Statistical Comparisons of H20 Megamaser Galaxies and Type 2 Active Galaxies

Details Statistical Comparisons of H20 Megamaser Galaxies and Type 2 Active Galaxies Statistical Comparisons of H20 Megamaser Galaxies and Type 2 Active Galaxies

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20717606g&link_type=abstract

American Astronomical Society Meeting 207, #176.06; Bulletin of the American Astronomical Society, Vol. 37, p.1449

Astronomy and Astrophysics

Astronomy

Scientific paper

Luminous water maser emission has been detected so far in more than 66 galaxies beyond the LMC, mainly in type 2 active galaxies. The masers provide important information about the shape, orientation, and kinematics of gas in AGN accretion disks. In order to investigate the maser-host connection and to help guide future maser surveys, we performed a statistical comparison of host galaxy properties between galaxies detected in water maser emission and samples of Type 2 Active Galaxies undetected in maser emission. Among the properties examined were the B magnitude, Hubble type, and galactic disk inclination. We also examined near- and far-infrared flux and power, as well as nuclear 2-10 keV luminosity and hard X-ray absorbing column density. In general megamasers prefer AGN with large (log NH > 22 cm-2) X-ray column densities, but the NH distribution of maser-detected and maser-undetected galaxies among Seyfert 2's specifically is similar. The other properties examined are also similar between maser detected and undetected Seyfert 2 galaxies. Our results suggest that luminous water masers may be present in many Seyfert 2 galaxies and our ability to detect them depends largely on the geometry of the nuclear region of the galaxy.
The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc.

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