X-ray Emissions from Three-dimensional Magnetohydrodynamic Coronal Accretion Flows

Abstract

We calculate the radiation spectrum and its time variability of the black hole accretion disk-corona system based on the three-dimensional magnetohydrodynamic simulation. In explaining the spectral properties of active galactic nuclei (AGNs), it is often assumed that they consist of a geometrically thin, optically thick disk and hot, optically thin corona surrounding the thin disk. As for a model of the corona, we adopt the simulation data of three-dimensional, non-radiative MHD accretion flows calculated by Kato and coworkers, while for a thin disk we assume a standard type disk. We perform Monte Carlo radiative transfer simulations in the corona, taking into account the Compton scattering of soft photons from the thin disk by hot thermal electrons and coronal irradiation heating of the thin disk, which emits blackbody radiation. By adjusting the density parameter of the MHD coronal flow, we can produce the emergent spectra which are consistent with those of typical Seyfert galaxies. Moreover, we find rapid time variability in X-ray emission spectra, originating from the density fluctuation produced by the magnetorotational instability in the MHD corona. The features of reflection component including iron fluorescent line emission are also briefly discussed.

accepted to Publications of the Astronomical Society of Japan

References in corpus (10)

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Cited by in corpus (14)

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• X-ray Spectra from MHD Simulations of Accreting Black Holes
• Some things special about NEAs: Geometric and environmental effects on the optical signatures of hydration
• New Method for Exploring Super-Eddington AGNs by Near-infrared Observations
• The Structure and Spectral Features of a Thin Disk and Evaporation-Fed Corona in High-Luminosity AGNs
• Gamma-ray and Neutrino Signals from Accretion Disk Coronae of Active Galactic Nuclei
• Radiative Spectra from Disk Corona and Inner Hot Flow in Black Hole X-ray Binaries
• Modeling the time-resolved quasi-periodic oscillations in AGNs
• Magnetohydrodynamic Winds Driven by the Line Force from the Standard Thin Disk around Supermassive Black Holes. I. The Case of Weak Magnetic Field
• RAIKOU: A General Relativistic, Multi-wavelength Radiative Transfer Code
• Anisotropic radiation from accretion disc-coronae in active galactic nuclei
• The influence of outflows on the 1/f-like luminosity fluctuations