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X-ray variability of active galactic nuclei and the flare model

Abstract : Short-term variability of X-ray spectra has been reported for several Active Galactic Nuclei. Significant X-ray flux variations are observed within time scales down to 104 105 s. We discuss short variability time scales in the framework of the X-ray flare model, which assumes the release of a large hard X-ray flux above a small portion of the accretion disk. The resulting observed X-ray spectrum is composed of the primary radiation as well as a reprocessed/Compton reflection component that we model performing numerical radiative transfer simulations. We conduct Monte-Carlo simulations of large flare distributions across the disk including relativistic corrections of the observed radiation and discuss general implications on AGN spectra and their variability.
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http://hal.in2p3.fr/in2p3-00185923
Contributor : Simone Lantz <>
Submitted on : Wednesday, November 7, 2007 - 3:25:28 PM
Last modification on : Wednesday, October 21, 2020 - 4:32:15 PM

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R. W. Goosmann, B. Czerny, A.-M. Dumont, M. Mouchet, A. Rózanska, et al.. X-ray variability of active galactic nuclei and the flare model. AGN variability from the X-rays to the radio, Jun 2004, Nauchy, Crimé, Ukraine. pp.1398-1402, ⟨10.1016/J.ASR.2005.04.028⟩. ⟨in2p3-00185923⟩

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