7551(  1) - 09/30/99 14:48  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7551
                                                       Version: 1
                                                       Check-in Date: 30-Sep-1999
                                                                      14:48:00

1.Proposal Title:
IMAGE RECONSTRUCTION AND PHOTOMETRY OF THE HUBBLE DEEP FIELD
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2. Proposal For  3. Cycle
AR               7
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4. Investigators
                                                                                     Contact?
    PI: Amos Yahil                        State University of New York at Stony
                                          Brook
   CoI: Kenneth Lanzetta                  University at Stony Brook                     N
   CoI: Richard Puetter                   University of California at San Diego         N

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5. Abstract

By analyzing spectral energy distributions of galaxies detected in the HDF images we
have been able to determine redshift estimates and to identify a significant number
of candidate galaxies at very high redshifts. The distribution of the galaxies in
redshift, magnitude and size provides detailed information on their evolution, which
can be used to severely constrain scenarios of galaxy formation and the related
cosmological parameters. Galaxy modeling that we have done to date strongly favors
an Einstein--de Sitter cosmology (Omega=1, Lambda=0), although further evolutionary
scenarios need to be explored. The morphological classification carried out so far
by Ellis, van den Bergh and collaborators on the HDF images can be extended to
fainter magnitudes and is expected to yield a visual time-line of galaxy formation.
This proposal seeks significant improvement in the database used for these studies.
We propose to carry out full pixon reconstructions of the entire HDF images, done
directly on the dithered exposures, to provide about a factor of two improvement in
resolution, giving detailed views of forming galaxies on scales ~ 0.05 arcsecs with
good S/N, corresponding to linear scales <~ 250 h^-1 pc. The reconstructions will
also improve image--noise separation leading to significant improvements in
photometry. Accurate photometry is crucial in order to pinpoint the redshifts,
determined by computing the effect of the Lyman limit and Ly-alpha\ and Ly-beta\
forests on the spectral energy distributions of different galaxy types.
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                                                7551(  1) - 09/30/99 14:48  - [  2]

            Summary Form for Proposal  7551

  Item                         Used in this proposal
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  Proposal Category            AR
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