Energy loss rates for water in molecular clouds

Details Energy loss rates for water in molecular clouds Energy loss rates for water in molecular clouds

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...253..537c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 253, no. 2, Jan. 1992, p. 537-540.

Astronomy and Astrophysics

Astrophysics

Energy Dissipation, Interstellar Matter, Kinetic Heating, Molecular Clouds, Radiative Transfer, Water, Hydrogen Clouds, Ortho Para Conversion

Scientific paper

The energy loss rate coefficients for water in interstellar molecular clouds were calculated. For para-H2O, ten rotational levels connected by 16 radiative transitions were considered and the calculations were done for the kinetic temperature up to 100 K. For ortho-H2O, 31 rotational levels connected by 92 radiative transitions were considered and the calculations were done for the kinetic temperature up to 300 K. For the number density of molecular hydrogen, nH, up to 10 exp 6/cu cm, the coefficients were found to be independent of nH2. The coefficients are expressed in the analytical forms as a function of kinetic temperature in the cloud. It was found that, for the kinetic temperature T greater than 100 K, the rates for ortho-H2O may be used as the rates for water. But at low temperature T less than 100 K, the contributions of both ortho- and para-H2O should be accounted to calculate the energy loss rates for water.

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