Other
Scientific paper
Jun 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980acasn..21..189s&link_type=abstract
Acta Astronomica Sinica, vol. 21, June 1980, p. 189-195. In Chinese, with abstract in English.
Other
Disk Galaxies, Galactic Structure, Interstellar Gas, Spiral Galaxies, Stellar Structure, Differential Equations, Galactic Rotation, Gas Density, Two Fluid Models, Velocity Distribution
Scientific paper
This paper discusses the role played by the interstellar gas in spiral galaxies. To represent a disk-shaped galaxy, a two-gas-disk model (one for the interstellar gas disk and the other for the stellar disk) is adopted. The following conclusions are drawn from the analysis: (1) with the different velocity dispersion between gas and stars, the stellar arm must be divorced from the gas arm; (2) such divorce makes the spiral mode of density waves in a disk-shaped galaxy unstable; (3) the ratio between the densities of gas and stars in galaxies should be less than a certain value to maintain the density waves for a long time; and (4) the less the ratio is, the more tightly the spiral arm winds up.
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