9948(  1) - 04/04/03 10:32  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9948
                                                       Version: 1
                                                       Check-in Date: 04-Apr-2003
                                                                      10:31:53

1.Proposal Title:
AGN in the GOODS fields: A Study of Short-Term Variability, Spectroscopy and
Morphology
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2. Proposal For  3. Cycle
AR               11
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4. Investigators
                                                                                     Contact?
    PI: Vicki Sarajedini                  University of Florida
   CoI: Dr. David Koo                     University of California - Santa Cruz         N

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5. Abstract

We are proposing a 2-pronged approach to identify and study AGN in the GOODS fields
(PID 9425 and 9583). First, we will identify variable nuclei in the centers of
galaxies in both GOODS North and South fields by analyzing the 5 epochs of ACS
images obtained at 45-day intervals. A large fraction (60%) of Seyfert-luminosity
AGN are expected to vary on month-to- month timescales, which we expect to detect at
less than 0.1 magnitude fluctuations in the ACS images. The high resolution
capabilities of HST are critical to isolate and measure variability for nuclei too
faint to be detected from the ground. This would constitute the first measurement of
short- term variability for faint AGN extending to z~1 and will allow us to study
evolutionary trends in variability properties for AGN. The second component of our
research is focused on the spectroscopically identified AGN in the GOODS-N field. A
Keck Treasury Spectral Survey is being conducted in the GOODS-N field using the
DEIMOS spectrograph. Broad and narrow-line AGN will be selected from the ~2000
galaxies expected to yield redshifts in this field. The high resolution ACS images
will be used to separate the AGN from the host galaxy light and study the
morphology, size and environment of the host galaxy. Together these studies will
address questions concerning the nature of low-luminosity AGN evolution and short-
term variability at z~1.
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                                                9948(  1) - 04/04/03 10:32  - [  2]

            Summary Form for Proposal  9948

  Item                         Used in this proposal
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  Proposal Category            AR
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