Multiple patterns in spiral and barred galaxies

Details Multiple patterns in spiral and barred galaxies Multiple patterns in spiral and barred galaxies

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..648s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 688, p. 648-650.

Other

6

Barred Galaxies, Orbital Resonances (Celestial Mechanics), Resonant Frequencies, Spiral Galaxies, Disk Galaxies, Galactic Structure

Scientific paper

Our ability to locate resonances of spiral patterns in galaxies is severely limited if spirals are short lived and if many patterns co-exist in the same galaxy. Theoreticians are currently divided on the basic question of whether spiral patterns are long lived, but I argue that multiple, short-lived patterns are to be expected. Bars, on the other hand, seem to be truly long-lived features and a plausible case can be made that rings in barred galaxies are located at resonances. Even in barred galaxies, however, spirals appear to have a pattern speed that differs from that of the bar.

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