Radiative Properties of Magnetically-Arrested Disks

Abstract

Magnetically-arrested disks (MADs) appear when accretion flows are supplied with a sufficient amount of magnetic flux. In this work, we use results of magnetohydrodynamic simulations to set the configuration of the magnetic field and investigate the dynamics and radiative properties of the resulting accretion flow (i.e., without that of the jet) of MAD. The method developed here is applied to both the MAD and the standard and normal evolution (SANE) accretion flow with or without large scale magnetic fields. For the radiative processes, we include synchrotron, bremsstrahlung and Compton scattering. We find that, in general, MAD accretion flows have similar spectra to those of the SANE, which complicates the task of distinguishing MADs from SANEs. At the same accretion rates, MADs are systematically brighter than SANEs. However, the critical accretion rate above which the hot solution ceases to exist is lower in MAD. Consequently, the maximum luminosity the MAD can reach is comparable but slightly lower than that of SANE, and the dependence on the magnetic flux is weak. We then discuss implications of our results for active galactic nuclei and accreting black-hole binaries.

21 pages, 7 figures, to appear in ApJ

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• The Accretion flow in M87 is really MAD
• Observations of a black hole X-ray binary indicate formation of a magnetically arrested disk
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• The Origin of Matter at the Base of Relativistic Jets in Active Galactic Nuclei
• Possible Evidence of a Universal Radio/X-ray Correlation in a near-Complete Sample of Hard X-ray Selected Seyfert Galaxies
• Observational Constraints on Direct Electron Heating in the Hot Accretion Flows in Sgr A* and M87*
• A comprehensive X-ray view of the active nucleus in NGC 4258
• The year-scale X-ray variations in the core of M87
• The Jet-Disk Coupling of Seyfert Galaxies from a Complete Hard X-ray Sample
• A simple analytical model of magnetic jets
• Constraining X-ray emission of magnetically arrested disk (MAD) by radio-loud AGNs with extreme ultraviolet (EUV) deficit
• Explaining the 'outliers' track in Black Hole X-ray Binaries with the BZ-jet and inner-disk coupling
• Implications of the continuous radio-loudness distribution among AGNs in the local Universe