The First Hard X-Ray Power Spectral Density Functions of AGN

Abstract

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.

24 pages, 18 figures, 7 tables, accepted for publication in ApJ

References in corpus (20)

• Three years Swift-BAT Survey of AGN: reconciling theory and observations?
• X-ray variability of 104 active galactic nuclei. XMM-Newton power-spectrum density profiles
• Discovery of multiple Lorentzian components in the X-ray timing properties of the Narrow Line Seyfert 1 Ark 564
• A Stochastic Model for the Luminosity Fluctuations of Accreting Black Holes
• The central parsecs of Centaurus A: High Excitation Gas, a Molecular Disk, and the Mass of the Black Hole
• The mass of the black hole in Centaurus A from SINFONI AO-assisted integral-field observations of stellar kinematics
• The Swift BAT-detected Seyfert 1 Galaxies: X-ray Broadband Properties and Warm Absorbers
• XMM-Newton observations of the Lockman Hole V: time variability of the brightest AGN
• The 60-month all-sky BAT Survey of AGN and the Anisotropy of Nearby AGN
• Synoptic studies of seventeen blazars detected in very high-energy gamma-rays
• The Energy-dependent X-ray Timing Characteristics of the Narrow Line Seyfert 1 Mkn 766
• Twelve and a Half Years of Observations of Centaurus A with RXTE
• Spectral Survey of X-Ray Bright Active Galactic Nuclei from the Rossi X-ray Timing Explorer
• Integral-field spectroscopy of Centaurus A nucleus
• Timing evidence in determining the accretion state of the Seyfert galaxy NGC 3783
• The Lack of Diffuse, Nonthermal Hard X-ray Emission in the Coma Cluster: The Swift BAT's Eye View
• Hard X-ray spectral variability of the brightest Seyfert AGN in the Swift/BAT sample
• The X-ray Power Spectral Density Function of the Seyfert Active Galactic Nucleus NGC 7469
• The longest timescale X-ray variability reveals an evidence for active galactic nuclei in the high accretion state
• The physical origin of the X-ray power spectral density break timescale in accreting black holes

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• The X-ray variability of AGN: power-spectrum and variance analysis of the Swift/BAT light curves
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