Other
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...193.5702g&link_type=abstract
American Astronomical Society, 193rd AAS Meeting, #57.02; Bulletin of the American Astronomical Society, Vol. 30, p.1332
Other
5
Scientific paper
The Circinus galaxy is a luminous Seyfert 2 object within which the central engine is heavily obscured, so much so that even hard X-ray emission (2-10 keV) is blocked. However, the large column of dust and gas does not attenuate centimeter wavelength radiation, and it is notable that this AGN is a source of strong water maser emission. We have used the Long Baseline Array of the Australia Telescope, to map the distribution of maser emission at two epochs separated by 1 month. The data resolve the emission with resolutions of about 1 km/s and 0.02 pc. The masers trace a thin accretion disk about 0.8 pc in radius that is bound by a massive central object, in accord with expectations shaped by the current AGN paradigm. However, there is also a significant population of masers that lie away from the disk, possibly in an outflow. A comparison of the images from the two epochs suggests that these masers vary significantly on time scales of 1 month, more rapidly than the masers in the disk. The preponderance of outflow-borne masers sets Circinus apart from the other established cases of water masers in accretion disks, i.e., NGC4258, NGC1068, and NGC4945.
Booth Roy S.
Ellingsen Simon P.
Greenhill Lincoln J.
Herrnstein James Rezso
Moran James Michael
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