7534(  1) - 12/14/96 00:42  - [  0]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      7534
                                                       Version: 1
                                                       Check-in Date: 13-Dec-1996
                                                                      18:18:13

1.Proposal Title:
Fourier-Based Neural Network Galaxy
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2. Scientific Category   3. Proposal For  4. Cycle
GALAXIES                    AR               7
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5. Investigators
                                                                                     Contact?
    PI: Stephen C. Odewahn                Arizona State University
   CoI: Rogier Windhorst                  Arizona State University, Tempe               N

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6. Abstract

We propose to measure high quality morphological types of faint galaxies in 36 deep
WFPC2 fields using unique new methods of neural network classification based on two-
dimensional Fourier reconstructions of galaxy light distributions. We estimate that
~ 9000 galaxies will be automatically classified, producing morphological number
counts with errors 10\ Specifically, we will: \n o Carry out a systematic analysis
of the morphological properties of local and distant galaxies by quantitatively
measuring global galaxy asymmetries as a function of cosmic epoch, and in the
process develop new two-dimensional Fourier-based neural network classification
systems capable of detecting and quantifying bar and ring features. \n o Improve
isophotal ellipse fitting with Fourier rejection methods and create a large database
to confirm our recent finding that highly flattened galaxies are rare at
\Iband\cge23 (or z\cge1) relative to local, possibly indicating the epoch of disk
formation. \n o Investigate the nature of secular evolution of galaxies by analyzing
-- using images in a consistent rest- frame --- the frequency and properties of
morphological features, such as bars and rings, over a wide range of cosmic epochs.
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  Data Distribution

  Media:           ELECTRONIC
  Blocking Factor: 10
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                                                7534(  1) - 12/14/96 00:42  - [  1]

            Summary Form for Proposal  7534

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          GALAXIES
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