9929(  1) - 04/04/03 10:21  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9929
                                                       Version: 1
                                                       Check-in Date: 04-Apr-2003
                                                                      10:20:56

1.Proposal Title:
The Astrophysics of Star Formation & Galaxy Building in the Middle Ages: z ~ 0 to 2
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2. Proposal For  3. Cycle
AR               11
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4. Investigators
                                                                                     Contact?
    PI: Timothy Heckman                   The Johns Hopkins University
   CoI: Prof. Christopher Martin          California Institute of Technology            N
   CoI: Dr. David Schiminovich            California Institute of Technology            N
   CoI: Dr. Gerhardt Meurer               The Johns Hopkins University                  N
   CoI: Prof. Alexander Szalay            The Johns Hopkins University                  N
   CoI: Dr. Tamas Budavari                The Johns Hopkins University                  N
   CoI: Dr. Charles Hoopes                The Johns Hopkins University                  N

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5. Abstract

The history of star-formation has now been documented back to z ~ 5. While this is a
remarkable accomplishment, much remains to be done. The data used to measure SFR(z)
have been inhomogeneous at different redshifts. Measurements are exceptionally
difficult from z ~ 1 to 2, at or near the peak in SFR(z). Moreover, while the
overall form of SFR(z) can be explained within the context of the standard picture
of the hierarchical assembly of galaxies, there are still very few strong
observational constraints on either the physical causes of SFR(z) or its
implications for galaxy building. In this proposal we describe how extensive HST
archival ACS images in the Chandra Deep Field South can address these deficiencies.
We propose to analyse rest-frame near-UV and visible ACS images of ten thousand UV-
selected galaxies at z ~ 0 to 2 provided by NASA's GALEX mission. The GALEX data
will determine the galaxy redshifts and estimate the SFR's from UV luminosity and UV
color (using the same techniques that have been successful at higher-z). The HST
images will determine the size, morphology, photometric structure, and local
environments of these galaxies. The combination of HST+GALEX+ancillary-multiwaveband
data can test models for merger and interaction-induced star-formation and galaxy-
building and relate these processes to the origin of the Hubble sequence.
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                                                9929(  1) - 04/04/03 10:21  - [  2]

            Summary Form for Proposal  9929

  Item                         Used in this proposal
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  Proposal Category            AR
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