The Scaling of X-ray Variability with Black Hole Mass in AGNs

Details The Scaling of X-ray Variability with Black Hole Mass in AGNs The Scaling of X-ray Variability with Black Hole Mass in AGNs

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..360...97p&link_type=abstract

AGN Variability from X-Rays to Radio Waves ASP Conference Series, Vol. 360, Proceedings of the conference held 14-16 June, 2004

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There exists a significant correlation between the 2-10 keV, excess variance (measured on both long and short time scales) and the black hole mass in AGNs. This relation is consistent with the assumption that the 2-10 keV power spectrum in these objects has a ``universal" shape. It has a slope of -1 up to a break frequency (which decreases with increasing black hole mass) while it steepens to a slope of -2 at higher frequencies. Based on this result, the excess variance measurements can be used to provide black hole mass estimates for AGNs which are consistent with values obtained using other methods.

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