VLBI observations of the water vapor maser in the nucleus of NGC 3079

Details VLBI observations of the water vapor maser in the nucleus of NGC 3079 VLBI observations of the water vapor maser in the nucleus of NGC 3079

Jun 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...356..149h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 356, June 10, 1990, p. 149-155.

Astronomy and Astrophysics

Astrophysics

39

Galactic Nuclei, Interstellar Masers, Very Long Base Interferometry, Water Masers, Luminosity, Power Spectra, Star Formation, Water Vapor

Scientific paper

The water vapor maser source in the nucleus of NGC 3079 has been observed with a four-station intercontinental VLBI array, which had a resolution of 0.3 mas. VLA observations of NGC 3079 show that the maser source is coincident in angle with the compact continuum radio source in the nucleus of the galaxy to better than 5 mas. The water vapor maser source in NGC 3079 is comparable in size, but apparently 500 times more luminous than the brightest H20 maser source in the Galaxy, W49N, based on the assumption of isotropic emission. The small size and apparent high luminosity of this extragalactic source suggests special circumstances for the maser. A model is proposed wherein the maser is an unsaturated amplifier of the nuclear continuum source.

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