A Survey for H 2 O Megamasers. III. Monitoring Water Vapor Masers in Active Galaxies | Zendy

J. A. Braatz | Zendy; A. S. Wilson | Zendy; C. Henkel | Zendy; R. G. Gough | Zendy; M. W. Sinclair | Zendy

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A Survey for H ₂ O Megamasers. III. Monitoring Water Vapor Masers in Active Galaxies

Author(s) -

J. A. Braatz,

A. S. Wilson,

C. Henkel,

R. G. Gough,

M. W. Sinclair

Publication year - 2003

Publication title -

the astrophysical journal supplement series

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.546

H-Index - 277

eISSN - 1538-4365

pISSN - 0067-0049

DOI - 10.1086/374417

Subject(s) - maser , galaxy , megamaser , water vapor , active galactic nucleus , astrophysics , physics , astronomy , environmental science , meteorology

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

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