Time variation of type I H2O masers. I - Long term flux density variation of the W 49N H2O maser. II - A preliminary model for the time variation of H2O masers in ordinary, physically quiet environments

Details Time variation of type I H2O masers. I - Long term flux density variation of the W 49N H2O maser. II - A preliminary model for the time variation of H2O masers in ordinary, physically quiet environments Time variation of type I H2O masers. I - Long term flux density variation of the W 49N H2O maser. II - A preliminary model for the time variation of H2O masers in ordinary, physically quiet environments

Jun 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989a%26a...216..165p&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 216, no. 1-2, June 1989, p. 165-184.

Astronomy and Astrophysics

Astrophysics

8

H Ii Regions, Interstellar Masers, Temporal Distribution, Water Masers, Autocorrelation, Flux Density, Molecular Clouds, Very Long Base Interferometry

Scientific paper

The flux density variations for five features in the W 49 N H2O maser occurring during the 1969-1978 period are explored. It is shown that the flux density variation of a maser cloudlet can be decomposed into a large amplitude variation and some frequent irregular fluctuations about a constant flux density level. In the second part, a model for describing the flux density variation of type I H2O masers in an ordinary physically quiet environment is proposed which is valid for a wide range of time scales (100 s to 10 to the 8th s). With a constant maser pumping rate, flux density variations can be attributed to the rotation of the whole maser, the possible spin of the maser cloudlets, or Kelvin-Helmholtz instability occurring on the surface of the cloudlet.

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