Instabilities in self-gravitating gaseous discs

Details Instabilities in self-gravitating gaseous discs Instabilities in self-gravitating gaseous discs

Feb 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991mnras.248..353p&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 248, Feb. 1, 1991, p. 353-369. Research supported by NA

Statistics

Computation

67

Accretion Disks, Cosmic Gases, Gravitational Effects, Rotating Fluids, Vorticity, Angular Momentum, Computational Astrophysics, Eigenvalues, Equations Of Motion, Planetary Rings

Scientific paper

The nonlinear evolution of thin self-gravitating gaseous disks with unstable nonaxisymmetric normal modes is estimated. The instabilities occur when the initially axisymmetric disk is stable to axisymmetric modes. The modes can have corotation situated either inside or just outside the disk's outer boundary. The unstable modes are found to be important for redistributing the disk's mass and angular momentum on a dynamical time-scale appropriate to the outer disk. Unstable nonaxisymmetric modes may be crucial in driving mass accretion on to central galactic black holes or protostars embedded by self-gravitating gaseous disks.

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