Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...243..239k&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 243, no. 1, March 1991, p. 239-243.
Astronomy and Astrophysics
Astrophysics
4
Galactic Mass, Galactic Structure, Interstellar Matter, Molecular Clouds, Star Formation Rate, Early Stars, Star Clusters, Thermal Instability
Scientific paper
The formation of a dense cold core inside superclouds during their development through gravitational instability of the galactic disk is considered. It is shown that the principal role in this process is played by the thermal properties of dilute warm interstellar matter that fills the volume of the supercloud. Inside the forming supercloud a density distribution increasing toward the center is created, and as a result the gas cools near the center and contracts by self-gravitation into a cold dense core. Utilizing equilibrium isothermal models in the description of differentially rotating superclouds demonstrates that the conditions for dense core formation can develop only in superclouds of masses of about 10 to the 7th solar masses.
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