Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26as...42...59k&link_type=abstract
Astronomy and Astrophysics Supplement Series, vol. 42, Oct. 1980, p. 59-67. Deutsche Forschungsgemeinschaft
Astronomy and Astrophysics
Astrophysics
13
Carbon Monoxide, High Temperature Gases, Molecular Excitation, Population Inversion, Thermodynamic Equilibrium, Brightness Temperature, Gas Density, Hydrogen, Kinetic Theory, Molecular Collisions, Radiative Transfer
Scientific paper
An investigation was made of the kinetic temperature, H2 density, and CO column density of the CO molecule which shows suprathermal excitation and population inversion. The calculations use a model in which excitation results from collisions with H2 molecules; the radiative transfer in the molecular lines is treated in on-the-spot approximation to maintain the computing time sufficiently short and investigate a range of parameters. For the J equals 1 - 0 line the suprathermal excitation was greater than 20 K, and the population inversion was greater than 50 K; the H2 densities were 10000/cu cm. Most of the observed clouds have physical conditions which permit LTE analysis; however, it was expected that this analysis will underestimate the CO column density in clouds of lower density.
Kegel Wilhelm H.
Koeppen Joachim
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