Multiwavelength Campaign on Mrk 509 IX: Limits on the Distance of the Absorber from HST COS and STIS Spectroscopy

Details Multiwavelength Campaign on Mrk 509 IX: Limits on the Distance of the Absorber from HST COS and STIS Spectroscopy Multiwavelength Campaign on Mrk 509 IX: Limits on the Distance of the Absorber from HST COS and STIS Spectroscopy

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21943404e&link_type=abstract

American Astronomical Society, AAS Meeting #219, #434.04

Astronomy and Astrophysics

Astronomy

Scientific paper

Active Galactic Nuclei often show strong photoionized outflows. A major uncertainty in models for these outflows is the distance to the gas from the central black hole. In this paper we use HST/COS data from a massive multiwavelength monitoring campaign on the Seyfert I galaxy Mrk 509 in combination with archival HST/STIS data to constrain the location of the outflow. We contrast the expected response of the photoionized gas to changes in ionizing flux with the changes measured in the data using the following steps: 1) Comparing the column densities of each kinematic component measured in the 2001 STIS data to those measured in the 2009 COS data; 2) Using time-dependent photionization calculations along with Monte Carlo simulations of lightcurves to determine the upper limit to the hydrogen number density that will be consistent with the small observed changes in the ionic column densities; 3) Transforming the upper limit on the hydrogen number density to a lower limit on the distance to the absorber from the central source via the prior determination of the ionization parameter. The very small variations in ionic column densities (mostly consistent with no change) between the 2001 and 2009 epochs allow us to put a lower limit on distances between 100-200 pc for all the major UV absorption components. These results are in good agreement with the independent distance estimates derived for the simultaneous X-ray absorber data.

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