Measuring Agn Black Hole Masses Through X-ray Variability

Details Measuring Agn Black Hole Masses Through X-ray Variability Measuring Agn Black Hole Masses Through X-ray Variability

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21913507w&link_type=abstract

American Astronomical Society, AAS Meeting #219, #135.07

Astronomy and Astrophysics

Astronomy

Scientific paper

We discuss the method of estimating black hole masses of AGN (including obscured AGN) using X-ray variability. The normalized excess variance of AGN X-ray light curves has been shown to be proportional to the characteristic break frequency in the power spectral density. This break frequency is tightly correlated with the black hole mass and accretion rate. Therefore, this method is potentially suitable for measuring black hole masses in a homogeneous way, including those for which traditional mass estimates from broad-line widths are unavailable and typically inferred from scaling relations. We present a study of several nearby AGN with known black hole masses and power spectral densities as well as simulated light curves with known power spectra in order to determine the limits of applicability of this method.

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