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http://hdl.handle.net/2289/2311
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 Masers 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. |
URI: | http://hdl.handle.net/2289/2311 |
ISSN: | 0004-6264 |
Alternative Location: | http://adsabs.harvard.edu/cgi-bin/bib_query?2005PASJ...57..587S |
Copyright: | 2005 Astronomical Society of Japan |
Appears in Collections: | Research Papers (A&A) |
Files in This Item:
File | Description | Size | Format | |
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2005 PASJ V57 p587-594.pdf Restricted Access | Restricted Access | 366.09 kB | Adobe PDF | View/Open Request a copy |
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