Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...335l..19n&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 335, Dec. 1, 1988, p. L19-L22. NASA-NSF-supported research.
Astronomy and Astrophysics
Astrophysics
26
Astronomical Spectroscopy, Interstellar Masers, Spectrum Analysis, Velocity Distribution, H Ii Regions, Line Spectra, Radiation Spectra, Radiative Transfer, Stellar Envelopes, Water Masers
Scientific paper
The emergent radiation spectrum is obtained for an astrophysical maser in the presence of a velocity gradient without making the 'large velocity gradient' (or 'Sobolev') approximation on which previous calculations have been based. Even in the presence of a velocity gradient, the spectral lines of saturated masers are found to remain narrow. More surprisingly, however, the spectrum breaks up into multiple narrow lines. Hence, individual features in the observed spectra of astrophysical masers need not always be interpreted as separate clumps of gas. Specifically, this result may be related to the occurrence of multiple lines from the same location in the H2O masers in star-forming regions and to be the occurrence of numerous, narrow features recently detected in the spectra of circumstellar OH masers.
Nedoluha Gerald E.
Watson William D.
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