Density wave amplitude and the mechanism of long-term maintenance in spiral galaxies

Details Density wave amplitude and the mechanism of long-term maintenance in spiral galaxies Density wave amplitude and the mechanism of long-term maintenance in spiral galaxies

Oct 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976scisn..19..665l&link_type=abstract

Scientia Sinica, vol. 19, Sept.-Oct. 1976, p. 665-674.

Astronomy and Astrophysics

Astronomy

3

Astronomical Models, Density Wave Model, Galactic Structure, Gas Dynamics, Spiral Galaxies, Asymptotic Methods, Disks (Shapes), Galactic Evolution, Long Term Effects, Maintenance

Scientific paper

The spiral structure observed in many disk-shaped galaxies has been successfully explained in terms of the density-wave theory. The main issue remaining is the search for a mechanism or mechanisms for the origin and long-term maintenance of such density-wave patterns. Starting from the gasdynamic equation for disk-shaped galaxies, the amplitude distribution of the density waves over the whole gas disk is obtained through a uniformly valid second-order asymptotic approximation. A mechanism for the long-term maintenance of these density waves is also suggested.

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