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A cloud/particle model of the interstellar medium - Galactic spiral structureA cloud/particle model for gas flow in galaxies is developed that incorporates cloud-cloud collisions and supernovae as dominant local processes. Cloud-cloud collisions are the main means of dissipation. To counter this dissipation and maintain local dispersion, supernova explosions in the medium administer radial snowplow pushes to all nearby clouds. The causal link between these processes is that cloud-cloud collisions will form stars and that these stars will rapidly become supernovae. The cloud/particle model is tested and used to investigate the gas dynamics and spiral structures in galaxies where these assumptions may be reasonable. Particular attention is given to whether large-scale galactic shock waves, which are thought to underlie the regular well-delineated spiral structure in some galaxies, form and persist in a cloud-supernova dominated interstellar medium; this question is answered in the affirmative.
Document ID
19810050781
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Levinson, F. H. (Virginia, University Charlottesville, Va., United States)
Roberts, W. W., Jr. (Virginia, University Charlottesville; Institute for Computer Applications in Science and Engineering, Hampton, Va., United States)
Date Acquired
August 11, 2013
Publication Date
April 15, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAS1-15810
CONTRACT_GRANT: NSF AST-79-09935
CONTRACT_GRANT: NAS8-33348
Distribution Limits
Public
Copyright
Other