Rapid variability of H2O masers in Cepheus A

Details Rapid variability of H2O masers in Cepheus A Rapid variability of H2O masers in Cepheus A

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..233r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 1, 1986, p. 233-251.

Astronomy and Astrophysics

Astronomy

43

Astronomical Spectroscopy, Line Spectra, Nebulae, Periodic Variations, Spectral Energy Distribution, Water Masers, Interstellar Matter, Stellar Evolution

Scientific paper

Spectacular variations are reported in the 22-GHz H2O maser emission from Cepheus A; the time scales for spectral features to change by a factor of 2 were as short as 2.4 days. A number of features exhibited correlated variations which are presently interpreted as due to variations in a common radiatively coupled maser pump. A maser flare was observed in March, 1983 in which a rapid, unsaturated rise with no line narrowing was followed by saturation and a slow fall, during which the line broadened. The observed variability puts constraints on possible pumping schemes for the masers, and furnishes strong support for the hot dust-cold gas scheme.

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