Evolution and propagation of density waves on galactic disk. II - an approximation of the thin transition layer

Details Evolution and propagation of density waves on galactic disk. II - an approximation of the thin transition layer Evolution and propagation of density waves on galactic disk. II - an approximation of the thin transition layer

Jan 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986sssmp..29...67x&link_type=abstract

Scientia Sinica, Series A - Mathematical, Physical, Astronomical and Technical Sciences (ISSN 0253-5831), vol. 29, Jan. 1986, p.

Other

Density Wave Model, Galactic Structure, Transition Layers, Wave Propagation, Wave Amplification, Wave Dispersion, Wave Packets, Wave Reflection

Scientific paper

The evolution and propagation of a density wavelet on a galactic disk are investigated analytically, applying a thin-transition-layer approximation. Wave-packet trajectories, swing amplifications, and overreflection rates are determined for two classes of basic states, and the results of swing theory are compared with those of the sheet model of Goldreich and Lynden-Bell (1965). Agreement is found for one class of basic states, while the significant deviation found for the other class is attributed to inadequacies in sheet theory.

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