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We present a full set of model atmosphere equations for the accretion diskaround a supermassive black hole irradiated by hard X-ray lamp of power-lawspectral distribution. Model equations allow for multiple Compton scattering ofradiation on free electrons, and for large relative photon-electron energyexchange at the time of scattering. We present spectra in specific intensitiesintegrated over the disk surface. Theoretical outgoing intensity spectra showsoft X-ray excess below 1 keV, and distinct K_alpha and K_beta fluorescentlines of iron. We demonstrate the existence of the Compton Shoulder and claimthat it can contribute to the asymmetry and equivalent widths of some observedFe K_alpha lines in AGN. Our models exhibit the effect of limb-brightening inreflected X-rays.

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