The First Hard X-Ray Power Spectral Density Functions of AGN
  We present results of our Power Spectral Density (PSD) analysis of 30 AGN
using the 58 month light curves from Swift's Burst Alert Telescope (BAT) in the
14-150 keV band. PSDs were fit using a Monte Carlo based algorithm to take into
account windowing effects and measurement error. All but one source were found
to be fit very well using an unbroken power law with a slope of ~-1, consistent
at low frequencies with previous studies in the 2-10 keV band, with no evidence
of a break in the PSD. For 5 of the highest S/N sources we tested the energy
dependence of the PSD and found no significant difference in the PSD at
different energies. Unlike previous studies of X-ray variability in AGN, we do
not find any significant correlations between the hard X-ray variability and
different properties of the AGN including luminosity and black hole mass. The
lack of break frequencies and correlations seem to indicate that AGN are
similar to the high state of Galactic Black Holes.
