On the '3 kiloparsec arm' - Resonance excitation of linear and nonlinear waves by an oval distortion in the central region

Details On the '3 kiloparsec arm' - Resonance excitation of linear and nonlinear waves by an oval distortion in the central region On the '3 kiloparsec arm' - Resonance excitation of linear and nonlinear waves by an oval distortion in the central region

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...281..600y&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 281, June 15, 1984, p. 600-613. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

35

Galactic Evolution, Galactic Structure, Gas Dynamics, Intergalactic Media, Milky Way Galaxy, Spiral Galaxies, Wave Excitation, Angular Momentum, Differential Equations, Nonlinear Equations, Oort Cloud

Scientific paper

The mechanism responsible for the massive rapidly expanding Galactic feature known as the 3-kpc arm (Rougoor and Oort, 1960) is investigated theoretically in the framework of a density-wave model of the Galaxy. The arm is attributed to outgoing waves excited at the outer Lindblad resonance (OLR) of a small rotating oval distortion near the Galactic center. Linear and nonlinear models are developed, and it is shown that a density crest at 3.5 kpc with expansion velocity 53 km/s can be generated by a distortion turning at 118 km/s kpc with a 10-percent perturbation of the main gravitational field at the OLR (located at 3 kpc). The wave character of the nonlinear solution is found to be the same as that of the linear solution and to give good agreement with the observations in terms of expansion velocity, size, shape, and mass; only the observed asymmetry of the arm is not reproduced.

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