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Molecular Spiral Arms in M51 at 2.5″ Resolution

Published online by Cambridge University Press:  03 August 2017

Richard J. Rand
Richard J. Rand*
Affiliation:
California Institute of Technology, 105-24 Pasadena, CA 91125

Abstract

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We present maps of CO emission in M51 made with the Owens Valley Millimeter Interferometer. We first summarize the results from our mosaic map at 8″ resolution covering the disk of M51. We then present a map of two 1′ fields along the spiral arm south of the nucleus at 2.5″ resolution. The Giant Molecular Associations (GMAs) seen in our 8″ map are found to have substructure at the higher resolution. The interarm GMAs have a particularly patchy structure. The streaming motions found from our 8′ map are confirmed at this resolution. The velocity dispersion along the arms is about 10 km s—1. Possible explanations are given for the poor small-scale correlation of the Hα and CO emission.

Type
III- Observations of Spiral Structure
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 73 - 75
Copyright
Copyright © Kluwer 1991 

References

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