Physics
Scientific paper
Jul 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002hst..prop.9536a&link_type=abstract
HST Proposal ID #9536
Physics
Hst Proposal Id #9536 Agn/Quasars
Scientific paper
Over the last few years we have shown that the traditional techniques for measuring absorption column densities: equivalent-width, curve of growth and Gaussian modeling, often yield misleading results when applied to AGN intrinsic absorbers associated with outflows. We propose to develop and refine alternative analysis tools that are based on deriving physical solutions for the optical depth and covering of the absorbing flows, and make them available as a software package to the community. Using these techniques, we will re-analyze all the high-resolution spectroscopic observations of Seyfert outflows found in the HST archive {currently 133 orbits}. The data products of this reanalysis will benefit researchers studying the relationship between the UV and X-ray warm absorbers, chemical abundances in the AGN environment and dynamical models of the outflows. We will expand our newly developed parameter-space approach to photoionization modeling to include the effects of: optically thick {bound-free} outflows, a wide range of incident ionizing spectra, and the effect of shielding on the flows. Once developed, we will make these models available to the community. To determine the physical properties of the outflows, we will apply these tools to the improved measurements from the UV data, as well as to the Chandra and FUSE absorption data from the same objects. We plan to achieve these goals over the course of a 3 years program.
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