Ammonia as a molecular cloud thermometer

Details Ammonia as a molecular cloud thermometer Ammonia as a molecular cloud thermometer

Jun 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983a%26a...122..164w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 122, no. 1-2, June 1983, p. 164-170.

Physics

Condensed Matter

Statistical Mechanics

210

Ammonia, Gas Temperature, Interstellar Gas, Molecular Clouds, Molecular Rotation, Temperature Measurement, Equilibrium Equations, Galactic Nuclei, Kinetic Energy, Metastable State, Statistical Mechanics, Thermometers

Scientific paper

The populations of the rotation levels of ammonia under interstellar conditions are determined by means of statistical equilibrium calculations considering all levels up to approximately 500/cm above ground in the cases of both orthoand para-NH3. While it is noted that the NH3 rotation temperature between metastable levels often considerably underestimates the kinetic temperature, even when such relatively highly excited levels as the (4, 4) are considered, the use of computations to derive kinetic temperatures in nearby molecular clouds establishes relatively good agreement with kinetic temperatures obtained from CO. It is concluded that useful temperature determinations can be made on the basis of corrected NH3 results.

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