A self-regulated state for the interstellar medium - Radial dependence in the galactic plane

Details A self-regulated state for the interstellar medium - Radial dependence in the galactic plane A self-regulated state for the interstellar medium - Radial dependence in the galactic plane

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...250...70p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 250, no. 1, Oct. 1991, p. 70-83. Research supported by EEC and Universidad de

Astronomy and Astrophysics

Astrophysics

8

Galactic Structure, Interstellar Matter, Star Formation, Disk Galaxies, Interstellar Gas, Molecular Clouds, Radial Distribution

Scientific paper

On the assumption that two regulating mechanisms act simultaneously, the radial dependence in the Galactic plane of the star formation rate (SFR) and the value of various variables related to the state of the interstellar medium are calculated in an effort to prove that the warm gas in the Galactic plane is in a state close to that of marginal stability for the warm gas - small clouds transition in the isobaric mode. This hypothesis makes it possible to predict the radiation density in the 912-110-A band, the thermal pressure, and the temperature and fractional ionization of both. The mechanism of self-regulation is described. Results are presented for the radial dependence in the Galactic disk of: the self-regulated state of the warm gas and small cloud cores, the self-regulated star formation rate, and the regulated state of the molecular phase. The dependence of the model results on the input data is discussed.

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