8381(  2) - 12/18/98 16:54  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      8381
                                                       Version: 2
                                                       Check-in Date: 18-Dec-1998
                                                                      16:52:52

1.Proposal Title:
Quantitative NICMOS Structural Parameters of Galaxies in the Hubble Deep Field -
North
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2. Proposal For  3. Cycle
AR               8
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4. Investigators
                                                                                     Contact?
    PI: David C. Koo                      Lick Observatory, University of California
   CoI: Dr. Luc Simard                    Lick Observatory, University of California    N
   CoI: Dr. Francine Marleau              Departement of Astronomy, University of       N
                                          California, Berkeley
   CoI: Dr. Nicole Vogt                   Lick Observatory, University of California    N
   CoI: Dr. James D. Lowenthal            University of Massachusetts - Amherst         N

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5. Abstract

The Hubble Deep Field - North (HDF-N) is an unquestionably unique laboratory for
studying the formation and evolution of distant galaxies. We propose to analyze all
the galaxies in the complete NICMOS map of the HDF-N with a PSF-convolved
``bulge/disk'' surface brightness model. These quantitative structural measurements
in the near-infrared will be combined with WFPC2 optical measurements to answer four
basic questions: (1) Are the underlying structures of distant galaxies significantly
altered (or even hidden) by dust and star formation to which optical images are
particularly sensitive? (2) How do dynamical masses seen in recent Keck measurements
of internal kinematics of distant galaxies compare with total masses of old stars in
the near-IR? (3) Is the paucity of elliptical galaxies seen in the HDF-N due to dust
or late hierarchical galaxy formation? (4) What are the spatially resolved age and
star formation histories of HDF-N galaxies? The proposed archival work will be an
essential part of the structural and kinematical HDF-N dataset we currently have in
hand, and the results will guide our future Keck efforts.
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  Data Distribution

  Paper Products:  NO
  Media:           ELECTRONIC
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:
  Email:
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                                                8381(  2) - 12/18/98 16:54  - [  2]

            Summary Form for Proposal  8381

  Item                         Used in this proposal
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  Proposal Category            AR
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