Slim accretion discs with different viscosity prescriptions

Details Slim accretion discs with different viscosity prescriptions Slim accretion discs with different viscosity prescriptions

May 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..377s&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, May 15, 1990, p. 377-383.

Statistics

Computation

34

Accretion Disks, Computational Astrophysics, Viscosity, X Ray Sources, Astronomical Models, Thermal Stability

Scientific paper

The variability of X-ray sources powered by accretion may be connected to thermal instabilities in the innermost parts of slim disks. The time-scales of variability predicted by the theory with the standard alpha-viscosity prescription agree with those observed in a wide range of sources. The amplitudes (3-4 orders of magnitude in luiminosity) are correctly predicted for X-ray transient sources, but in general are too big for quasars, Seyferts, galactic blackhole candidates and LMXBs. It is shown that a slight modification of the viscosity prescription can offer a much better agreement with observations.

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