On the generation of 1/f fluctuations in X-rays from black-hole objects

Details On the generation of 1/f fluctuations in X-rays from black-hole objects On the generation of 1/f fluctuations in X-rays from black-hole objects

Feb 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994pasj...46...97m&link_type=abstract

PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 46, no. 1, p. 97-105

Astronomy and Astrophysics

Astronomy

78

Accretion Disks, Active Galactic Nuclei, Astronomical Models, Black Holes (Astronomy), Magnetic Field Reconnection, Variations, X Ray Astronomy, X Rays, Density (Mass/Volume), Flares, Luminosity

Scientific paper

There exist fluctuations with a frequency dependence of f-beta with beta approx. 1 in the X-rays from stellar black-hole candidates and active galactic nuclei. We present here a simple cellular automation model for generating such fluctuations. In this model, a gas particle is randomly injected into an accretion disk surrounding a black hole. When the mass density of the disk exceeds some critical value at a certain point, an unknown instability is assumed to become established and accumulated material begins to drift inward as an avalanche, thereby emitting X-rays. The system then evolves to and stays in a self-organized critical state, in which the mass density is barely below the critical value everywhere, regardless of the initial conditions. With this model, we have succeeded in generating 1/f-like fluctuations in the X-ray luminosity in spite of random mass injection. Possible origins for the assumed instability are briefly discussed. We conclude that the reconnection of disk magnetic fields, resulting in flares similar to solar flares, is the most promising candidate.

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