Physics – Plasma Physics
Scientific paper
Dec 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976scisn..19..767f&link_type=abstract
Scientia Sinica, vol. 19, Nov.-Dec. 1976, p. 767-778.
Physics
Plasma Physics
Density Wave Model, Galactic Structure, Gas Heating, Interstellar Gas, Spiral Galaxies, Star Formation, Astronomical Models, Cosmology, Galactic Evolution, Maintenance, Wave Amplification, Wave Dispersion, Wave Excitation, Wentzel-Kramer-Brillouin Method
Scientific paper
It was shown that the process of star formation and consequent heating of interstellar gas makes the spiral mode of density wave in a disk-shaped galaxy unstable. Yet paradoxically, it is this instability itself that provides a mechanism for the excitation of galactic density waves and the maintenance of spiral structure. A gasdynamic model proposed by Lin and Lau (1975) was adopted, but the polytropic gas equation was replaced by the energy equation with sources and sinks. Using the WKBJ approximation, the dispersion relation was obtained for both a single-gas and a two-gas disk model (one for the interstellar gas disk and the other for the stellar disk). The results of the two cases turned out to be virtually identical. Using a well-known method of nonuniform plasma physics, the quantum condition was derived in the form of a definite integral which, under small imaginary part approximation, allows the determination of pattern frequency and amplification rate for the global solution.
Fang L.-Z.
Liu Zheng-You
Weng S.-T.
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