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Title:
A GBT Snapshot Survey for Water Megamasers in Nearby Galaxies
Authors:
Gugliucci, Nicole E.; Braatz, J. A.
Affiliation:
AA(Univ. of Virginia), AB(National Radio Astronomy Observatory)
Publication:
American Astronomical Society, AAS Meeting #211, #95.28; Bulletin of the American Astronomical Society, Vol. 39, p.899
Publication Date:
12/2007
Origin:
AAS
Bibliographic Code:
2007AAS...211.9528G

Abstract

Extragalactic water masers have become important astrophysical probes of the central regions of active galactic nuclei. A science team from NRAO, CfA, and MPIfR have formed the Megamaser Cosmology Project to use megamasers in the disks of AGN to determine the geometrical distances to the host galaxies. As a precursor to this project, we undertook an unbiased "snapshot" survey of nearby, bright galaxies to search for water megamasers that could be imaged with Very Long Baseline Interferometry. We present detections from eight galaxies from this snapshot survey taken with the Green Bank Telescope. One source, UGC 3789, has a maser profile consistent with disk emission from masers near the systemic velocity and "high velocity" features representing the redshifted and blueshifted emission from the accretion disk. This galaxy was not previously classified as an AGN, but was later identified optically as a Seyfert 2. Other detected sources show masers associated with star formation or AGN.
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