Premium
Power spectra from ‘spotted’ accretion discs
Author(s) -
Pecháček T.,
Dovčiak M.,
Karas V.
Publication year - 2006
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/asna.200610671
Subject(s) - physics , accretion (finance) , emissivity , spectral line , astrophysics , accretion disc , computation , observer (physics) , spectral density , computational physics , astronomy , optics , quantum mechanics , algorithm , computer science , telecommunications
We are carrying out a project to calculate power spectra of variability, assuming a model of a ‘spotted’ accretion disc near a black hole. We consider relativistic effects that change photon energy and produce light‐bending and time‐delays acting on the X‐ray signal received by an observer. We assume that the life‐time and the intrinsic emissivity of individual.aring events are described in terms of a simple stochastic process. This allows us to give approximate analytical formulae and compare them with numerical computations. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)