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

Abstract

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.

arXiv commentaccepted by ApJS

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Cited by in corpus (37)

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• Positional Coincidence of H2O Maser and a Plasma Obscuring Torus in Radio Galaxy NGC 1052
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• Optical Properties of Host Galaxies of Extragalactic Nuclear Water Masers
• First Detection of Millimeter/Submillimeter Extragalactic H2O Maser Emission
• Using evolutionary algorithms to model relativistic jets: Application to NGC 1052
• A Massive Molecular Torus inside a Gas-Poor Cirnumnuclear Disk in the Radio Galaxy NGC 1052 Discovered with ALMA
• A Search for H2O Megamasers in High-z Type-2 AGNs
• Submillimeter H2O Maser in Circinus Galaxy - A New Probe for the Circumnuclear Region of Active Galactic Nuclei
• Sub-arcsecond imaging of the water emission in Arp 220
• AGN Feedback Through Multiple Jet Cycles in the Seyfert Galaxy NGC 2639
• A Deep 0.3-10 keV Spectrum of the H${}_2$O Maser Galaxy IC 2560
• Submillimeter H${}_2$O megamasers in NGC 4945 and the Circinus galaxy
• Search for sub-millimeter H2O masers in active galaxies - the detection of a 321 GHz H2O maser in NGC4945
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• Detection of brown dwarf-like objects in the core of NGC3603
• Spatially Resolved HCN Absorption Features in the Circumnuclear Region of NGC 1052
• On the X-ray Properties of OH Megamaser Sources: Chandra Snapshot Observations
• The innermost region of the water megamaser radio galaxy 3C403
• 183 GHz water megamasers in active galactic nuclei: a new accretion disk tracer
• Water vapour at high redshift: Arecibo monitoring of the megamaser in MG J0414+0534
• Megamaser detection and nuclear obscuration in Seyfert galaxies
• VLBI observations of the H2O gigamaser in TXS2226-184
• Second Epoch ALMA Observations of 321 GHz Water Maser Emission in NGC 4945 and the Circinus Galaxy
• Probing Jet-Torus Interaction in the Radio Galaxy NGC 1052 by Sulfur-Bearing Molecules
• ALMA Detection of 321 GHz water maser emission in the radio galaxy NGC 1052
• High-Resolution Imaging of Water Maser Emission in the active galaxies NGC 6240 and M51
• Two Epochs of Very Large Array Observations of Water Maser Emission in the active galaxy NGC 6240
• Water megamaser and central black hole masses in a large sample of galaxies
• H_2O maser and a plasma obscuring torus in the radio galaxy NGC 1052
• Long term Arecibo monitoring of the water megamaser in MG J0414+0534