Statistics – Applications
Scientific paper
May 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...427..384e&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 427, no. 1, p. 384-387
Statistics
Applications
71
Applications Of Mathematics, Magellanic Clouds, Molecular Clouds, Star Formation, Angular Velocity, Space Density, Thermal Radiation, Velocity Distribution
Scientific paper
Collapse conditions for large expanding shells and rings in a disk galaxy are derived and shown to lead to a condiditon for star formation that is similar to the condition Q less than 1 for spontaneous instabilities. This result implies that both spontaneous and stimulated star formation are sensitive to Q, and that the observation of a critical surface density for star formation that is based on Q does not necessarily imply that star formation results from large-scale quiescent instabilities. The results also suggest that in regions with high gas densities and high rotation rates, such as starburst galaxy nuclei, the normal balance between stimulated and spontaneous star formation mechanisms could shift to give a higher proportion of stars forming in shells and other swept-up debris, and less in giant cloud complexes containing the local Jeans mass.
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