Power spectra from spotted accretion discs

Details Power spectra from spotted accretion discs Power spectra from spotted accretion discs

Apr 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..425p&link_type=abstract

Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #

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Scientific paper

In this paper we discuss the relativistic effects of the change of photon energy, light-bending and time-delays acting on X-ray signal from black hole accretion discs. We examine power spectra of variability predicted for a source, assuming a model of a `spotted' accretion disc around a non-rotating black hole. Relativistic effects are described in terms of transfer functions. For the life-time and the intrinsic emissivity of individual spots we adopt description in terms of a simple stochastic process. We give approximate formulae and compare them with numerical computations.

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