Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-02-17
Astron.Astrophys. 420 (2004) 1-16
Astronomy and Astrophysics
Astrophysics
Astronomy and Astrophysics (in press)
Scientific paper
10.1051/0004-6361:20035741
We discuss a model of X-ray variability of active galactic nuclei (AGN). We consider multiple spots which originate on the surface of an accretion disk following intense irradiation by coronal flares. The spots move with the disk around the central black hole and eventually decay while new spots continuously emerge. We construct time sequences of the spectra of the spotted disk and compute the corresponding energy-dependent fractional variability amplitude. We explore the dependence on the disk inclination and other model parameters. AGN seen at higher inclination with respect to the observer, such as Seyfert 2 galaxies, are expected to have fractional variability amplitude of the direct emission by a factor of a few higher than objects seen face on, such as the Seyfert 1s.
Czerny Bozena
Dovciak Michael
Dumont Anne-Marie
Karas Vladimir
Rozanska Agata
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