Supercloud formation by nonaxisymmetric gravitational instabilities in sheared magnetic galaxy disks

Details Supercloud formation by nonaxisymmetric gravitational instabilities in sheared magnetic galaxy disks Supercloud formation by nonaxisymmetric gravitational instabilities in sheared magnetic galaxy disks

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312..626e&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. 626-639.

Statistics

Computation

102

Computational Astrophysics, Galactic Evolution, Gas Dynamics, Magnetohydrodynamic Stability, Molecular Clouds, Axisymmetric Flow, Gas Density, Gravitational Collapse, Star Formation, Two Dimensional Flow

Scientific paper

The gravitational stability of sheared perturbations in magnetic gas disks is investigated. Realistic shapes and amplitudes for the initial perturbations are considered. The magnetic field destabilizes the gas for all densities. The collapse is primarily along the mean field direction, and for a pressure-equilibrium field strength, the growth rate is similar to that for the nonrotating, nonmagnetic Jeans instability. The ambient interstellar medium in normal disk galaxies should spontaneously form low-density, 107M_sun; cloud complexes on time scales of 108yr.

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