Radio / X-ray correlation in the low/hard state of GX 339--4

Abstract

We present the results of a long-term study of the black hole candidate GX 339-4 using simultaneous radio (from the Australia Telescope Compact Array) and X-ray (from the Rossi X-ray Timing Explorer and BeppoSAX) observations performed between 1997 and 2000. We find strong evidence for a correlation between these two emission regimes that extends over more than three decades in X-ray flux, down to the quiescence level of GX 339-4. This is the strongest evidence to date for such strong coupling between radio and X-ray emission. We discuss these results in light of a jet model that can explain the radio/X-ray correlation. This could indicate that a significant fraction of the X-ray flux that is observed in the low-hard state of black hole candidates may be due to optically thin synchrotron emission from the compact jet.

8 pages. Accepted for publication in Astronomy & Astrophysics, 2003

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• Discovery of Jet-Induced Soft Lags of XTE J1550-564 during Its 1998 Outburst
• Galactic X-ray binary jets
• Correlations of Disk and Jet Emission Deviating from the Fundamental Plane
• Identifying Long Radio Transients with Accompanying X-Ray Emission as Disk-Jet Precessing Black Holes: The Case of ASKAP J1832-0911
• A magnetic model for low/hard state of black hole binaries
• The Galactic Black Holes Cyg X-1, GX 339-4, and 4U 1957+11: In Transition and at High Resolution
• Ultraviolet spectroscopy of the black hole X-ray binary MAXI J1820+070 across a state transition
• Accretion Geometry of Black Hole X-ray Binaries: Insights from X-ray Observations
• On the origin of core radio emissions from black hole sources in the realm of relativistic shocked accretion flow
• Probing the Jet Turnover Frequency Dependence on Black Hole Mass and Mass Accretion Rate
• Extreme Transients in Gamma Rays
• A multi-wavelength study of GRS 1716-249 in outburst : constraints on its system parameters
• The black hole X-ray binary MAXI J1348$-$630 in quiescence
• A unified paradigm for the spectral and temporal evolution of Black Hole X-ray Binaries
• Neutrino flares from black hole coronae