACS Coronagraphic Imaging of Herbig Ae/Be Stars We can indirectly learn about the planet formation process by studying proto-planetary dust disks. In this proposed observational program, we focus on Herbig Ae/Be stars which are pre-main sequence intermediate mass stars {2-10 solar masses} thought to be immediate precursors to the Vega-excess stars like Beta Pictoris. We propose to take ACS coronagraphic images in the F606W filter of 6 Herbig Ae/Be stars, all of which have well constrained spectral energy distributions and are nearby {200pc}, suggesting possible disk sizes of 3" or larger in radius. We use the recent ACS coronagraph image of Herbig Ae/Be star, HD 141569, which shows a spectacular circumstellar disk, as a template for observing strategy and exposure time estimates. Our observing program involves contemporaneous comparison stars that will be used to subtract the point spread function. These images will constrain the size and possibly, the morphology of the circumstellar dust that may have disk, envelope or disk+envelope geometries. We will analyze these images quantitatively using 2-Dust, an axisymmetric radiative transfer dust code, to derive basic physical parameters of the dusty circumstellar matter such as mass, size, geometry, inclination angle and grain properties. ACS/WFC 10181 ACS/NICMOS Imaging of Bright Lyman Break Galaxy Candidates from SDSS The recent surprising discovery of six unusually bright {r~20 mag} Lyman break galaxy {LBG} candidates with z=2.45-2.80 in the Sloan Digital Sky Survey {SDSS} raises a number of questions that only HST can address. Specifically, what is the true nature of these objects, and what role if any is played by gravitational lensing? We propose to use the superior resolution and sensitivity of ACS and NICMOS to obtain deep images of these objects and their environments. Compared to SDSS images, HST will allow us to determine their morphologies {extended, point-source, or lensed}, the appearance of their environments {rich or poor}, and to detect any faint foreground groups or clusters that might be responsible for lensing these objects. All outcomes would be intriguing. If the objects are lensed, it increases from 1 {MS1512-cB58} to 7 the number of normal LBGs bright enough to study individually. If they are instead unlensed point sources, they will represent a new class of previously unidentified absorption-line quasars. Finally, if they are unlensed and extended star-forming galaxies, they are at least 4mag brighter than L_* LBGs, thus making them the most luminous star-forming objects yet seen, representing a heretofore unknown extreme population of objects. ACS/WFC/WFPC2 10242 Pre-History of a Starburst: Deep Imaging of IC 10 The peculiar Local Group dwarf galaxy IC 10 is the nearest case of a starburst in progress. Starburst galaxies are a prime laboratory for studying the physical processes which regulate star formation in galaxies; as the closest example, IC 10 is potentially the key galaxy for understanding the starburst phenomenon. We propose to obtain deep optical images of IC 10 with the ACS/WFC to achieve three main goals: 1} To make the first estimates of the pre-burst history of IC 10 based on morphological and statistical analysis of its {V, I} color- magnitude diagram; 2} to search for evidence of a past history of burst-dormancy cycles; and 3} to explore the connection between the ages and locations of bright stars and the large-scale structure of the interstellar medium. The distance {0.8 Mpc}, extinction {2.5 mag}, and high surface brightness of IC 10 make these goals unobtainable except with HST. The observations proposed here will yield far and away the deepest images, in absolute magnitudes, ever obtained for any starburst galaxy. Our photometry will reach to magnitudes {V, I} = {28.5, 27.5}, which is below the level of the red clump/horizontal branch and the location of the main-sequence turnoff of stars as old as a billion years. For the first time, it will be possible to measure the detailed history of a starburst host for the Gigayear time period leading up to the burst. The horizontal branch morphology and colors will provide new information on the metallicity and age distribution of stars spanning the entire age of IC 10. Because of its close distance, IC 10 is the ONLY starburst galaxy for which this type of information is obtainable now or in the next decade. We propose to use WFPC2 in parallel to search for a low-surface brightness population associated with the neutral gas filaments surrounding IC 10. ACS/WFC/WFPC2 10402 The Formation and Evolution of Spirals: An ACS and WFPC2 Imaging Survey of Nearby Galaxies Over 50% of galaxies in the local universe are spirals. Yet the star formation histories and evolution of this crucial population remain poorly understood. We propose to combine archival data with new ACS/WFC and WFPC2 observations of 11 galaxies, to tackle a comprehensive investigation of nearby spirals covering the entire spiral sequence. The new observations will fill a serious deficiency in HST's legacy, and maximize the scientific return of existing HST data. The filter combination of UBVI, and Halpha is ideal for studying stellar populations, dust properties, and the ISM. Our immediate scientific objectives a {i} to use the resolved cluster populations, both young massive clusters and ancient globular clusters as a chronometer, to understand how spirals assembled as a function of time; {ii} study the rapid disruption properties of young clusters; and {iii} understand dust distributions in spirals from pc to kpc scales. Each of these goals provides an important step towards charting the evolution of galaxies, and an essential baseline for interpreting the galaxy populations being surveyed in both the early and present universe. The resolution of our survey, which exploits the excellent imaging capabilities of HST's two optical cameras, will enable us to understand the record of star cluster, and galaxy formation in a level of detail which is not possible for more distant systems. Finally, the proposed observations will provide a key to interpret an extensive, multiwavelength archive of space- and ground- based data at lower spatial resolution {SPITZER, CHANDRA, GALEX, NICMOS P alpha and H band imaging} for local spirals. NIC3/WFPC2 10403 Ultraviolet Imaging of the UDF The Hubble Deep Field North has uninterrupted observations at wavelengths from Far-UV through NICMOS H- band, but the UDF goes no bluer than B-band. We propose to complete the UDF coverage with deep ultraviolet imaging of the Ultra-Deep Field {UDF} with the ACS-SBC in the Far-UV {1500 Angstrom} and WFPC2 in the Near-UV {F300W}. We will reach point source limits of ABmag=28.5, a factor of ten fainter than the GALEX ultradeep surveys. Our dataset will add to the value of the UDF legacy, and requires the unique capabilities of HST. In the spirit of the UDF, we submit this proposal in the Treasury category. We request a modest allocation of observing time for a Treasury program: 62 orbits. We will provide science quality images and photometric catalogs to enable a range of research topics by the community. The science goals of the team are to investigate the episode of strong star formation activity in galaxies out to z=1, through the rest-frame FUV luminosity function and the internal color structure of galaxies. Far-UV number counts suggest that moderate redshift {z~0.5} starbursts are undergoing a single, rapid burst of star-formation. We will investigate this result by measuring the faint-end slope, alpha, of the luminosity function. We will measure the star formation properties of moderate redshift starburst galaxies and compare their morphologies in the UV, optical, and near-IR. This catalog of starbursts will also be important to the astronomical community in correlating unobscured star-formation with the sources detected in the Spitzer Space Telescope legacy observations of the field. With the high spatial resolution data, will set strict limits on the flux escaping in intermediate redshift {1z2} galaxies at wavelengths below the rest-frame Lyman limit, and thus infer the contribution of star forming galaxies at z~5 to the metagalactic ionizing radiation. NICMOS 8790 NICMOS Post-SAA calibration - CR Persistence Part 1. 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. WFPC2 10359 WFPC2 CYCLE 13 Standard Darks 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.) HSTAR 9653:* GS Acquisition (2,1,1) @ 011/08:14:11Z (during ZOE) failed to RGA control due to SRLE on FGS 1 and 2.* Prior FM Updates u1,3FM @ 011/07:53:46Z and 07:56:01Z had attitude errors V1 = 3.018, V2 = 5.004, and V3 = 26.089 and V1 = 5.360, V2 = 9.079, and V3 = 2.637 arcsec.* Subsequent GS Reacquisition (2,1,1) @ 011/09:47:38Z failed to RGA control. Under investigation. COMPLETED OPS REQs: 17360-0 - Null Genslew for Proposal 10425 - Slot 4 & 5 (No Commands) @ 010/20:44z 17361-0 - Null Genslew for Proposal 10409 - Slot 6 & 7 (No Commands) @ 010/21:14z OPS NOTES EXECUTED: 1296-0 - Raise EAXLK1T Upper Temperature Limit @ 010/20:15z *********************** SCHEDULED**** SUCCESSFUL*** FAILURE TIMES FGS GSacq*********** 08*********************** 07************ See Hstar # 9653 FGS REacq*********** 06*********************** 06 FHST Update********* 14*********************** 14 LOSS of LOCK SIGNIFICANT EVENTS: None |
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