10298(  1) - 04/02/04 11:20  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      10298
                                                       Version: 1
                                                       Check-in Date: 02-Apr-2004
                                                                      11:20:03

1.Proposal Title:
Structural Evolution of Galaxies with GOODS and the Ultra-Deep Field
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2. Proposal For  3. Cycle  4. Parallel Pointing Tolerance
AR               13        <none>
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5. Investigators
                                                                                     Contact?
    PI: Dr. Seth H. Cohen                 Arizona State University
   CoI: Dr. Rogier A. Windhorst           Arizona State University                      N
   CoI: Dr. Stephen C. Odewahn            University of Texas at Austin                 N
   CoI: Mr. Nimish P. Hathi               Arizona State University                      N

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6. Abstract

We propose to study the evolution of the internal structure of galaxies for z<2. We
will use existing ACS archival data from the two GOODS fields, along with the Hubble
Ultra-Deep Field (UDF). We will take maximal advantage of image depth and
resolution, and use all four BVi'z' bands along with the wealth of available
spectroscopic and photometric redshifts in these fields. We propose to: (1) Utilize
our U-band database of over 300 nearby galaxies of all types and inclinations to
calibrate quantitative structural measurements of these ACS images of galaxies with
z<2 and take advantage of the multiband aspect of the Archival ACS data. (2) Apply a
fully two dimensional Fourier Decomposition technique to quantify the existence of
structural features (types of spiral features and bars or lack thereof) as a
function of redshift to trace to formation of the present day Hubble sequence. (3)
Use the deeper UDF images to study the reliability of such measurements over the
wider GOODS fields and to push these measurements to fainter flux levels only where
it can be justified using what is learned in (1). (4) Produce and distribute a
catalog of our results.
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                                                10298(  1) - 04/02/04 11:20  - [  2]

            Summary Form for Proposal  10298

  Item                         Used in this proposal
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  Proposal Category            AR
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