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Paper: The Scaling of X-ray Variability with Black Hole Mass in AGNs
Volume: 360, AGN Variability from X-Rays to Radio Waves
Page: 97
Authors: Papadakis, I.E.
Abstract: 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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