9079(  1) - 12/20/00 23:02  - [  1]

    PROPOSAL FOR HUBBLE SPACE TELESCOPE OBSERVATIONS   ST ScI Use Only
                                                       ID:      9079
                                                       Version: 1
                                                       Check-in Date: 20-Dec-2000
                                                                      22:52:21

1.Proposal Title:
AGN outflows: Ionization Equilibrium and Abundances in Seyfert UV absorbers
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2. Proposal For  3. Cycle
AR               10
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4. Investigators
                                                                                     Contact?
    PI: Nahum Arav                        UC Davis
   CoI: Prof. Kirk Korista                Western Michigan University                   N
   CoI: Dr. Martijn de Kool               Australian National University                N
   CoI: Dr. Michael Brotherton            NOAO                                          N
   CoI: Dr. Sally Laurent-Muehleisen      UC Davis                                      N
   CoI: Prof. Robert Becker               UC Davis                                      N

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5. Abstract

We propose to reanalyze the intrinsic absorption data from nearby Seyfert 1
galaxies, which are indicative of outflows emanating from the AGN. The main goal is
to improve our understanding of the ionization equilibrium and abundances (IEA) in
these outflows. To do so we will use analysis methods we developed in studying high-
z quasar outflows. The quality of the HST high resolution spectroscopic data for
Seyferts is very similar (both in S/N and resolution) to the Keck HIRES quasars'
data we analyzed in our studies. Furthermore, our quasar outflows have similar
widths and are detected in the same lines. We will concentrate on two main projects:
a) Extracting more accurate column densities from the detected absorption lines.
This step is a prerequisite for any attempt to determine the IEA in the flows.
Currently the column densities are uncertain by a factor of a few due to
insufficient treatment of partial covering factor effects. b) Extensive
photoionization modeling. In addition to relying on better column density
determination, we will improve upon the existing photoionization analysis by
incorporating inferences from FUSE and X-ray data of these objects, using
information from lower resolution HST data as well as upper limits for undetected
ions in the high-resolution data and taking into account attenuation of the incident
ionizing flux by flow components closer to the source.
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                                                9079(  1) - 12/20/00 23:02  - [  2]

            Summary Form for Proposal  9079

  Item                         Used in this proposal
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  Proposal Category            AR
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