7531(  1) - 12/14/96 00:36  - [  0]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7531
                                                       Version: 1
                                                       Check-in Date: 13-Dec-1996
                                                                      18:17:17

1.Proposal Title:
The Nature of Galaxies in the HDF from HST Structural and Keck Kinematical
Measurements
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2. Scientific Category   3. Proposal For  4. Cycle
COSMOLOGY                   AR               7
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5. Investigators
                                                                                     Contact?
    PI: Garth Illingworth                 Lick Observatory, University of
                                          California, Santa Cruz
   CoI: Sandra Faber                      Lick Observatory, University of               N
                                          California, Santa Cruz
   CoI: David Koo                         Lick Observatory, University of               N
                                          California, Santa Cruz
   CoI: Andrew Phillips                   Lick Observatory, University of               N
                                          California, Santa Cruz

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6. Abstract

We propose to extend our program to characterize the evolution of galaxies in the
HDF and its flanking fields. The key to this goal is combining detailed structural
information from the HST HDF images with kinematical data from Keck multislit,
spectroscopic observations with LRIS. HDF, with its flanking fields, is ideally
matched to the 5'*7' field of LRIS. Spectra of 115 HDF and flanking field galaxies
to I ~25 mag were obtained in Cycle 6 and combined with detailed structural
measurements from the HDF images to (i) derive evolution for a sample of disk
galaxies at z~0.5 using the Tully-Fisher relation, (ii) characterize, from size and
velocity width data, the global properties to z~ 1 of a sample of ~60 ``compact''
galaxies, (iii) determine star formation rates in that ``compact'' sample, and (iv)
derive structure and redshifts for a sample of U and B-band ``dropout'' objects, of
which 11 have been confirmed to be at high redshift (z=2.2- 3.5). As we have
demonstrated in the (four) papers detailing these results, the HST length scale,
surface brightness and morphological data provide an unprecedented opportunity to
characterize the nature of distant galaxies, when combined with Keck redshifts,
velocity width and rotation curve data, particularly with relations such as the
Fundamental Plane and Tully-Fisher. We request support to extend this program to a
substantially larger sample of objects within the HDF fields.
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  Data Distribution

  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
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                                                7531(  1) - 12/14/96 00:36  - [  1]

            Summary Form for Proposal  7531

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          COSMOLOGY
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