The thermal model of a nonuniform molecular cloud with an IR source at the center.

Details The thermal model of a nonuniform molecular cloud with an IR source at the center. The thermal model of a nonuniform molecular cloud with an IR source at the center.

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989acasn..30..262t&link_type=abstract

Acta Astron. Sin., Vol. 30, No. 3, p. 262 - 275

Astronomy and Astrophysics

Astronomy

Molecular Clouds: Infrared Sources

Scientific paper

The energy equilibrium of molecular clouds with an IR source at the center is studied allowing the nonuniformity in density distribution. The thermal model of this kind of clouds is set up, in which several cooling and heating processes are considered, such as radiative cooling (or heating) by CO and H2O molecules, heating by dust-gas collisions, heating due to gravitational contraction, and cosmic-ray heating. Six spherical models are constructed by varying two model parameters, i.e., the index of density-law and the optical thickness at the center. The relative importance of different heating/cooling mechanisms changes considerably from region to region. The water molecule is always a coolant and the dominant one in the innermost region. The CO molecule generally works as a coolant, but it may play a role of gas-heating agent under some physical conditions.

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