Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245..465l&link_type=abstract
Astrophysical Journal, Part 1, vol. 245, Apr. 15, 1981, p. 465-481.
Astronomy and Astrophysics
Astrophysics
40
Galactic Structure, Interstellar Gas, Molecular Clouds, Shock Waves, Spiral Galaxies, Stellar Evolution, Supernovae, Astronomical Models, Disk Galaxies, Gas Density, Gas Flow, Gravitational Effects
Scientific paper
A 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.
Levinson F. H.
Roberts William W. Jr.
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