Detection of Water Maser Flare in the Seyfert/LINER, NGC 6240

Details Detection of Water Maser Flare in the Seyfert/LINER, NGC 6240 Detection of Water Maser Flare in the Seyfert/LINER, NGC 6240

Apr 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pasj...54l..27n&link_type=abstract

Publications of the Astronomical Society of Japan, Vol.54, No.2, pp.L27-L30

Astronomy and Astrophysics

Astronomy

13

Galaxies: Active, Galaxies: Individual (Ngc 6240), Galaxies: Nuclei, Masers

Scientific paper

We report on a flare-up of water-vapor maser emission in a prototypical ultraluminous FIR galaxy with an AGN, NGC6240. The flux density of the detected maser line was ≈ 0.1 Jy with FWHM ≈ 5 km s-1, indicating an apparent isotropic luminosity of ≈ 100 Lsolar at a distance of 100 Mpc, which is typical for water megamasers. The maser line was redshifted by ≈ 200 km s-1 relative to the systemic velocity of the galaxy, while no systemic-velocity feature was detected. The previous possible detection or observed upper limits were at a level lower than the flux density in the present paper, indicating that the water maser in NGC6240 flared up by more than a factor of 5 in 2001.

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