Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...376..104y&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 376, July 20, 1991, p. 104-114. Sponsorship: National Science Council of th
Astronomy and Astrophysics
Astrophysics
17
Density Distribution, Disk Galaxies, Galactic Structure, Milky Way Galaxy, Wave Excitation, Wave Generation, Differential Equations, Integral Equations, Nonlinearity, Wave Propagation
Scientific paper
The present nonlinear theory of spiral density waves in a thin, viscous, self-gravitating gaseous disk views the waves as generated near the Lindblad resonance by periodic disturbances through an excitation mechanism. The suggestion of Yuan (1984), that either a minor oval distortion or an uneven distribution of mass in the center can excite a spiral density wave whose radial velocity and mass concentration are in excellent agreement with observations of the 3 kpc arm of the Galaxy, is confirmed. Reliable results are obtained for nonlinear density waves either in a gaseous disk or in the gas components of a galactic disk.
Cheng Ye
Yuan Chi
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