Two-temperature pumping of H2O masers

Details Two-temperature pumping of H2O masers Two-temperature pumping of H2O masers

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347l..35e&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. L35-L38.

Astronomy and Astrophysics

Astrophysics

8

Interstellar Masers, Maser Pumping, Water Masers, Abundance, Brightness Distribution, Far Infrared Radiation

Scientific paper

Detailed calculations, including optical depth effects, are presented for the pumping of H2O masers by collisions with neutrals and electrons held at two different temperatures. The proposal by Strelnitskij (1980) that such pumping can result in arbitrarily high brightness temperatures is corroborated, but only when the electrons are cooler than the neutrals. When the neutrals are cooler than the electrons, the inversion is less efficient than what would be obtained by single-temperature pumping with any of the individual species alone.

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