A new way to locate corotation resonances in spiral galaxies

Details A new way to locate corotation resonances in spiral galaxies A new way to locate corotation resonances in spiral galaxies

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...414..487c&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 414, no. 2, p. 487-492.

Mathematics

Logic

69

Corotation, Galactic Rotation, Galactic Structure, Spiral Galaxies, Astronomical Models, Barred Galaxies, Density Wave Model, H I Regions, Velocity Distribution

Scientific paper

Kinematical information over the entire disk of a spiral galaxy can be used in a new way to locate the position of the corotation resonance. The spiral residual velocity field has a global appearance that is distinctly different inside and outside the corotation resonance radius. Inside the corotation radius, the spiral velocity field shows a single spiral feature (that is, a single approaching-receding 'spiral arm' pair). Outside the corotation radius, there are three spiral features (approaching-receding arm pairs). The corotation radius is located where this morphological change occurs. The effect is a consequence of geometric phase. It should apply generally, regardless of the functional form of the velocity perturbation due to a spiral arm, if the spiral structure is wave-based.

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