The rotation of accretion disks and the power spectra of X-ray 'flickering'

Details The rotation of accretion disks and the power spectra of X-ray 'flickering' The rotation of accretion disks and the power spectra of X-ray 'flickering'

Jun 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...246...21z&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 246, no. 1, June 1991, p. 21-31.

Computer Science

Numerical Analysis

37

Accretion Disks, Active Galactic Nuclei, Power Spectra, Stellar Orbits, X Ray Binaries, Brightness Distribution, Light Curve, Numerical Analysis, Temporal Distribution

Scientific paper

The X-ray producing, inner region of the accretion disk in AGN is likely to be nonstationary and nonaxisymmetric. This nonstationarity and nonaxisymmetry in disk surface brightness may be modeled by considering the presence of many 'hot spots' on a steady axisymmetric disk. As long as a 'spot' can survive for a few orbital periods, its orbital frequency can be introduced into the light curve either by relativistic orbital motion or by eclipsing of the spot by the disk. These rotational effects vary with the local properties of the spot population. Depending on the radial variation of spot brightness, lifetime and number density, the observed variability power spectrum may differ from that due to the intrinsic variability of spots alone, within the orbital frequency range in which these spots alone, within the orbital frequency range in which these spots occur. The relation between properties assumed for the spot population and the resulting predictions for the observed variability are explored. The implications of the results for the 'flickering' of X-ray sources powered by accretion disks (both AGN and galactic sources) are also discussed.

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