Reflection at large distance from the central engine in Seyferts

Details Reflection at large distance from the central engine in Seyferts Reflection at large distance from the central engine in Seyferts

2001-09-20

arxiv.org/abs/astro-ph/0109339v1

Mon.Not.Roy.Astron.Soc. 336 (2002) 1209

Astronomy and Astrophysics

Astrophysics

Proceeding of the meeting "X-ray emission from accretion onto black hole" 20-23 June 2001, Hopkins University, Baltimore, USA

Scientific paper

10.1046/j.1365-8711.2002.05851.x

We consider the possibility that most of the reflection component, observed in the hard X-ray spectra of Seyfert galaxies, could be formed on an extended medium, at large distance from the central source of primary radiation (e.g. on a torus). Then, the reflector cannot respond to the rapid fluctuations of the primary source. The observed reflected flux is controlled by the time-averaged primary spectrum rather than the instantaneous (observed) one. We show that this effect strongly influence the spectral fits parameters derived under the assumption of a reflection component consistent with the primary radiation. We find that a pivoting primary power-law spectrum with a nearly constant Comptonised luminosity may account for the reported correlation between the reflection amplitude $R$ and the spectral index $\Gamma$.

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