Radiative processes, spectral states and variability of black-hole binaries

Andrzej A. Zdziarski (Lead / Corresponding author), Marek Gierliński

Research output: Contribution to journalReview article

183 Citations (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)99-119
Number of pages21
JournalProgress of Theoretical Physics Supplements
Volume155
DOIs
Publication statusPublished - 1 May 2004

Fingerprint

scattering
synchrotrons
electrons
x rays
hysteresis
radii
photons
energy

Cite this

@article{bb1702fa48984946b62cbe566348965c,
title = "Radiative processes, spectral states and variability of black-hole binaries",
abstract = "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.",
author = "Zdziarski, {Andrzej A.} and Marek Gierliński",
year = "2004",
month = "5",
day = "1",
doi = "10.1143/PTPS.155.99",
language = "English",
volume = "155",
pages = "99--119",
journal = "Progress of Theoretical Physics Supplements",
issn = "0375-9687",
publisher = "Oxford University Press",

}

Radiative processes, spectral states and variability of black-hole binaries. / Zdziarski, Andrzej A. (Lead / Corresponding author); Gierliński, Marek.

In: Progress of Theoretical Physics Supplements, Vol. 155, 01.05.2004, p. 99-119.

Research output: Contribution to journalReview article

TY - JOUR

T1 - Radiative processes, spectral states and variability of black-hole binaries

AU - Zdziarski, Andrzej A.

AU - Gierliński, Marek

PY - 2004/5/1

Y1 - 2004/5/1

N2 - 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.

AB - 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.

UR - http://www.scopus.com/inward/record.url?scp=11044236543&partnerID=8YFLogxK

U2 - 10.1143/PTPS.155.99

DO - 10.1143/PTPS.155.99

M3 - Review article

VL - 155

SP - 99

EP - 119

JO - Progress of Theoretical Physics Supplements

JF - Progress of Theoretical Physics Supplements

SN - 0375-9687

ER -