Hard X-ray emission of the microquasar GX 339-4 in the low/hard state

Abstract

We present the analysis of the high energy emission of the Galactic black hole binary GX 339-4 in a low/hard state at the beginning of its 2004 outburst. The data from 273 ks of INTEGRAL observations, spread over 4 weeks, are analyzed, along with the existing simultaneous RXTE HEXTE and PCA data. During this period, the flux increases by a factor of about 3, while the spectral shape is quite unchanged, at least up to 150 keV. The high energy data allows us to detect the presence of a high energy cut-off, generally related to thermal mechanisms, and to estimate the plasma parameters in the framework of the Comptonization models. We found an electron temperature of 60-70 keV, an optical depth around 2.5, with a rather low reflection factor (0.2-0.4). In the last observation, we detected a high energy excess above 200 keV with respect to thermal Comptonization while at lower energy, the spectrum is practically identical to the previous one, taken just 2 days before. This suggests that the low and high energy components have a different origin.

arXiv comment12 pages, 6 figures, accepted for publication in ApJ

References in corpus (32)

• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• The evolution of the timing properties of the black-hole transient GX 339-4 during its 2002/2003 outburst
• The Two-Phase Pair Corona Model for Active Galactic Nuclei and X-ray Binaries: How to Obtain Exact Solutions
• In-flight Performance of the High Energy X-ray Timing Experiment on the Rossi X-ray Timing Explorer
• Correlation between Compton reflection and X-ray slope in Seyferts and X-ray binaries
• GX 339-4: the distance, state transitions, hysteresis and spectral correlations
• Simultaneous X-ray and gamma-ray observations of Cyg X-1 in the hard state by Ginga and OSSE
• A Long, Hard Look at the Low-Hard State in Accreting Black Holes
• Near-infrared synchrotron emission from the compact jet of GX339-4
• Dynamical Evidence for a Black Hole in GX 339-4
• Exploring the Role of Jets in the Radio/X-ray Correlations of GX339-4
• Correlations between X-ray and radio spectral properties of accreting black holes
• Multi-wavelength observations of the 2002 outburst of GX 339-4: two patterns of X-ray-optical/near-infrared behavior
• Chandra/HETGS Spectroscopy of the Galactic Black Hole GX 339-4: A Relativistic Iron Line and Evidence for a Seyfert-like Warm Absorber
• SPI/INTEGRAL in-flight performance
• Evidence for Black Hole Spin in GX 339-4: XMM-Newton EPIC-pn and RXTE Spectroscopy of the Very High State
• Complete and Simultaneous Spectral Observations of the Black-Hole X-ray Nova XTE J1118+480
• Coronal--Temporal Correlations in GX339-4: Hysteresis, Possible Reflection Changes, and Implications for ADAFs
• Multiwavelength observations revealing the evolution of the outburst of the black hole XTE J1118+480
• INTEGRAL/RossiXTE high-energy observation of a state transition of GX 339-4
• A High Sensitivity Measurement of the MeV Gamma-Ray Spectrum of Cygnus X-1
• Multi-wavelength observations of the Galactic black hole transient 4U1543-47 during outburst decay: state transitions and jet contribution
• The broad-band spectrum of Cygnus X-1 measured by INTEGRAL
• X-ray and gamma-ray spectra and variability of the black-hole candidate GX 339-4
• X-Ray Observations of XTE J1550-564 During the Decay of the 2000 Outburst - I. Chandra and RXTE Energy Spectra
• Reflection and noise in the low spectral state of GX339-4
• Bimodal spectral variability of Cygnus X-1 in an intermediate state
• The Galactic black hole transient H1743-322 during outburst decay: connections between timing noise, state transitions and radio emission
• VLT optical observations of V821 Ara(=GX339-4) in an extended "off" state
• INTEGRAL and XMM-Newton observations of the X-ray pulsar IGR J16320-4751/AX J1631.9-4752
• State transition and flaring activity of IGR J17464-3213/H1743-322 with SPI/INTEGRAL telescope
• Long-term X-ray variability and state transition of GX 339-4

Cited by in corpus (29)

• The infrared/X-ray correlation of GX 339-4: Probing hard X-ray emission in accreting black holes
• The synchrotron boiler and the spectral states of black hole binaries
• Rapid optical and X-ray timing observations of GX 339-4: flux correlations at the onset of a low/hard state
• Correlated optical, X-ray, and gamma-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni
• Evidence for a change in the X-ray radiation mechanism in the hard state of Galactic black holes
• The magnetic field in the X-ray corona of Cygnus X-1
• Spectral variability of GX 339-4 in a hard-to-soft state transition
• Luminosity dependence of the electron temperature in the bright hard state of the black hole candidate GX 339--4
• Variability and spectral modeling of the hard X-ray emission of GX 339-4 in a bright low/hard state
• The return to the hard state of GX 339-4 as seen by Suzaku
• A timing study of MAXI J1820+070 based on Swift/XRT and NICER monitoring in 2018/19
• An intense state of hard X-ray emission of Cyg X-1 observed by INTEGRAL coincident with TeV measurements
• Unveiling the high energy tail of 1E 1740.7-2942 with INTEGRAL
• The INTEGRAL view on Black Hole X-ray Binaries
• Revealing the nature of the QPO and its harmonic in GX 339-4 using frequency-resolved spectroscopy
• The pertinence of Jet Emitting Discs physics to Microquasars: Application to Cygnus X-1
• Hard X-ray variability of V404 Cyg during the 2015 outburst
• Spectral and timing evolution of the bright failed outburst of the transient black hole Swift J174510.8-262411
• The Galactic LMXB Population and the Galactic Centre Region
• X-ray spectral state evolution in IGR J17091-3624 and comparison of its heartbeat oscillation properties with those of GRS 1915+105
• The high energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst
• INTEGRAL and XMM-Newton Spectroscopy of GX 339-4 During Hard/Soft Intermediate and High/Soft States in the 2007 Outburst
• Correlating spectral and timing properties in the evolving jet of the micro blazar MAXI J1836-194
• The Accreting Black Hole Swift J1753.5-0127 from Radio to Hard X-Ray
• Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay
• INTEGRAL discovery of a high-energy tail in the microquasar Cygnus X-3
• Soft gamma-ray sources detected by INTEGRAL
• Spectral components in black hole X-ray binaries
• High-energy observations of black hole binaries with the INTEGRAL satellite