10303(  1) - 04/02/04 11:27  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      10303
                                                       Version: 1
                                                       Check-in Date: 02-Apr-2004
                                                                      11:27:32

1.Proposal Title:
Extremely Red Galaxies at z > 1 in the COSMOS 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. Lin Yan                       Jet Propulsion Laboratory
   CoI: Dr. James Colbert                 California Institute of Technology            N
   CoI: Dr. Harry Teplitz                 Jet Propulsion Laboratory                     N
   CoI: Dr. Patrick J. McCarthy           Carnegie Institution of Washington            N
   CoI: Dr. Igor Drozdovsky               California Institute of Technology            N
   CoI: Dr. Matthew A. Malkan             University of California - Los Angeles        N

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6. Abstract

We propose to identify the population of extremely red galaxies (EROs) in the COSMOS
treasury dataset, by combining the primary F814W images with their NICMOS F160W
parallels. COSMOS parallels with NICMOS provide an unprecedented combination of
extraordinary depth (Vega=24), area coverage (200 sq. arcmin) and spatial
resolution. The ERO selection will be limited by the F814W depth, so the entire red
galaxy sample will consist of high significance detections suitable for quantative
morphological analysis. We will measure the surface density of red galaxies (I-H >
3) fainter than current ground-based surveys can detect in order to determine
whether the counts flatten beyond H=20.5. We will establish whether the large disk
fraction (60%) seen in the optical holds true in near-infrared morphologies. And we
will determine whether ERO clustering strength has any morphological dependence.
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                                                10303(  1) - 04/02/04 11:27  - [  2]

            Summary Form for Proposal  10303

  Item                         Used in this proposal
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  Proposal Category            AR
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