Resonance excitation of spiral density waves in a gaseous disk. II - A nonlinear theory and application to the 3 kiloparsec arm

Journal Article · Mon Jul 01 00:00:00 EDT 1991 · Astrophysical Journal; (United States)

DOI:https://doi.org/10.1086/170259· OSTI ID:5224111

Yuan, Chi; Cheng, Ye ^[1]

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1. City College, New York (United States) National Tsing Hua University, Hsinchu (Republic of China) STX Corp., New York (United States)

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. 17 refs.

• OSTI ID: 5224111
• Journal Information: Astrophysical Journal; (United States), Vol. 376; ISSN 0004-637X
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
GALAXIES
MORPHOLOGY
DIFFERENTIAL EQUATIONS
DISTURBANCES
INTEGRAL EQUATIONS
MASS
MILKY WAY
NONLINEAR PROBLEMS
RADIAL VELOCITY
SPIRAL CONFIGURATION
WAVE PROPAGATION
CONFIGURATION
EQUATIONS
VELOCITY
640105* - Astrophysics & Cosmology- Galaxies