A Survey for H2O Megamasers III. Monitoring Water Vapor Masers in Active Galaxies

Details A Survey for H2O Megamasers III. Monitoring Water Vapor Masers in Active Galaxies A Survey for H2O Megamasers III. Monitoring Water Vapor Masers in Active Galaxies

2003-02-12

arxiv.org/abs/astro-ph/0302248v1

Astronomy and Astrophysics

Astrophysics

accepted by ApJS

Scientific paper

10.1086/374417

We present single-dish monitoring of the spectra of 13 extragalactic water megamasers taken over a period of 9 years and a single epoch of sensitive spectra for 7 others. Our data include the first K-band science observations taken with the new 100 m Green Bank Telescope (GBT). In the context of a circumnuclear, molecular disk model, our results suggest that either (a) the maser lines seen are systemic features subject to a much smaller acceleration than present in NGC 4258, presumably because the gas is farther from the nuclear black hole, or (b) we are detecting ``satellite'' lines for which the acceleration is in the plane of the sky. We also report a search for water vapor masers towards the nuclei of 58 highly inclined, nearby galaxies.

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