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The masses of twenty-eight active galactic nuclei
A statistical analysis of the X-ray time variability and luminosity of28 quasars and Seyfert galaxies is presented. For the case of a thickaccretion disk, the variation of the ratio between total luminosity andEddington luminosity is found. The mass of the central body and the sizeof the emission region are obtained. The dynamical masses based on theH-beta and forbidden O III lines are calculated for comparison. There isgood agreement between the masses derived by the two methods.
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