Far-infrared rotational emission by carbon monoxide

Details Far-infrared rotational emission by carbon monoxide Far-infrared rotational emission by carbon monoxide

Aug 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...259..647m&link_type=abstract

Astrophysical Journal, Part 1, vol. 259, Aug. 15, 1982, p. 647-656.

Astronomy and Astrophysics

Astrophysics

136

Astronomical Spectroscopy, Carbon Monoxide, Far Infrared Radiation, Masers, Molecular Spectra, Cooling, Hydrogen, Molecular Collisions, Population Inversion

Scientific paper

Accurate theoretical collisional excitation rates are used to determine the emissivities of CO rotational lines for an H2 molecule content of at least 10,000/cu cm, temperature in the range 100-3000 K, and J not more than 60 under the assumption that the lines are optically thin. An approximate analytic expression for the emissivities which is valid in this region is obtained. Population inversions in the lower rotational levels occur for densities of molecular H2 around 1000-100,000/cu cm and temperatures T not more than about 50 K provided photon trapping is unimportant. Interstellar shocks observed edge-on are a potential source of weak millimeter-wave CO maser emission.

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