Abstract
view Abstract Citations (35) References (22) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS On Pumping Astronomical Masers Kylafis, N. D. ; Norman, C. Abstract The possibility that astronomical masers are pumped collisionally in regions where the charged particle temperature is larger than that of the neutral particles is examined. Such conditions occur naturally in the magnetic precursors of MHD shocks. A condition for masing which depends on the collisional rate coefficients and the fractional ionization only is derived analytically. An important advantage of this pumping mechanism over other pumps is that non-LTE collisions can produce greater power than ordinary pumping schemes for similar conditions. In this inherently non-LTE process, thermalization does not occur no matter how high the density is, as long as the ionization fraction is approximately equal to the ratio of the collision rate coefficient due to the neutral particles to that due to the electrons. An application of this pumping mechanism to H2O masers is presented. Publication: The Astrophysical Journal Pub Date: January 1986 DOI: 10.1086/184606 Bibcode: 1986ApJ...300L..73K Keywords: Collision Rates; Interstellar Masers; Particle Collisions; Magnetohydrodynamics; Molecular Collisions; Shock Waves; Thermodynamic Equilibrium; Water Masers; Astrophysics; HYDROMAGNETICS; INTERSTELLAR: MOLECULES; MASERS; SHOCK WAVES full text sources ADS |
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