7532(  1) - 12/14/96 00:39  - [  0]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7532
                                                       Version: 1
                                                       Check-in Date: 13-Dec-1996
                                                                      18:17:41

1.Proposal Title:
Spatial Structures and Masses of Faint Field Galaxies
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2. Scientific Category   3. Proposal For  4. Cycle
COSMOLOGY                   AR               7
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5. Investigators
                                                                                     Contact?
    PI: David Koo                         Lick Observatory, University of
                                          California, Santa Cruz
   CoI: Garth Illingworth                 Lick Observatory, University of               N
                                          California, Santa Cruz
   CoI: Luc Simard                        Lick Observatory, University of               N
                                          California, Santa Cruz

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6. Abstract

We propose to analyze 80 B,V,I WFPC2 frames (GTO 5090, GO5449) that cover the deep
survey region (``Groth strip'') to study the evolution of faint field galaxies. Our
approach will be to extract detailed structural information, in addition to
morphology, for very faint (I <~ 25^m) field galaxies. The WFPC2 bands will provide
colors with high spatial resolution so that we can characterize the evolution of the
bulge, disk, nucleus, and other components separately. The Groth strip is ideally
matched to the FOV of the Keck 10-m faint object spectrographs, which allow multi-
slit observations of 30-75 targets at a single pointing. Existing Keck observations
of the Groth strip have already yielded redshifts, emission line ratios, metallicity
and age indices, velocity widths or rotation curves for over 200 galaxies. The
targets are as faint as I ~ 24.5 and have typical redshifts z ~ 1, well beyond
current non-Keck limits for field galaxies. The Keck velocity width and rotation
curve data, coupled with the HST sizes, yield masses and thus an unprecedented
opportunity to exploit the fundamental plane and the Tully-Fisher relations to
establish the degree of luminosity evolution. Our team has extensive experience and
tools for analyzing the HST images, and plan to continue to use Keck for acquiring
the vital spectroscopic data.
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  Data Distribution

  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
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  Email:                                                              ,
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                                                7532(  1) - 12/14/96 00:39  - [  1]

            Summary Form for Proposal  7532

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          COSMOLOGY
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