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| Paper: |
Photoionization Modeling with TITAN Code, Distance to the Warm Absorber
in AGN |
| Volume: |
460, AGN Winds in Charleston |
| Page: |
218 |
| Authors: |
Różańska, A. |
| Abstract: |
We present a method that allows us to estimate a distance from the
source of continuum radiation located in the center of AGN to the
highly ionized gas - warm absorber (WA). We computed a set of
constant total pressure photoionization models compatible with the
warm absorber conditions, where a metal-rich gas is irradiated by a
continuum in the form of a double powerlaw. The first powerlaw is hard,
up to 100 keV, and represents radiation from an X-ray source, while
the second powerlaw extends up to several eV, and illustrates
radiation from an accretion disk. When the ionized continuum is
dominated by the soft component, the warm absorber is heated by
free-free absorption, instead of Comptonization, and the transmitted
spectra show different absorption-line characteristics for different
values of the hydrogen number density at the cloud illuminated
surface. This fact results in the possibility of deriving the number
density on the cloud illuminated side from observations, and hence the
distance to the warm absorber. |
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