A comment on the paper by Mineshige et al. on the cellular automaton model for the variability of accretion disks around black holes

Details A comment on the paper by Mineshige et al. on the cellular automaton model for the variability of accretion disks around black holes A comment on the paper by Mineshige et al. on the cellular automaton model for the variability of accretion disks around black holes

Oct 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46..523a&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 5, p. 523-525

Astronomy and Astrophysics

Astronomy

11

Accretion Disks, Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Power Spectra, Variability, X Ray Astronomy, X Ray Spectra, Axes Of Rotation, Doppler Effect, Gravitational Lenses, Inclination, Rotating Disks

Scientific paper

Stellar black-hole candidates and active galactic nuclei are believed to contain accretion disks around black holes. Their X-ray variability is characterized by power spectra with a power law dependence on the variability frequency. The power slope beta is in the range between 1 and 2 and its most typical value is around 1.5. Mineshige et al. (1994) have recently simulated this type of accretion disk fluctuations by a cellular automaton 'ant-lion' model and obtained beta = 1.8. We point out that their model describes intrinsic fluctuations of accretion disks and that the observed value beta = 1.8 is to be expected for disks oriented pole-on with respect to the detector. For disks with a non-zero inclination, the observed power spectrum slope should be flatter. We have calculated variability power spectra for accretion disk fluctuations described by the Mineshige et al. model, and obtained beta = 1.7, 1.6, and 1.4 for disks with inclinations i = 20 deg, 60 deg, and 80 deg respectively, in an excellent agreement with observations.

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