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The impact of accretion disk winds on the X-ray spectrum of AGN: Part 1
- XSCORT | | N. J. Schurch
; C. Done
; | | Date: |
13 Jun 2007 | | Abstract: | (abridged) The accretion disk in AGN is expected to produce strong outflows,
in particular a UV-line driven wind. Despite providing a good fit to the data,
current spectral models of the X-ray spectrum of AGN observed through an
accretion disk wind are ad-hoc in their treatment of the properties of the wind
material. In order to address these limitations we adopt a numerical
computation method that links a series of radiative transfer calculations,
incorporating the effect of a global velocity field in a self-consistent manner
(XSCORT). We present a series of example spectra from the XSCORT code that
allow us to examine the shape of AGN X-ray spectra seen through a wind, for a
range of velocity and density distributions, total column densities and initial
ionization parameters. These detailed spectral models clearly show considerable
complexity and structure that is strongly affected by all these factors. The
presence of sharp features in the XSCORT spectra contrasts strongly with both
the previous models and with the smooth nature of the observed X-ray spectra of
AGN with soft X-ray excesses, demonstrating that accretion disk winds are
unlikely to be the origin of this mysterious spectral feature. The most
significant parameter affecting the presence of the sharp features in the
models is the terminal velocity of the wind. Increasing the terminal velocity
of the absorbing material to ~c, and hence dramatically increasing the velocity
dispersion across the wind, could potentially remove these features resulting
in a spectrum similar to the previous models. Such a fast moving outflow cannot
be associated with a radiatively driven accretion disk wind, however the
presence of a highly relativistic jet may provide an origin for such material. | | Source: | arXiv, arxiv.0706.1885 | | Services: | Forum | Review | PDF | Favorites | |
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