5790(  0) - 07/18/95 18:00  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      5790
                                                       Version: **********
                                                       Check-in Date: **********

1.Proposal Title:
Tracking the Red Envelope: Elliptical Galaxy Evolution in High Redshift Galaxy
Clusters
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2. Scientific Category   3. Proposal For  4. Cycle
Galaxies & Clusters         AR               5
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5. Investigators
                                                                                     Contact?
    PI: Peter Eisenhardt                  Jet Propulsion Laboratory/California
                                          Institute of Technology
   CoI: Adam Stanford                     Jet Propulsion Laboratory/California          N
                                          Institute of Technology
   CoI: Mark Dickinson                    Space Telescope Science Institute             N

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6. Abstract

We propose to obtain images of 12 high redshift galaxy clusters from the HST
Archive. We have obtained deep, wide- field near-IR imaging of these clusters as
part of our survey of ~30 rich clusters up to z=1.0. The primary goal of our near -
IR imaging survey is to study the evolution of the elliptical galaxy population as a
function of redshift in galaxy clusters.  The high spatial resolution of HST imaging
enables us to determine morphological types for high redshift galaxies.  We will use
WFPC2 images of our clusters from the Archive to extract elliptical subsamples from
our near-IR selected galaxy catalogs on the basis of their HST morphology rather
than on the basis of an assumed red color. The resulting elliptical samples,
unbiased by optical color selection effects, will allow us to study the color
evolution of ellipticals to z=1 and test the passive evolution scenario. By
comparing the change in the mean colors of the ellipticals with spectral synthesis
models over a lookback time of ~10 Gyr we hope to be able to synchronize the
cosmological and stellar evolutionary clocks.
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  Observations Description
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  Real Time Justification
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  Calibration Justification
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  Additional Comments
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                                                5790(  0) - 07/18/95 18:00  - [  2]

  Data Distribution

  Media:           8MM
  Blocking Factor: 10
  Ship To:         PI_Address
  Ship Via:        UPS
  Email:                                                              ,
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                                                5790(  0) - 07/18/95 18:00  - [  3]

            Summary Form for Proposal  5790

  Item                         Used in this proposal
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  Proposal Category            AR
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  Scientific Category          Galaxies & Clusters
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