Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981azh....58..660s&link_type=abstract
Astronomicheskii Zhurnal, vol. 58, May-June 1981, p. 660-662. In Russian.
Astronomy and Astrophysics
Astronomy
2
Energy Transfer, Interstellar Masers, Water Masers, Cosmic Dust, Photons, Theorem Proving
Scientific paper
Goldreich and Kwan (1974) suggested that collisional pumping of cosmic H2O masers with energy sinks cannot assure a sink rate that is necessary for powerful sources. This paper presents a simple proof for the Goldreich-Kwan theorem for effectively thick media, and generalizes this theorem to several geometries not considered before. Conditions under which collisional pumping can assure the necessary sink rate are described.
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