The WFPC2 B-Band parallel survey: a systematic and synoptic study of galaxy formation and evolution - Short Orbit Cases

Mathematics – Logic

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Hst Proposal Id #7202 Galaxies &Amp, Clusters

Scientific paper

We request up to 216 WFPC2 parallel orbits in Cycle 6 and 7 to begin a WFPC2 B-band parallel survey and make a synoptic study of galaxy formation and evolution. This will result in 24 fields of 8-12 orbits each { 6-8 in Bband and 1-2 in Vband & Iband} and another 24 fields of 4-7 orbits { 3-4 in B and 1 in V and/or I}, providing for the first time large -area WFPC2 coverage in B, yielding 10,000 field galaxies with 18.5 B 25 mag. These will be analyzed in conjunction with our ultradeep Bband images. The B-band parallel survey will provide good galaxy morphology and neural network classifications for 18.5 B 25 mag, and our Cycle 5 ultradeep survey for 24 B 26.5 mag. This will allow us to study the nature and evolution of the faint blue galaxy population in the B-filter where the excess of the faint galaxy counts is most pronounced. Specifically, the B-band parallel survey will allow us to study: {1} the B-band galaxy counts as a function of morphological type over the magnitude range 15 B 27 mag, and so provide strong constraints for galaxy evolution models; {2} the numerous compact blue {sub-galactic?} objects for Bcge 23-24 mag, and study their relation to galaxy formation; {3} B-band samples through an extensive program of ground-based follow-up to get their redshift distributions and LF's as function of type for B 24 mag; & {4} their sub-kpc restframe morphology and color gradients to constrain stellar populations and dust.

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