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Radiative Processes, Spectral States and Variability of Black-Hole Binaries

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arxiv astro-ph/0403683 v3 pith:EWYKZPW5 submitted 2004-03-30 astro-ph

Radiative Processes, Spectral States and Variability of Black-Hole Binaries

Andrzej A. Zdziarski (N. Copernicus Center , Warsaw , Poland) , Marek Gierlinski (University of Durham , UK) This is my paper
classification astro-ph
keywords diskaccretionbinariescoldemissionstatesblack-holeblackbody
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We review radiative processes responsible for X-ray emission in hard (low) and soft (high) spectral states of black-hole binaries. The main process in the hard state appears to be scattering of blackbody photons from a cold disk by thermal electrons in a hot inner flow, and any contribution from nonthermal synchrotron emission is at most small. In the soft states, blackbody disk emission dominates energetically, and its high-energy tail is due to scattering by hybrid, thermal/nonthermal electrons, probably in active regions above the disk surface. State transitions appear to correspond to a variable inner radius of the cold disk driven by changes of the accretion rate. The existence of two accretion solutions, hot and cold, in a range of the accretion rate leads to hysteresis in low-mass X-ray binaries.

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Cited by 3 Pith papers

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  1. Unchanged X-Ray Polarization During Accretion Dips in the Low Hard State of Cygnus X-1

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    During Cygnus X-1 accretion dips the 2–8 keV polarization is unchanged within errors, indicating the absorbed disk does not contribute and supporting an extended oblate corona.

  2. Radio-X-ray Time Lags in GX 339-4: Probing Magnetic Field Transport in Black Hole Accretion

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    Time lag analysis using ICCF on GX 339-4 data reveals state-dependent radio-X-ray delays interpreted as evidence for magnetic field transport linking the inner accretion flow and jet.

  3. Radio-X-ray Time Lags in GX 339-4: Probing Magnetic Field Transport in Black Hole Accretion

    astro-ph.HE 2026-05 unverdicted novelty 4.0

    Radio precedes X-ray Compton luminosity by ~3 days in the rising hard state but lags by ~8 days in the decaying hard state of GX 339-4, with inner magnetic field strength estimated from accretion rate and truncation r...