Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005pasj...57..587s&link_type=abstract
Publications of the Astronomical Society of Japan, Vol.57, No.4, pp. 587-594
Astronomy and Astrophysics
Astronomy
2
Galaxies: Active, Galaxies: Individual (Ngc 6240, Ngc 6926), Galaxies: Seyfert, Masers, Radio Lines: Galaxies
Scientific paper
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 L&sun;. 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.
Balasubramanyam Ramesh
Hall Peter
Ishihara Yuko
Kuno Nario
Nakai Naomasa
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