Reprocessing of X-rays in AGN. I. Plane parallel geometry -- test of pressure equilibrium

Abstract

We present a model of the vertical stratification and the spectra of an irradiated medium under the assumption of constant pressure. Such a solution has properties intermediate between constant density models and hydrostatic equilibrium models, and it may represent a flattened configuration of gas clumps accreting onto the central black hole. Such a medium develops a hot skin, thicker than hydrostatic models, but thinner than constant density models, under comparable irradiation. The range of theoretical values of the alpha_ox index is comparable to those from hydrostatic models and both are close to the observed values for Seyfert galaxies but lower than in quasars. The amount of X-ray Compton reflection is consistent with the observed range. The characteristic property of the model is a frequently multicomponent iron K alpha line.

arXiv commentaccepted for publication in Astronomy and Astrophysics

References in corpus (32)

• ASCA observations of Seyfert 1 galaxies: II. Relativistic Iron K-alpha emission
• The Soft X-Ray Properties of a Complete Sample of Optically Selected Quasars II. Final Results
• Broad iron lines in Active Galactic Nuclei
• A Comprehensive Spectral and Variability Study of Narrow-Line Seyfert 1 Galaxies Observed by ASCA: II. Spectral Analysis and Correlations
• Correlation between Compton reflection and X-ray slope in Seyferts and X-ray binaries
• The variable iron K emission line in MCG-6-30-15
• Thermal Instability and Photoionized X-ray Reflection in Accretion Disks
• Multiwavelength observations of short time-scale variability in NGC 4151. IV. Analysis of multiwavelength continuum variability
• X-ray Reflection By Photoionized Accretion Discs
• Non-LTE Models and Theoretical Spectra of Accretion Disks in Active Galactic Nuclei. IV. Effects of Compton Scattering and Metal Opacities
• Physical Diagnostics from a Narrow Fe-Kalpha Emission Line Detected by Chandra in the Seyfert 1 Galaxy NGC 5548
• Simultaneous EUVE/ASCA/RXTE Observations of NGC 5548
• The properties of the relativistic iron K-line in NGC 3516
• The Origin of the X-ray and Ultraviolet Emission in NGC 7469
• Frequency resolved spectroscopy of Cyg X-1: fast variability of the reflected emission in the soft state
• Relativistic Distortions in the X-ray Spectrum of Cyg X-1
• Variable Iron K-alpha Lines in Seyfert 1 Galaxies
• Intensive HST, RXTE and ASCA Monitoring of NGC 3516: Evidence Against Thermal Reprocessing
• The strength and width of Fe Kalpha lines in Seyferts and their correlations with the X-ray slope
• Reflection and noise in the low spectral state of GX339-4
• First Constraints on Iron Abundance versus Reflection Fraction from the Seyfert~1 Galaxy MCG--6-30-15
• On the lack of X-ray iron line reverberation in MCG-6-30-15: Implications for the black hole mass and accretion disk structure
• X-ray Signatures of an Ionized Reprocessor in the Seyfert galaxy Ton S 180
• The Relationship Between the High Energy Continuum and Emission Lines in QSOs: A Low-Redshift Sample
• The Vertical Structure and Ultraviolet Spectrum of X-Ray Irradiated Accretion Disks in Active Galactic Nuclei
• Observational signatures of X-ray irradiated accretion disks
• Modeling the X-ray - UV Correlations in NGC 3516
• A cloud model of active galactic nuclei: the iron K-alpha line diagnostics
• Iron K-alpha line profiles driven by non-axisymmetric illumination
• A quasi-spherical inner accretion flow in Seyfert galaxies ?
• Modeling the X-ray - UV Correlations in NGC 7469
• Testing a model of variability of X-ray reprocessing features in Active Galactic Nuclei

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• The structure and X-ray radiation spectra of illuminated accretion disks in AGN. III. Modeling fractional variability
• X-ray Reflection from Inhomogeneous Accretion Disks: I. Toy Models and Photon Bubbles
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• Thermal instability in X-ray photoionized media in Active Galactic Nuclei: Influence on the gas structure and spectral features
• Spectral and polarization properties of reflected X-ray emission from black-hole accretion discs for a distant observer: the lamp-post model
• Thermal instability in X-ray photoionized media in Active Galactic Nuclei: II. Role of the thermal conduction in warm absorber
• X-ray He-like ions diagnostics: New Computations for Photoionized Plasmas: I. preliminary considerations
• Response of the warm absorber cloud to a variable nuclear flux in active galactic nuclei