Computer Science
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9079a&link_type=abstract
HST Proposal ID #9079
Computer Science
Hst Proposal Id #9079 Agn/Quasars
Scientific paper
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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