Statistics – Computation
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...292..181t&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 181-187.
Statistics
Computation
22
Computational Astrophysics, Interstellar Gas, Jeans Theory, Molecular Clouds, Phase Transformations, Star Formation, Angular Velocity, Gibbs Free Energy, Magnetohydrodynamics, Milky Way Galaxy, Rotating Environments
Scientific paper
The use of second-order tensor virial equations to obtain analytical descriptions of rotating isothermal equilibrium sequences is reviewed, and their significance when dynamical instabilities are taken into account is considered. It is shown that along every rotating, isothermal, equilibrium sequence that permits a Jeans-type instability, a nondynamical phase transition to the higher-density, disk-like equilibrium sequence is also available. The transition changes a diffuse gas cloud into a compact structure closer to the stellar state, and occurs at masses smaller than the Jeans mass. The ratio of the phase transition mass to the Jeans mass is very sensitive to the specific angular momentum contained in a diffuse cloud. The existence of such an allowed phase transition in diffuse gas clouds opens up the possibility that star formation may not always proceed by a dynamical transition.
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