Disk-Evaporation Fed Corona: Structure and Evaporation Feature with Magnetic Field

Abstract

The disk-corona evaporation model naturally interprets many observational phenomena in black hole X-ray binaries, such as the truncation of an accretion disk and the spectral state transitions. On the other hand, magnetic field is known to play an important role in transporting angular momentum and producing viscosity in accretion flows. In this work, we explicitly take the magnetic field in the accretion disk corona into account and numerically calculate the coronal structure on the basis of our two-temperature evaporation code. We show that the magnetic field influences the coronal structure by its contribution to the pressure, energy and radiative cooling in the corona and by decreasing the vertical heat conduction. We found that the maximal evaporation rate keeps more or less constant ($\sim 0.03$ Eddington rate) while the strength of magnetic fields changes, but that the radius corresponding to the maximal evaporation rate decreases with increasing magnetic field. This predicts that the spectral state transition always occurs at a few percent of Eddington accretion rate, while the inner edge of thin disk can be at $\sim 100R_{\mathrm{S}}$ or even less in the hard state before the transition to the soft state. These results alleviate the problem that previous evaporation models predict too large a truncation radius, and are in better agreement with the observational results of several black hole X-ray binaries, though discrepancies remain.

Accepted by ApJ

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• The relation between radio and X-ray luminosity of black hole binaries: affected by inner cool disks?
• The Dependence of Spectral State Transition and Disk Truncation on Viscosity Parameter $α
• Disk corona interaction: mechanism for the disk truncation and spectrum change in low luminosity AGN
• Accretion and ejection in black-hole X-ray transients
• Application of the Disk Evaporation Model to AGNs
• The Spectral Features of Disk and Corona with Mass Evaporation in the Low/Hard State
• Revisiting the structure and spectrum of the magnetic-reconnection-heated corona in luminous AGNs
• The disk evaporation model for the spectral features of low-luminosity active galactic nuclei
• The Structure and Spectral Features of a Thin Disk and Evaporation-Fed Corona in High-Luminosity AGNs
• Hard and soft spectral states of ULXs
• Analytical Model of Disk Evaporation and State Transitions in Accreting Black Holes
• Constraints on the Viscosity and Magnetic Field in Hot Accretion Flows around Black Holes
• The Large Amplitude X-ray Variability in NGC 7589: Possible Evidence for Accretion Mode Transition
• Tilted Accretion Disks
• Investigating disc-corona interaction in axisymmetric accretion disc models