Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993ap%26ss.210..365h&link_type=abstract
Astrophysics and Space Science (ISSN 0004-640X), vol. 210, no. 1-2, p. 365-367
Astronomy and Astrophysics
Astronomy
2
Accretion Disks, Active Galactic Nuclei, Black Holes (Astronomy), Computerized Simulation, Magnetohydrodynamic Stability, Stellar Oscillations, Perturbation Theory, Seyfert Galaxies, Thermal Stability, Viscosity
Scientific paper
The innermost region of slim accretion disks with standard alpha viscosity is unstable against axisymmetric radial inertial acoustic perturbations under certain conditions. Numerical simulations are performed in order to demonstrate behaviors of such unstable disks. It is shown that oscillations with the period of about 10-3(MBH/solar mass)s can be excited near the innner edge of the disks, where MBH is the mass of the central object. This kind of unstable disks is a possible origin of the periodic X-ray time variabilities with period of about 104s observed in a Seyfert galaxy NGC 6814.
Honma Fumio
Kato Shoji
Matsumoto Ryo
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