The intrinsic emission of Seyfert galaxies observed with BeppoSAX/PDS I. Comparison of the average spectra of the three classes of Seyfert Galaxies

Abstract

We present a study of the hard X-ray spectrum (>15 keV) of different classes of Seyfert galaxies observed with BeppoSAX/PDS. Using hard X-ray data, we avoid absorption effects modifying the Seyfert emission and have direct access to the central engine of these sources. The aim of this study is first to characterize the general properties of the hard X-ray spectrum of Seyfert 1, 1.5 and 2 galaxies and secondly to compare their intrinsic emission to test unified models according to which all the classes have the same nucleus. We compute the average spectrum of 14 Sy 1, 9 Sy 1.5 and 22 Sy 2 galaxies observed by the PDS (15-136 keV). The average spectrum of Sy 1 differs from that of Sy 2, the first requiring the presence of a high energy cutoff which is absent in the second. We also show that the reflection component is possibly more important in the Sy 2 emission. The nature of Sy 1.5 galaxies is ambiguous as they have a negligible reflection component (like Sy 1) and do not require a cutoff (like Sy 2)

14 pages, 23 figures

References in corpus (1)

• The intrinsic emission of Seyfert galaxies observed with BeppoSAX/PDS I. Comparison of the average spectra of the three classes of Seyfert Galaxies

Cited by in corpus (32)

• The X-ray Spectral Properties of SCUBA Galaxies
• The Space Density of Compton Thick AGN and the X-ray Background
• Radiatively Inefficient Accretion in Nearby Galaxies
• Multiwavelength campaign on Mrk 509 XII. Broad band spectral analysis
• The Second INTEGRAL AGN Catalogue
• Reflection in Seyfert Galaxies and the Unified Model of AGN
• The First INTEGRAL AGN Catalog
• The NuSTAR Extragalactic Survey: A First Sensitive Look at the High-Energy Cosmic X-ray Background Population
• BAT X-ray Survey - III: X-ray Spectra and Statistical Properties
• The X-ray spectral properties of the AGN population in the XMM-Newton bright serendipitous survey
• Hard X-ray spectra of AGN in the INTEGRAL complete sample
• Suzaku Observation of a Hard Excess in 1H 0419-577: Detection of a Compton-Thick Partial-Covering Absorber
• X-ray power law spectra in active galactic nuclei
• INTEGRAL and XMM-Newton Spectral Studies of NGC 4388
• The broad-band XMM-Newton and INTEGRAL spectra of bright type 1 Seyfert galaxies
• The intrinsic emission of Seyfert galaxies observed with BeppoSAX/PDS I. Comparison of the average spectra of the three classes of Seyfert Galaxies
• INTEGRAL observations of AGN in the Galactic Plane
• Suzaku View of the Swift/Bat Active Galactic Nuclei. IV. Nature of Two Narrow-Line Radio Galaxies (3C 403 and IC 5063)
• INTEGRAL observations of the field of the BL Lacertae object S5~0716+714
• A Chandra observation of the z=2.285 galaxy FSC10214+4724: Evidence for a Compton-thick quasar?
• Evidence for X-ray Obscuration in Type II Quasar Candidates from the Sloan Digital Sky Survey
• Cascades of shocks in Active Galactic Nuclei and their radiation
• The high-ionization IR fine-structure lines as bolometric indicators of the AGN power: study of the complete 12 micron AGN sample
• Comptonization in the vicinity of black hole horizon
• Investigating the central engine of Seyfert 2 galaxies with and without Polarized Broad Lines
• On the Nature of the High-Energy Rollover in 1H 0419-577
• Flare-induced fountains and buried flares in AGN
• X-Ray Spectral Parameters for a Sample of 95 Active Galactic Nuclei
• Investigating the complex X-ray spectrum of a broad-line 2MASS red quasar: XMM-Newton observation of FTM 0830+3759
• Modeling time delays in the X-ray spectrum of the Seyfert galaxy MCG-6-30-15
• Spectral analysis of a large sample of BeppoSAX Seyfert spectra with Comptonization models: Preliminary results
• Restless Quasar Activity: From BeppoSAX to Chandra and XMM-Newton