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The Discovery of H2O Maser Emission in Seven Active Galactic Nuclei and at High Velocities in the Circinus Galaxy

Citation

Greenhill, LJ and Kondratko, PT and Lovell, JEJ and Kuiper, TBH and Moran, JM and Jauncey, DL and Baines, GP, The Discovery of H2O Maser Emission in Seven Active Galactic Nuclei and at High Velocities in the Circinus Galaxy, The Astrophysical Journal, 582, (1) pp. L11-L14. ISSN 0004-637X (2003) [Refereed Article]

DOI: doi:10.1086/367602

Abstract

We report the discovery of H2O maser emission at 1.35 cm wavelength in seven active galactic nuclei (at distances of up to 80 Mpc) during a survey conducted at the 70 m diameter antenna of the NASA Deep Space Network near Canberra, Australia. The detection rate was ∼4%. Two of the maser sources are particularly interesting because they display satellite high-velocity emission lines, which are a signature of emission from the accretion disks of supermassive black holes when seen edge-on. Three of the masers are coincident, to within uncertainties of 0″.2, with continuum emission sources that we observed at about λ = 1.3 cm. We also report the discovery of new spectral features in the Circinus galaxy H2O maser that broaden the known velocity range of emission therein by a factor of ∼1.7. If the new spectral features originate in the Circinus accretion disk, then molecular material must survive at radii ∼3 times smaller than had been believed previously (∼0.03 pc or ∼2 × 105 Schwarzschild radii).

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical and Space Sciences
Research Field:Galactic Astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Physical Sciences
Author:Lovell, JEJ (Dr Jim Lovell)
ID Code:46649
Year Published:2003
Web of Science® Times Cited:66
Deposited By:Physics
Deposited On:2007-08-28
Last Modified:2011-11-29
Downloads:0

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