Nonlinear interaction of spiral density waves in flat galaxies

Details Nonlinear interaction of spiral density waves in flat galaxies Nonlinear interaction of spiral density waves in flat galaxies

Jun 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980azh....57..505r&link_type=abstract

(Astronomicheskii Zhurnal, vol. 57, May-June 1980, p. 505-510.) Soviet Astronomy, vol. 24, May-June 1980, p. 291-294. Translati

Astronomy and Astrophysics

Astronomy

1

Density Wave Model, Disk Galaxies, Galactic Evolution, Spiral Galaxies, Nonlinear Systems, Wave Interaction

Scientific paper

Equations describing the nonlinear interaction of spiral density waves in flat galaxies are obtained by the method of averaged Lagrangians. Galaxies are modeled by an infinitely thin gas disk. The instability of a moderate-amplitude density wave against nonlinear breakup into several trigger spiral waves is considered; the conditions whereby such instability can set in are established and its growth rate is determined. Mutual interaction of spiral density waves should be taken into account when discussing the evolution of spiral arms in galaxies.

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