Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21110807t&link_type=abstract
American Astronomical Society, AAS Meeting #211, #108.07; Bulletin of the American Astronomical Society, Vol. 39, p.937
Astronomy and Astrophysics
Astronomy
Scientific paper
H2O maser emission seems to preferentially occur in highly obscured AGN. Using archival and new XMM data we have expanded to 18 the sample of AGN with maser emission believed to originate in accretion disk material and with estimated column densities. Approximately 75% have obscuring column densities in excess of 1E24 /cm2. We have also preliminarily identified a correlation between central engine 2-10 keV luminosity (L) and the inner radius (R) of H2O maser emission in the accretion disks of 8 AGN (R L0.5+/-0.06. This may be direct confirmation (for Type-2 AGN) that irradiation dominates disk heating at radii of 0.1-1 pc for masses ranging from 2E6 to 3E7 solar masses. Scatter in the relation reduces significantly if the radius and luminosity are scaled by the mass enclosed within the inner radius of the disk, inferred from VLBI maser observations. This may be due to increased importance of shear viscosity in the accretion disk at smaller radii (in gravitational units).
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