10664(  1) - 04/05/05 12:25  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      10664
                                                       Version: 1
                                                       Check-in Date: 05-Apr-2005
                                                                      16:25:24

1.Proposal Title:
Linking Galaxies and their Dark Matter Haloes with Gravitational Lensing
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2. Proposal For  3. Cycle  4. Parallel Pointing Tolerance
AR               14        <none>
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5. Investigators
                                                                                     Contact?
    PI: Dr. Michael J. Hudson             University of Waterloo
   CoI: Ms. Laura C. Parker               University of Waterloo                        N
   CoI: Dr. David C. Koo                  University of California - Santa Cruz         N

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6. Abstract

We propose to use existing ACS images to derive, for the first time, solid
measurements of the ratio of dynamical and halo masses for a sample of distant, and
thus younger, galaxies using the technique of galaxy-galaxy lensing. The 2 filter
HST images are critical in providing both the weak lensing signals to derive the
halo masses, and the set of information (inclination, size, position angle, and
emission line distribution) needed to convert spatially resolved Keck spectra into
dynamical masses. Besides dynamical masses, the multiband ACS images are essential
for extracting morphological, photometric, and structural information for the
distant galaxies. We plan to use 3 ACS surveys with 2 or more filters (GOODS-N,
GOODS-S, and the Extended Groth Strip) for this analysis. The wide areal coverage of
these fields (900 sqarcmin) will allow us to improve on previous lensing results in
the Hubble Deep Field by a factor of 20 in signal-to-noise ratio. With over 4500
kinematic measurements and 1000 rotation curves to be studied via galaxy-galaxy
lensing, the sample enables powerful new tests of the relationship of halo masses of
younger galaxies to not only dynamical masses, but also to subsets divided by
redshift, luminosity, morphology, B/T, color, etc. The direct measurements of the
connections between dark matter halos and their baryonic galaxies provide
fundamental knowledge and checks of the reigning LCDM models for galaxy formation.
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                                                10664(  1) - 04/05/05 12:25  - [  2]

            Summary Form for Proposal  10664

  Item                         Used in this proposal
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  Proposal Category            AR
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