Other
Scientific paper
Aug 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976azh....53..728s&link_type=abstract
Astronomicheskii Zhurnal, vol. 53, July-Aug. 1976, p. 728-741. In Russian.
Other
13
Interstellar Masers, Pumping, Shock Fronts, Water Masers, Astronomical Models, Cosmic Dust, Molecular Collisions, Molecular Energy Levels, Molecular Rotation, Particle Density (Concentration), Population Inversion
Scientific paper
The possibility of collisional pumping of an interstellar H2O maser behind a circumstellar shock front is investigated using a homogeneous and isothermal layer with finite optical thickness to H2O rotational lines as a model of the pump region. The steady-state equations for the populations of 48 to 60 rotational levels of ortho-H2O and the transfer equations for 106 to 142 of the strongest transitions among these levels are solved simultaneously by computer. The results show that inversion of the 6(16)-5(23) transition (and of many other rotational transitions) occurs over a wide range of excited-particle densities at kinetic temperatures of about 500 to 1000 K and is virtually independent of the layer's optical thickness. It is concluded that the main cause of inversion is cascade deactivation of high rotational levels excited during collisions and that the required densities and kinetic temperatures can be realized in a shock wave propagating through a dense circumstellar shell of gas and dust. A possible geometric model of a strong maser source is considered.
Muzylev V. V.
Shmeld I. K.
Strelnitskii V. S.
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