Modeling an accretion disc stochastical variability

Details Modeling an accretion disc stochastical variability Modeling an accretion disc stochastical variability

2007-11-29

arxiv.org/abs/0711.4772v1

Astronomy and Astrophysics

Astrophysics

Proceedings of the Workshop on the Black Holes and Neutron Stars, eds. S. Hledik and Z. Stuchlik, 19-21 September 2007 (Silesi

Scientific paper

Hot spots residing on the surface of an accretion disc have been considered as a model of short-term variability of active galactic nuclei. In this paper we apply the theory of random point processes to model the observed signal from an ensemble of randomly generated spots. The influence of general relativistic effects near a black hole is taken into account and it is shown that typical features of power spectral density can be reproduced. Connection among spots is also discussed in terms of Hawkes' process, which produces more power at low frequencies. We derive a semi-analytical way to approximate the resulting power-spectral density.

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