Corotation resonance - UGC 2885 and a new method

Details Corotation resonance - UGC 2885 and a new method Corotation resonance - UGC 2885 and a new method

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105..661c&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 688, p. 661-663.

Astronomy and Astrophysics

Astronomy

7

Corotation, Galactic Structure, Morphology, Orbital Resonances (Celestial Mechanics), Radial Velocity, Spiral Galaxies, Azimuth, H Alpha Line, Line Of Sight, Pixels, Signal To Noise Ratios

Scientific paper

Kinematic data on the minor axis of the giant spiral galaxy UGC 2885 show a change in the sign of the radial velocity across spiral arms. Such a sign change indicates that corotation has been crossed. In fact, two sign changes are seen, implying that there are two spiral patterns. The morphology of the galaxy supports this interpretation. A general method is also presented that can be used to locate the corotation resonance in a grand design spiral galaxy. The method relies on the effects of geometric phase, and assumes only that the spiral flow is wave based and periodic in azimuth.

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