Modelling spectral and timing properties of accreting black holes: the hybrid hot flow paradigm

Abstract

The general picture that emerged by the end of 1990s from a large set of optical and X-ray, spectral and timing data was that the X-rays are produced in the innermost hot part of the accretion flow, while the optical/infrared (OIR) emission is mainly produced by the irradiated outer thin accretion disc. Recent multiwavelength observations of Galactic black hole transients show that the situation is not so simple. Fast variability in the OIR band, OIR excesses above the thermal emission and a complicated interplay between the X-ray and the OIR light curves imply that the OIR emitting region is much more compact. One of the popular hypotheses is that the jet contributes to the OIR emission and even is responsible for the bulk of the X-rays. However, this scenario is largely ad hoc and is in contradiction with many previously established facts. Alternatively, the hot accretion flow, known to be consistent with the X-ray spectral and timing data, is also a viable candidate to produce the OIR radiation. The hot-flow scenario naturally explains the power-law like OIR spectra, fast OIR variability and its complex relation to the X-rays if the hot flow contains non-thermal electrons (even in energetically negligible quantities), which are required by the presence of the MeV tail in Cyg X-1. The presence of non-thermal electrons also lowers the equilibrium electron temperature in the hot flow model to <100 keV, making it more consistent with observations. Here we argue that any viable model should simultaneously explain a large set of spectral and timing data and show that the hybrid (thermal/non-thermal) hot flow model satisfies most of the constraints.

26 pages, 13 figures. To be published in the Space Science Reviews and as hard cover in the Space Sciences Series of ISSI - The Physics of Accretion on to Black Holes (Springer Publisher)

References in corpus (25)

• X-ray Properties of Black-Hole Binaries
• Modelling the behaviour of accretion flows in X-ray binaries
• Global General Relativistic MHD Simulation of a Tilted Black-Hole Accretion Disk
• Reprocessing of X-rays in the outer accretion disc of the black hole binary XTE J1817--330
• The hard X-ray spectral evolution in X-ray binaries and its application to constrain the black hole mass of ultraluminous X-ray sources
• Hot accretion flow in black hole binaries: a link connecting X-rays to the infrared
• The synchrotron boiler and the spectral states of black hole binaries
• Complete Multiwavelength Evolution of Galactic Black Hole Transients During Outburst Decay I: Conditions for "Compact" Jet Formation
• The spectral energy distribution of quiescent black hole X-ray binaries: new constraints from Spitzer
• On the origin of spectral states in accreting black holes
• Rapid optical and X-ray timing observations of GX 339-4: flux correlations at the onset of a low/hard state
• A Black Hole Nova Obscured by an Inner Disk Torus
• A unified Lense-Thirring precession model for optical and X-ray quasi-periodic oscillations in black hole binaries
• The soft component and the iron line as signatures of the disc inner radius in Galactic black hole binaries
• Epicyclic Motions and Standing Shocks in Numerically Simulated Tilted Black-Hole Accretion Disks
• Simulating radiation and kinetic processes in relativistic plasmas
• Evolution of the 0.01 - 25 Hz power spectral components in Cygnus X-1
• SWIFT J1753.5-0127: a surprising optical/X-ray cross-correlation function
• Multiwavelength spectral and high time resolution observations of SWIFT J1753.5-0127: new activity?
• Further Evidence for Variable Synchrotron Emission in XTE J1118+480 in Outburst
• Polarised infrared emission from X-ray binary jets
• Dynamical Structure of Viscous Accretion Disks with Shocks
• The first polarimetric signatures of infrared jets in X-ray binaries
• X-ray, Optical and Infrared Observations of GX 339-4 During Its 2011 Decay
• Lithium abundance in atmospheres of F- and G-type supergiants and bright giants

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