Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276..127j&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 276, Jan. 1, 1984, p. 127-134.
Astronomy and Astrophysics
Astrophysics
86
Disk Galaxies, Gravitational Collapse, Interstellar Gas, Milky Way Galaxy, Molecular Clouds, Two Fluid Models, Galactic Structure, Gas Density, Radial Velocity, Spiral Galaxies, Stellar Motions, Systems Stability
Scientific paper
The consequences of treating a galactic disk as a two-fluid system for the stability of the entire disk and form of the gas in the disk are examined. It is found that the existence of even a small fraction of the total disk surface density in a cold fluid makes it much harder to stabilize the entire two-fluid disk. At the higher effective gas densities resulting from the growth of a two-fluid instability, the gas may become unstable even when it is itself originally stable. The wavelength of a typical gas instability in the inner galaxy is about 400 pc, and it contains about 10 million solar masses of interstellar matter; these instabilities may be identified with clusters of giant molecular clouds. It is suggested that many of the spiral features seen in gas-rich spiral galaxies may be material arms or arm segments resulting from sheared two-fluid gravitational instabilities.
Jog Chanda J.
Solomon Philip M.
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