Clues on jet behavior from simultaneous radio-X-ray fits of GX339-4

Abstract

Understanding the mechanisms of accretion-ejection during X-ray binaries outbursts has been a problem for several decades. It is still not clear yet what controls the spectral evolution of these objects from the hard to the soft states and then back to the hard states at the end of the outburst, tracing the well-known hysteresis cycle in the hardness-intensity diagram. Moreover, the link between the spectral states and the presence/absence of radio emission is still highly debated. In a series of papers, we developed a model composed of a truncated outer standard accretion disk (SAD, from the solution of Shakura and Sunyaev) and an inner jet emitting disk (JED). In this paradigm, the JED plays the role of the hot corona while simultaneously explaining the presence of a radio jet. Our goal is to apply for the first time direct fitting procedures of the JED-SAD model to the hard states of four outbursts of GX 339-4 observed during the 2000-2010 decade by RXTE, combined with simultaneous or quasi simultaneous ATCA observations. We built JED-SAD model tables usable in Xspec as well as a reflection model table based on the Xillver model. We apply our model to the 452 hard state observations obtained with RXTE/PCA. We were able to correctly fit the X-ray spectra and simultaneously reproduce the radio flux. We show that the functional dependency of the radio emission on the model parameters (mainly the accretion rate and the transition radius between the JED and the SAD) is similar between all the rising phases of the different outbursts of GX 339-4. But it is significantly different from the functional dependency obtained in the decaying phases. This result strongly suggests a change in the radiative and/or dynamical properties of the ejection between the beginning and the end of the outburst. We discuss possible scenarios that could explain these differences.

Accepted A&A

References in corpus (15)

• X-ray Properties of Black-Hole Binaries
• Modelling the behaviour of accretion flows in X-ray binaries
• MHD simulations of jet acceleration from Keplerian accretion disks: the effects of disk resistivity
• Properties of AGN coronae in the NuSTAR era II: hybrid plasma
• Initial Measurements of Black Hole Spin in GX 339-4 from Suzaku Spectroscopy
• High Density Reflection Spectroscopy I. A case study of GX~339-4
• Magnetic outflows from turbulent accretion disks: I. Vertical structure & secular evolution
• Evolution of the reverberation lag in GX 339-4 at the end of an outburst
• The role of the disk magnetization on the hysteresis behavior of X-ray binaries
• Magnetically-driven jets and winds from weakly magnetized accretion disks
• A unified accretion-ejection paradigm for black hole X-ray binaries. IV. Replication of the 2010--2011 activity cycle of GX 339-4
• The X-ray binary GX 339-4/V821 Ara: the distance, inclination, evolutionary status and mass transfer
• Accretion and ejection in black-hole X-ray transients
• Radio & X-ray detections of GX 339--4 in quiescence using MeerKAT and Swift
• Magnetic field transport in compact binaries

Cited by in corpus (3)

• A unified accretion-ejection paradigm for black hole X-ray binaries. VI. Radiative efficiency and radio-X-ray correlation during four outbursts from GX339-4
• Do Radio Active Galactic Nuclei Reflect X-ray Binary Spectral States?
• Numerical simulations of MHD jets from Keplerian accretion disks I-Recollimation shocks