Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989pazh...15..603s&link_type=abstract
Pis'ma v Astronomicheskii Zhurnal (ISSN 0320-0108), vol. 15, July 1989, p. 603-610. In Russian. In Russian.
Astronomy and Astrophysics
Astronomy
Free Electrons, Interstellar Masers, Particle Collisions, Shock Waves, Water Masers, Distribution Functions, Electron Energy, Magnetohydrodynamic Waves, Radiation Sources, Shock Fronts
Scientific paper
The kinetic analysis of collisional processes controlling the thermal state of free low-energy electrons in a dense slightly ionized molecular condensation is carried out. It is shown that free electrons may be cooler than the thermalized neutrals by about 2 percent in the 1000-3000 K temperature range due to losses of energy on the excitation of H2O vibrational levels. It is shown that this temperature difference is sufficient for the inversion of the 6(16)-5(23) (a wavelength of 1.35 cm) H2O maser transition; however, it is too small to explain the observed radiation fluxes from the most powerful maser sources.
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