Astronomy and Astrophysics – Astronomy
Scientific paper
May 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978mnras.183..491s&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 183, May 1978, p. 491-500. Research supported by the Science Research C
Astronomy and Astrophysics
Astronomy
9
Astronomical Models, Hydroxyl Emission, Interstellar Masers, Radiative Transfer, Time Functions, Two Dimensional Bodies, Brightness Temperature, Computerized Simulation, Mathematical Models, Water Masers
Scientific paper
The time-dependent equations of radiative transfer are solved for a maser source much longer than it is wide. Transitions are assumed to occur between two energy levels only (this has previously been shown to be a justifiable approximation for the four-level hydroxyl (OH) maser, and is discussed briefly). It is found that the intensity may vary rapidly although the physical conditions in the masing region, including the rates of pumping and relaxation, are constant. Under certain circumstances the observed intensity of a saturated maser may vary quasi-periodically with large amplitude and a period (in years) equal to the maser length (in light years); the maser may seem to appear and disappear. All calculations are carried out for two of the four levels of the hydroxyl ground rotational-state maser, but the results are qualitatively valid for any system which is approximately equivalent to a two-level maser.
Middleton M. S.
Salem Michael
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