Astronomy Letters

, Volume 43, Issue 10, pp 677–689 | Cite as

Modeling of high-frequency variability in X-ray binaries with black holes

  • A. N. Semena
  • M. G. Revnivtsev
  • T. I. Larchenkova
  • A. A. Lutovinov


The properties of the aperiodic variability in X-ray binaries with black holes are considered. The power spectra of the luminosity variability for a flat accretion disk that is an emission source with a powerlaw energy spectrum have been modeled. At low frequencies the derived power spectrum has the form of a power law with a slope ϱ ≈ −1 and a cutoff at a frequency corresponding to the characteristic frequency of fluctuations at the inner disk edge; at higher frequencies the power spectrum has a complex form. The high-frequency variability is suppressed due to the arrival time delays of photons emerged in different parts of the disk. The presence of azimuthal accretion rate fluctuations in the disk and the disk surface brightness nonuniformity in the observer’s imaginary plane caused by the relativistic effects give rise to an additional variability component at frequencies ∼ 200 Hz.


accretion X-ray binaries aperiodic variability 


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Copyright information

© Pleiades Publishing, Inc. 2017

Authors and Affiliations

  • A. N. Semena
    • 1
  • M. G. Revnivtsev
    • 1
  • T. I. Larchenkova
    • 2
  • A. A. Lutovinov
    • 1
  1. 1.Space Research InstituteMoscowRussia
  2. 2.Astrospace Center, P.N. Lebedev Physical InstituteRussian Academy of SciencesMoscowRussia

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