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Short time-scale AGN X-ray variability with EXOSAT: black hole mass and normalized variability amplitude.

McHardy, I. M.

The old EXOSAT medium energy measurements of high-frequency (HF) active galactic nuclei (AGN) power spectral normalization are re-examined in the light of accurate black hole mass determinations which were not available when these data were first published by Green et al. It is found that the normalized variability amplitude (NVA), measured direct…