10651(  1) - 04/05/05 12:18  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      10651
                                                       Version: 1
                                                       Check-in Date: 05-Apr-2005
                                                                      16:18:12

1.Proposal Title:
The Stellar Mass Function of Disks and Bulges at z = 1
------------------------------------------------------------------------------------
2. Proposal For  3. Cycle  4. Parallel Pointing Tolerance
AR               14        <none>
------------------------------------------------------------------------------------
5. Investigators
                                                                                     Contact?
    PI: Dr. Sandra M. Faber               University of California - Santa Cruz
   CoI: Mr. Kevin Bundy                   California Institute of Technology            N
   CoI: Dr. Christopher Conselice         California Institute of Technology            N
   CoI: Dr. Jiasheng Huang                Smithsonian Institution Astrophysical         N
                                          Observatory
   CoI: Dr. Susan A. Kassin               University of California - Santa Cruz         N
   CoI: Dr. Leonidas Moustakas            Space Telescope Science Institute             N
   CoI: Dr. Luc Simard                    Dominion Astrophysical Observatory            N
   CoI: Dr. Rachel S. Somerville          Space Telescope Science Institute             N

------------------------------------------------------------------------------------
6. Abstract

The disks of galaxies are thought to form quiescently, while bulges form in mergers.
Measuring the amount of mass in bulges and disks separately therefore determines the
relative importance of these two formation channels versus time. This proposal would
exploit a unique multiwavelength database to measure the total stellar mass
functions of red and blue galaxies down to 1 billion solar masses at z = 1, and
obtain the first measurement of the mass functions of bulges and disks SEPARATELY at
that redshift. The cornerstone of the project is a set of parallel NIC3 images in
the Extended Groth Strip, which is unique among Hubble near-IR imaging surveys and
is much more sensitive to old stellar components than ACS V or I. NIC3 photometry
will be used to improve and deepen IRAC photometry and to measure accurate photo-z's
for faint galaxies far below the spectroscopy limit. ACS and NIC3 images together
will be used to construct SEDs separately for bulge and disk components to determine
bulge-to-disk mass ratios of individual galaxies and, from them, mass functions. The
data will go deep enough to reveal any faint population of red galaxies at z = 1,
and will provide the first measurement of disk-radius evolution based on underlying
old stars. High Level Data Products will be created to distribute all catalogs to
the public.
------------------------------------------------------------------------------------
                                                10651(  1) - 04/05/05 12:18  - [  2]

            Summary Form for Proposal  10651

  Item                         Used in this proposal
------------------------------------------------------------------------------------------------------------------------------------
  Proposal Category            AR
------------------------------------------------------------------------------------------------------------------------------------