Corotation Resonance: UGC 2885 and a New Method
Abstract
Kinematic data on the minor axis of the giant sprial galaxy UGC 2885 show a change in the sign of the raidal 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. (SECTION: Workshop on Resonance Phenomena in Spiral Galaxies )
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- June 1993
- DOI:
- 10.1086/133215
- Bibcode:
- 1993PASP..105..661C
- Keywords:
-
- Corotation;
- Galactic Structure;
- Morphology;
- Orbital Resonances (Celestial Mechanics);
- Radial Velocity;
- Spiral Galaxies;
- Azimuth;
- H Alpha Line;
- Line Of Sight;
- Pixels;
- Signal To Noise Ratios;
- Astrophysics;
- GALAXIES: SPIRAL;
- GALAXIES: INDIVIDUAL: UGC 2885;
- GALAXIES: KINEMATICS AND DYNAMICS