Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.198..991f&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 198, Mar. 1982, p. 991-1006.
Astronomy and Astrophysics
Astronomy
7
Brightness Temperature, Hydroxyl Emission, Interstellar Masers, Molecular Clouds, Quantum Mechanics, Doppler Effect, Gravitational Collapse, Interstellar Matter, Kinematic Equations, Quantum Theory, Radiation Distribution, Water Masers
Scientific paper
Expressions obtained by applying quantum electronics methods are used to calculate interstellar maser brightness temperatures, which are compared with observational data for W3(OH) at 1665 and 1667 MHz and found to be in agreement with the values observed above ten trillion K. It is shown through comparisons with the rate-equation method of calculation that the two theories lead, in the case of the unsaturated laser, to nearly identical expressions for maser brightness temperatures. The quantum electronics theory, however, stresses the importance of the ambient radiation field through its influence on the homogeneous line width. By means of this theory, in addition, the phenomenon of kinematic compression of the Doppler width in circumstellar regions under gravitational collapse is introduced into maser brightness temperature studies for the first time.
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