Structure of massive molecular clouds

Details Structure of massive molecular clouds Structure of massive molecular clouds

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984afz....21..147a&link_type=abstract

(Astrofizika, vol. 21, July-Aug. 1984, p. 147-161) Astrophysics (ISSN 0571-7132), vol. 20, no. 4, Jan. 1985, p. 441-450. Transla

Astronomy and Astrophysics

Astrophysics

5

Hydrogen Clouds, Hydrostatics, Interstellar Matter, Molecular Clouds, Thermal Energy, Turbulence Effects, Chemical Equilibrium, Cosmic Rays, Energy Dissipation, Gas Density, Gas Pressure, Gravitational Effects, Photoelectrons

Scientific paper

A numerical model of the structure of a massive molecular cloud, maintained in equilibrium by turbulence pressure, is presented. It is shown that the line-of-sight density of a cloud must exceed about 5 x 10 to the 20th per sq cm in order to create conditions for the formation of dense and cold regions; the surrounding envelope of the cloud has a low density (2-5 per cu cm), and the temperature inside is more than 100 C. Models in which the turbulence energy of the cloud is approximately equal to the thermal energy were also constructed, and these were found to agree best with the observational data. On the basis of the model estimates of molecular cloud structure, it is concluded that massive molecular clouds are in an equilibrium state and may be extremely old formations. The equations describing the model are given in abbreviated form in an appendix.

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