Models of the iron Kα fluorescent line and the Compton Shoulder in irradiated accretion disc spectra |
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| Authors: | A Ró&#;a&#;ska J Madej |
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| Institution: | Copernicus Astronomical Centre, Bartycka 18, 00-716 Warsaw, Poland;Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland |
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| Abstract: | We present a full set of model atmosphere equations for the accretion disc around a supermassive black hole irradiated by a 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 disc surface. Theoretical outgoing intensity spectra show soft X-ray excess below 1 keV, and distinct Kα and Kβ 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 Kα lines in active galactic nuclei. Our models exhibit the effect of limb-brightening in reflected X-rays. |
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| Keywords: | accretion accretion discs line: profiles radiative transfer scattering galaxies: active |
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