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Daily Report #4768
HUBBLE SPACE TELESCOPE - Continuing to collect World Class Science
DAILY REPORT****** #4768 PERIOD COVERED: 5am January 8 - 5am January 9, 2009 (DOY *************************** 008/1000z-009/1000z) OBSERVATIONS SCHEDULED WFPC2 11966 The Recent Star Formation History of SINGS Galaxies The Spitzer Legacy project SINGS provided a unique view of the current state of star formation and dust in a sample of galaxies of all Hubble types. This multi-wavelength view allowed the team to create current star formation diagnostics that are independent of the dust content and increased our understanding of the dust in galaxies. Even so, using the SINGS data alone we can only make rough estimates of the recent star formation history of these galaxies. The lack of high resolution observations (especially U-band and H-alpha) means that it is impossible to estimate the ages of young clusters. In addition, the low resolution of the Spitzer and ground-based observations means that what appear to be individual Spitzer sources can actually be composed of many individual clusters with varying ages. We need to know the ages, star formation histories, and extinction of these individual clusters to understand how these clusters form and age and thus influence the evolution of the galaxy. In this proposal we address this missing area of SINGS by obtaining high-resolution WFPC2 UBVI & H-alpha observations to not only accurately locate and determine the ages of the young stellar clusters in the actively star forming SINGS galaxies but to also address a variety of other scientific issues. Over 500 HST orbits and 500 hours of Spitzter observing time have been dedicated to observations of the SINGS sample. But the HST observations have not been systematic. By adding a relatively small fraction of this time for these requested observations, we will greatly enhance the legacy value of the SINGS observations by creating a uniform high resolution multi-wavelength HST archive that matches the quality of the lower resolution SINGS archive. WFPC2 11967 WFPC2 Imaging of the Lockman Hole In order to understand galaxy evolution and constrain theoretical models, we require both multiwavelength photometry (to robustly determine physical parameters such as star formation rates and stellar masses) and detailed morphological information. Galaxy morphology encodes crucial information about galaxy formation history and the physical processes that trigger star formation and AGN activity, and high-resolution imaging for large samples of galaxies is currently only obtainable with HST. The Lockman Hole has been the target of extensive multi-wavelength observations from the X-ray to the radio, and will be the target of the deepest wide-area blankfield thermal IR observations with Herschel, but currently lacks comprehensive HST imaging. We propose to obtain WFPC2 imaging of ~500 arcmin2 of the central region of the Lockman Hole in F606W and F814W, to a depth of V606~26.8 and I814~26. This imaging is crucial in order to characterize the sources detected at other wavelengths. FLIGHT OPERATIONS SUMMARY: Significant Spacecraft Anomalies: (The following are preliminary reports of potential non-nominal performance that will be investigated.) HSTARS: 11633 - REACQ(2,1,2) at 008/14:42:21 and 16:18:12 failed to RGA control. GSACQ(2,1,2) at 008/13:30:08 was successful. Observations affected: WFPC-2 #121-123, Proposal ID #11967. COMPLETED OPS REQUEST: 18370-2 - Adjust NCS CPL Setpoint to 17.0 deg C COMPLETED OPS NOTES: (None) *********************** SCHEDULED***** SUCCESSFUL FGS GSacq************** 06**************** 06 FGS REacq************** 08**************** 06 OBAD with Maneuver **** 28**************** 28 SIGNIFICANT EVENTS: (None) |
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