8357(  2) - 12/18/98 16:45  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      8357
                                                       Version: 2
                                                       Check-in Date: 18-Dec-1998
                                                                      16:43:21

1.Proposal Title:
Rest-frame Galaxy Morphology at Intermediate to High Redshifts Using Archival NICMOS
Images
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2. Proposal For  3. Cycle
AR               8
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4. Investigators
                                                                                     Contact?
    PI: Ian Waddington                    Arizona State University
   CoI: Prof. Rogier Windhorst            Arizona State University                      N
   CoI: Mr. Seth Cohen                    Arizona State University                      N
   CoI: Dr. Stephen Odewahn               California Institute of Technology            N

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5. Abstract

\n We propose to investigate the observed infrared morphology of ~10^4 faint
galaxies at intermediate to high redshifts observed in ~160 shallow--deep NICMOS H-
band images, which sample the restframe optical. Artificial Neural Networks that are
well trained on lower redshift WFPC2 BVRI images will provide reliable
classifications for H 26.5--27 mag. We will then address the following science
goals: noindent (1) Determine the galaxy counts as as function of accurately
determined morphological type, providing strong constraints on galaxy evolution
models well beyond levels where these can be measured spectroscopically from the
ground; noindent (2) Measure the epoch and type-dependent luminosity distribution
N(z, mag, type) in the multicolor HDF images, which will directly constrain the
evolution of the different Hubble types with cosmic time and trace the physical
cause of this evolution at z~1--3; noindent (3) Study the numerous compact objects
at faint magnitudes, their size distribution compared with that of nearby galaxies
in the restframe optical, and their role in galaxy formation; noindent (4) Provide
stronger constraints on cosmological parameters (e.g.\ the cosmological constant)
from the counts of well classified E/S0's, which cannot be done through the optical
counts since the uncertain restframe UV morphology affects the classifications.
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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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                                                8357(  2) - 12/18/98 16:45  - [  2]

            Summary Form for Proposal  8357

  Item                         Used in this proposal
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  Proposal Category            AR
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