A disc corona-jet model for the radio/X-ray correlation in black hole X-ray binaries

Abstract

The observed tight radio/X-ray correlation in the low spectral state of some black hole X-ray binaries implies the strong coupling of the accretion and jet. The correlation of $L_{\mathrm{R}}\propto L_{\mathrm{X}}^{\sim 0.5-0.7}$ was well explained by the coupling of a radiatively inefficient accretion flow and a jet. Recently, however, a growing number of sources show more complicated radio/X-ray correlations, e.g., $L_{\mathrm{R}}\propto L_{\mathrm{X}}^{\sim 1.4}$ for $L_{\mathrm{X}}/L_{\mathrm{Edd}}\gtrsim 10^{-3}$, which is suggested to be explained by the coupling of a radiatively efficient accretion flow and a jet. In this work, we interpret the deviation from the initial radio/X-ray correlation for $L_{\mathrm{X}}/L_{\mathrm{Edd}}\gtrsim 10^{-3}$ with a detailed disc corona-jet model. In this model, the disc and corona are radiatively and dynamically coupled. Assuming a fraction of the matter in the accretion flow, $\eta \equiv {\dot{M}}_{\mathrm{jet}}/\dot{M}$, is ejected to form the jet, we can calculate the emergent spectrum of the disc corona-jet system. We calculate $L_{\mathrm{R}}$ and $L_{\mathrm{X}}$ at different $\dot{M}$, adjusting $\eta$ to fit the observed radio/X-ray correlation of the black hole X-ray transient H1743-322 for $L_{\mathrm{X}}/L_{\mathrm{Edd}}>10^{-3}$. It is found that always the X-ray emission is dominated by the disc corona and the radio emission is dominated by the jet. We noted that the value of $\eta$ for the deviated radio/X-ray correlation for $L_{\mathrm{X}}/L_{\mathrm{Edd}}>10^{-3}$, is systematically less than that of the case for $L_{\mathrm{X}}/L_{\mathrm{Edd}}<10^{-3}$, which is consistent with the general idea that the jet is often relatively suppressed at the high luminosity phase in black hole X-ray binaries.

Accepted by MNRAS

References in corpus (15)

• X-ray Properties of Black-Hole Binaries
• Accretion disc viscosity: how big is alpha?
• Advection-Dominated Accretion and the Black Hole Event Horizon
• A Long, Hard Look at the Low-Hard State in Accreting Black Holes
• A radio-emitting outflow in the quiescent state of A0620-00: implications for modelling low-luminosity black hole binaries
• The 2003 Outburst of the X-ray Transient H 1743-322: Comparisons with the Black Hole Microquasar XTE J1550-564
• The hard X-ray spectral evolution in X-ray binaries and its application to constrain the black hole mass of ultraluminous X-ray sources
• A Prominent Accretion Disk in the Low-Hard State of the Black Hole Candidate SWIFT J1753.5-0127
• Revisiting the radio/X-ray flux correlation in the black hole V404 Cyg: from outburst to quiescence
• An accretion disc-corona model for X-ray spectra of active galactic nuclei
• Broadband X-ray Spectra of GX 339-4 and the Geometry of Accreting Black Holes in the Hard State
• A Model for Emission from Jets in X-ray Binaries: Consequences of a Single Acceleration Episode
• On the Radio/X-ray Correlation in Microquasars
• Origin of X-ray Emission from Transient Black Hole Candidates in Quiescence
• Jet-dominated quiescent states in black hole X-ray binaries: the case of V404 Cyg

Cited by in corpus (9)

• Fundamental Plane of Black Hole Activity in Quiescent Regime
• Magnetic-reconnection-heated corona in active galactic nuclei: refined disc-corona model and application to broad-band radiation
• Revisiting the structure and spectrum of the magnetic-reconnection-heated corona in luminous AGNs
• A luminous hot accretion flow in the low-luminosity active galactic nucleus NGC 7213
• The X-ray emission in young radio AGNs
• Observational Signatures of Mass-Loading in Jets Launched by Rotating Black Holes
• A model for the radio/X-ray correlation in three neutron star low-mass X-ray binaries 4U 1728-34, Aql X-1 and EXO 1745-248
• The Jet-Disk Coupling of Seyfert Galaxies from a Complete Hard X-ray Sample
• Effects of Spin on High-Energy Radiation from Accreting Black Holes