NGC 4151: an intrinsically average Seyfert 1

Abstract

We present a detailed analysis of a long, 100 ksec, observation of NGC 4151 by ASCA, contemporaneous with an observation by the CGRO/OSSE. We fit the data with physical models including an Fe K line and Compton reflection both relativistically broadened and coupled according to theoretical results. The model also includes a narrow Fe K component, which is emitted by both an extended plasma region and the X-ray absorber. Our study of the absorber shows strong evidence for the presence of more than one partial-covering cloud in the line of sight. Taking these points into account, our best intrinsic model includes a Comptonization continuum with an X-ray slope of Gamma=1.9 from a thermal plasma with an electron kT=70 keV or so and a disk line with an equivalent width of about 70 eV. The broadening of the line and reflection indicate their origin from innermost parts of an accretion disk. Our results indicate that NGC 4151 has an intrinsic X-ray spectrum and variability properties similar to those of average Seyfert 1s.

ApJ, in press, 14 pages, some figures in color

References in corpus (2)

• XMM-EPIC observation of MCG-6-30-15: Direct evidence for the extraction of energy from aspinning black hole?
• Chandra X-ray Observation of NGC 4151

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• Swift monitoring of NGC 4151: Evidence for a Second X-ray/UV Reprocessing
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• Comptonization in Super-Eddington Accretion Flow and Growth Timescale of Supermassive Black Holes
• Rapid N_H changes in NGC 4151
• Long-term spectral changes in the partial-covering candidate NLS1 1H 0707-495
• Swift observations of V404 Cyg during the 2015 outburst: X-ray outflows from super-Eddington accretion
• Luminous hot accretion flows: the origin of X-ray emission of Seyfert galaxies and black hole binaries
• The black hole binary V404 Cygni: an obscured AGN analogue
• Extreme flux states of NGC 4151 observed with INTEGRAL
• Iron K features in the hard X-ray XMM-Newton spectrum of NGC 4151
• A Suzaku, NuSTAR, and XMM-Newton view on variable absorption and relativistic reflection in NGC 4151
• Spectral Survey of X-Ray Bright Active Galactic Nuclei from the Rossi X-ray Timing Explorer
• The broad band spectrum and variability of NGC 4151 observed by BeppoSAX
• The High Energy Spectrum of NGC 4151
• First INTEGRAL observations of Cygnus X-3
• The pertinence of Jet Emitting Discs physics to Microquasars: Application to Cygnus X-1
• The origin of emission and absorption features in Ton S180 Chandra observations
• Revisit Short Term X-ray Spectral Variability of NGC 4151 with Chandra
• Energy-dependent variability from accretion flows
• A Single Intrinsic Luminosity Function for Both Type-I and Type-II Active Galactic Nuclei
• The X-ray variability history of Markarian 3
• BeppoSAX/PDS identification of the true counterpart of the Piccinotti source H0917-074
• Rapid N_H Changes in NGC 4151
• The polarized spectral energy distribution of NGC 4151
• Relativistic reflection in NGC 4151
• The hard X-ray view of bright infrared galaxies
• Unveiling cosmic X-ray/gamma-ray sources from their scattering screen