9956(  1) - 04/04/03 10:37  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9956
                                                       Version: 1
                                                       Check-in Date: 04-Apr-2003
                                                                      10:36:12

1.Proposal Title:
Probing the Mass Distribution to High Redshift in the UDF
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2. Proposal For  3. Cycle
AR               11
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4. Investigators
                                                                                     Contact?
    PI: David Wittman                     Bell Labs
   CoI: Dr. Gillian Wilson                California Institute of Technology            N
   CoI: Dr. J. Tyson                      Bell Labs                                     N
   CoI: Dr. Andrew Becker                 Bell Labs                                     N
   CoI: Dr. Vera Margoniner               Bell Labs                                     N
   CoI: Dr. Ian Dell'Antonio              Brown University                              N
   CoI: Dr. Gordon Squires                California Institute of Technology            N
   CoI: Dr. Jason Rhodes                  California Institute of Technology            N

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5. Abstract

We propose to study two aspects of galaxy mass assembly using galaxy-galaxy lensing
in the Ultra Deep Field (UDF): evolution of galaxy mass and mass-to-light ratio
(M/L) with cosmic time, and mass profiles in the inner 1-10 kpc. The UDF data will
enable detection of changes in the average galaxy mass of as little as 10% from 11
Gyr ago to now. The mean mass profile will also be tightly constrained over the same
range of lookback times. Lensing probes all types of galaxies equally well, and the
large-number statistics will easily support subdivision into various galaxy types.
Our data products will be a calibrated set of galaxy mass evolution results to
complement the more traditional galaxy luminosity/number/type evolution results
which will undoubtedly spring from the UDF, plus an independent photometric-redshift
catalog of the UDF and mass maps of the 30' x 30' area surrounding the UDF.
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                                                9956(  1) - 04/04/03 10:37  - [  2]

            Summary Form for Proposal  9956

  Item                         Used in this proposal
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  Proposal Category            AR
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