Models of the iron K_alpha fluorescence line and the Compton shoulder in irradiated accretion disk spectra

Details Models of the iron K_alpha fluorescence line and the Compton shoulder in irradiated accretion disk spectra Models of the iron K_alpha fluorescence line and the Compton shoulder in irradiated accretion disk spectra

2008-04-08

arxiv.org/abs/0804.1232v1

Astronomy and Astrophysics

Astrophysics

10 pages, 8 Postscript figures, accepted to MNRAS

Scientific paper

We present a full set of model atmosphere equations for the accretion disk around a supermassive black hole irradiated by hard X-ray lamp of power-law spectral distribution. Model equations allow for multiple Compton scattering of radiation on free electrons, and for large relative photon-electron energy exchange at the time of scattering. We present spectra in specific intensities integrated over the disk surface. Theoretical outgoing intensity spectra show soft X-ray excess below 1 keV, and distinct K_alpha and K_beta fluorescent lines of iron. We demonstrate the existence of the Compton Shoulder and claim that it can contribute to the asymmetry and equivalent widths of some observed Fe K_alpha lines in AGN. Our models exhibit the effect of limb-brightening in reflected X-rays.

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