Statistics – Computation
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...323..346k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 323, Dec. 1, 1987, p. 346-357. Research supported by Johns Hopkins Universi
Statistics
Computation
44
Galactic Nuclei, Interstellar Masers, Laser Pumping, Magnetohydrodynamic Waves, Particle Collisions, Water Masers, Computational Astrophysics, Maser Outputs, Population Inversion, Shock Waves
Scientific paper
The collisional pumping of water masers is studied. It is found that the strong water masers can be pumped collisionally in regions where the charged particles are at a significantly higher temperature than that of the neutral particles. Such conditions exist in the precursors of MHD shocks and in massive starburst galaxies and active nuclei. The ionization fraction required for this pumping mechanism to work is roughly equal to the ratio of the typical neutral particle collision rate to that of the charged particles, and it is therefore in the range 10 to the -5th to 10 to the -4th. A physical explanation of why population inversion in H2O molecules occurs under the above conditions is given, and the total power emitted is computed. Also, the efficiency for masing is determined as a function of ionization fraction and temperature difference between the charged and neutral particles.
Kylafis Nikolaos D.
Norman Colin
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