Unstable Spiral Modes in Disk-Shaped Galaxies: A General Fluid Dynamical Theory with Some Preliminary Results

Details Unstable Spiral Modes in Disk-Shaped Galaxies: A General Fluid Dynamical Theory with Some Preliminary Results Unstable Spiral Modes in Disk-Shaped Galaxies: A General Fluid Dynamical Theory with Some Preliminary Results

Jan 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pnas...76....4p&link_type=abstract

Proceedings of the National Academy of Sciences of the United States of America, Volume 76, Issue 1, pp. 4-7

Physics

9

Scientific paper

A numerical scheme has been devised to calculate discrete spiral modes in a fluid-dynamical model of disk galaxies. The procedure is free from the usual restrictions imposed upon the asymptotic theory. A radiation condition has been formulated as one of the boundary conditions. For a test model galaxy with moderately low surface density, quantitative agreement is found between the asymptotic spiral modes and the corresponding ones obtained from the present scheme. The present scheme should find ready application to the study of open spiral modes.

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