9936(  1) - 04/04/03 10:24  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9936
                                                       Version: 1
                                                       Check-in Date: 04-Apr-2003
                                                                      10:23:48

1.Proposal Title:
Evolution of the Tully-Fisher Relation of High Redshift z > 1 Disks  Using  GOODS-N
Images and Keck DEIMOS Spectra
------------------------------------------------------------------------------------
2. Proposal For  3. Cycle
AR               11
------------------------------------------------------------------------------------
4. Investigators
                                                                                     Contact?
    PI: David Koo                         University of California - Santa Cruz
   CoI: Ms. Anne Metevier                 University of California - Santa Cruz         N
   CoI: Dr. Andrew Phillips               University of California - Santa Cruz         N

------------------------------------------------------------------------------------
5. Abstract

We propose to study the evolution in the slope, zero-point, and dispersion of the
Tully-Fisher relation for ~300 galaxies in the GOODS-N field. The maximum circular
velocities will be extracted from spatially resolved kinematics measured from high
quality Keck spectra that reach R(AB)=24 from the public release of the Keck
Treasury Survey of GOODS-N. The HST images are needed to model the galaxies' disk
components for measures of disk sizes, position angles, and inclinations. These are
essential inputs into our algorithms for deriving the maximum circular velocities
from the observed kinematics. The main improvements of this proposed project over
existing TF studies of distant galaxies will be: 1) having larger samples that will
allow reliable tracking of evolution and correlations of residuals with galaxy
properties; 2) having well-measured kinematics that reach to z ~ 1.4, when galaxies
were younger, evolution should be greater, and galaxies are inferred to be
undergoing major assembly and transformation; 3) having use of 4 HST filters that
enable uniform restframe luminosities and colors over a wider redshift range; and 4)
using deeper, higher resolution HST images that give vastly improved measures of
disk properties, including sizes, inclinations, light profiles, morphologies,
asymmetries, luminosities, and colors, etc. These HST measurements are not only
critical for the conversion of observed kinematics to dynamical mass, but also the
key ingredients to study the scaling relations of disks and their early evolution
that will place important constraints on theories for disk formation.
------------------------------------------------------------------------------------
                                                9936(  1) - 04/04/03 10:24  - [  2]

            Summary Form for Proposal  9936

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