The stability of self-gravitating magnetic accretion disks

Details The stability of self-gravitating magnetic accretion disks The stability of self-gravitating magnetic accretion disks

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999cha%26a..23...36l&link_type=abstract

Chinese Astronomy and Astrophysics, Volume 23, Issue 1, p. 36-41.

Astronomy and Astrophysics

Astrophysics

Scientific paper

The radial oscillation instability of both magnetic-equipartion and magnetic-conservation models of accretion disks with self-gravitation is examined. Our results show that there are three modes in the disk. The viscous mode is always stable, the magneto-acoustic mode is unstable, and the neutral mode tends to be stable in long wavelength region and unstable in short wavelength region. The effects of self-gravitation for the three modes are similar in both models, but the effects of the magnetic field are opposite. These results suggests that the magnetic-equipartition model is the best one for explaining the time variations of X-ray stars and active galactic nuclei.

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