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Date and Time of the Query: 2019-06-16 T09:38:21 PDT
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For refcode 1993ApJ...414..487C:
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Copyright by American Astronomical Society. Reproduced by permission
1993ApJ...414..487C A NEW WAY TO LOCATE COROTATION RESONANCES IN SPIRAL GALAXIES BLAISE CANZIAN Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218 Received 1992 December 28; accepted 1993 March 22 ABSTRACT 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. Subject headings: galaxies: kinematics and dynamics - galaxies: structure
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