Statistics – Computation
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasj...44..509h&link_type=abstract
PASJ: Publications of the Astronomical Society of Japan (ISSN 0004-6264), vol. 44, no. 5, p. 509-519.
Statistics
Computation
17
Galactic Structure, Interstellar Gas, Interstellar Magnetic Fields, Jeans Theory, Magnetohydrodynamic Stability, Astronomical Models, Computational Astrophysics, Rotating Plasmas
Scientific paper
The fragmentation of the Galactic gaseous disk was investigated by means of a linear stability analysis. We approximated the equilibrium Galactic disk to be a uniformly rotating gaseous sheet in which the magnetic field runs in a horizontal direction. The gravitational acceleration during equilibrium was set to be equal to Oort's value. The perturbation equation was solved numerically while taking account of the self-gravity of the gas, the interstellar magnetic field, and the rotation. The Parker and Jeans instabilities take place almost independently, although they slightly interfere with each other. At a gas density of n(c) about 1/cu cm, the Jeans instability proceeds at the rate of the angular momentum extraction from a fragment due to the magnetic torque. The growth rate of not only the Parker instability, but also the Jeans instability, is thus proportional to the magnetic field strength.
Hanawa Tomoyuki
Nakamura Fumitaka
Nakano Takenori
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