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Title: Water-vapor maser survey for active galactic nuclei: A megamaser in NGC 6926
Authors: Sato, Naoko
Yamauchi, Aya
Ishihara, Yuko
Sorai, Kazuo
Kuno, Nario
Nakai, Naomasa
Balasubramanyam, R.
Hall, Peter
Keywords: Galaxies: active
galaxies: individual (NGC 6240, NGC 6926)
Galaxies: Seyfert
Galaxies - radio lines
Issue Date: Aug-2005
Publisher: Astronomical Society of Japan
Citation: Publications of the Astronomical Society of Japan, 2005, Vol.57, No.4, p. 587-594
Abstract: We made a survey of water-vapor maser emission for 93 AGNs with the Nobeyama 45-m and Mopra 22-m telescopes from 1999 to 2002. A megamaser was detected in a Seyfert 2 galaxy, NGC 6926, at a distance of 80Mpc, in 2002 June. [Greenhill et al. (2003a) have also reported a detection of the megamaser at the close date.] The peak flux density was 110mJy, and the total isotropic luminosity was 340 Lȯ. The maser shows triply peaked spectrum, suggesting an edge-on disk. A narrow-line feature of the maser components at VLSR = 6001 km s-1 was strongly variable with a time scale of a few tens of days, and the variation should be of intrinsic origin. We also showed a possibility of variability of water-vapor maser emission of a megamaser previously detected in a Seyfert/ultraluminous FIR galaxy, NGC 6240.
Description: Restricted Access.
ISSN: 0004-6264
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Copyright: 2005 Astronomical Society of Japan
Appears in Collections:Research Papers (A&A)

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