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The Shapes and Supersonic Motions of Molecular Clouds

Koda, Jin (2008) The Shapes and Supersonic Motions of Molecular Clouds. In: Mapping the Galaxy and nearby galaxies. Astrophysics and Space Science Proceedings. Springer , New York, pp. 105-110. ISBN 978-0-387-72768-4. https://resolver.caltech.edu/CaltechAUTHORS:20100812-143306648

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Abstract

The energy source and mechanism for driving the supersonic motions in molecular clouds remain unknown. The unknown driving mechanism must exert an influence on the shape of molecular clouds [5]. We analyzed a sample of more than 500 molecular clouds identified with the BU-FCRAO Galactic Ring Survey (YRS) data, and found that they are preferentially elongated along the Galactic plane. Their spin axes are randomly oriented; therefore, we conclude that the elongation is supported by internal velocity anisotropy, but not by spin. The mechanism for driving the supersonic velocity dispersion must also account for the preferred elongation. This excludes some suggested mechanism, such as stellar winds and supernovae, because they do not produce the systemic elongation. Driving energy is more likely to come from large-scale motions, such as Galactic rotation.


Item Type:Book Section
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1007/978-0-387-72768-4_15DOIArticle
https://link.springer.com/chapter/10.1007%2F978-0-387-72768-4_15PublisherArticle
http://rdcu.be/siWzPublisherFree ReadCube access
ORCID:
AuthorORCID
Koda, Jin0000-0002-8762-7863
Additional Information:© 2008 Springer.
Series Name:Astrophysics and Space Science Proceedings
Record Number:CaltechAUTHORS:20100812-143306648
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20100812-143306648
Official Citation:Koda J. (2008) The Shapes and Supersonic Motions of Molecular Clouds. In: Wada K., Combes F. (eds) Mapping the Galaxy and Nearby Galaxies. Astrophysics and Space Science Proceedings. Springer, New York, NY
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:19416
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:13 Aug 2010 21:51
Last Modified:03 Oct 2019 01:56

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