The role of a strong far-infrared radiation field in line excitation and cooling of photodissociation regions and molecular clouds

Details The role of a strong far-infrared radiation field in line excitation and cooling of photodissociation regions and molecular clouds The role of a strong far-infrared radiation field in line excitation and cooling of photodissociation regions and molecular clouds

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987japa....8..169q&link_type=abstract

Journal of Astrophysics and Astronomy (ISSN 0250-6335), vol. 8, June 1987, p. 169-181.

Astronomy and Astrophysics

Astronomy

1

Cooling, Far Infrared Radiation, Infrared Astronomy, Molecular Clouds, Photodissociation, Collision Parameters, Cosmic Dust, Fine Structure, Hydrogen Clouds, Nebulae, Radiation Distribution

Scientific paper

The paper presents a theoretical analysis of the effect of an FIR field from an H II region on the cooling of C and O atoms, C(+) ions, and CO molecules in a photodissociation region and a molecular cloud associated with the H II region at low temperatures (Tk not greater than 200 K). Cooling by species with low line-splitting (C I, C II, and CO) is influenced significantly by the radiation field for Tk less than 100 K, while the effect of the radiation field on cooling by O I is significant even at higher temperatures (greater than 100 K). It is also shown that, in an H I region, the dust grains play an important role in the gas heating only through photoelectron emission following irradiation by far-UV radiation, as the IR emission from the dust is too small to have a substantial effect on the cooling.

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