Multiwavelength observations of the black hole transient Swift J1745-26 during the outburst decay

Abstract

We characterized the broad-band X-ray spectra of Swift J1745-26 during the decay of the 2013 outburst using INTEGRAL ISGRI, JEM-X and Swift XRT. The X-ray evolution is compared to the evolution in optical and radio. We fit the X- ray spectra with phenomenological and Comptonization models. We discuss possible scenarios for the physical origin of a ~50 day flare observed both in optical and X- rays ~170 days after the peak of the outburst. We conclude that it is a result of enhanced mass accretion in response to an earlier heating event. We characterized the evolution in the hard X-ray band and showed that for the joint ISGRI-XRT fits, the e-folding energy decreased from 350 keV to 130 keV, while the energy where the exponential cut-off starts increased from 75 keV to 112 keV as the decay progressed.We investigated the claim that high energy cut-offs disappear with the compact jet turning on during outburst decays, and showed that spectra taken with HEXTE on RXTE provide insufficient quality to characterize cut-offs during the decay for typical hard X-ray fluxes. Long INTEGRAL monitoring observations are required to understand the relation between the compact jet formation and hard X-ray behavior. We found that for the entire decay (including the flare), the X-ray spectra are consistent with thermal Comptonization, but a jet synchrotron origin cannot be ruled out.

arXiv commentAccepted for publication by MNRAS

References in corpus (49)

• On the Absorption of X-rays in the Interstellar Medium
• Atomic Data for Astrophysics. II. New Analytic Fits for Photoionization Cross Sections of Atoms and Ions
• Going with the flow: can the base of jets subsume the role of compact accretion disk coronae?
• Correlated X-ray Spectral and Timing Behavior of the Black Hole Candidate XTE J1550-564: A New Interpretation of Black Hole States
• A jet model for the broadband spectrum of XTE J1118+480: Synchrotron emission from radio to X-rays in the Low/Hard spectral state
• Radiation mechanisms and geometry of Cygnus X-1 in the soft state
• Powerful jets from black hole X-ray binaries in Low/Hard X-ray states
• The Two-Phase Pair Corona Model for Active Galactic Nuclei and X-ray Binaries: How to Obtain Exact Solutions
• The INTEGRAL Science Data Centre (ISDC)
• The "universal" radio/X-ray flux correlation : the case study of the black hole GX 339-4
• Near-infrared synchrotron emission from the compact jet of GX339-4
• The evolution of the high-energy cut-off in the X-Ray spectrum of the GX 339-4 across a hard-to-soft transition
• Corona, Jet, and Relativistic Line Models for Suzaku/RXTE/Chandra-HETG Observations of the Cygnus X-1 Hard State
• Testing the jet quenching paradigm with an ultradeep observation of a steadily soft state black hole
• Hot accretion flow in black hole binaries: a link connecting X-rays to the infrared
• The infrared/X-ray correlation of GX 339-4: Probing hard X-ray emission in accreting black holes
• 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
• Formation of the compact jets in the black hole GX 339-4
• The accretion-ejection coupling in the black hole candidate X-ray binary MAXI J1836-194
• A Swift survey of accretion onto stellar-mass black holes
• Complete Multiwavelength Evolution of Galactic Black Hole Transients During Outburst Decay I: Conditions for "Compact" Jet Formation
• Constraining Jet/Disk Geometry and Radiative Processes in Stellar Black Holes XTE J1118+480 and GX 339-4
• A failed outburst of H1743-322
• Evidence for a compact jet dominating the broadband spectrum of the black hole accretor XTE J1550-564
• "Soft X-ray transient" outbursts which aren't soft
• An evolving compact jet in the black hole X-ray binary MAXI J1836-194
• Multiwavelength Observations of the Black Hole Candidate XTE J1550-564 during the 2000 Outburst
• Optical and Near Infrared Monitoring of the Black-Hole X-ray Binary GX 339-4 During 2002-2010
• The 2002 Outburst of the Black-Hole X-ray Binary 4U 1543-47: Optical and Infrared Light Curves
• The X-ray transient XTE J1859+226 in Outburst & Quiescence
• 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
• 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
• Hard X-ray emission of the microquasar GRO J1655-40 during the rise of its 2005 outburst
• A complex state transition from the black hole candidate Swift J1753.5-0127
• The evolving polarised jet of black hole candidate Swift J1745-26
• Variability and spectral modeling of the hard X-ray emission of GX 339-4 in a bright low/hard state
• Hard X-ray emission of the microquasar GX 339-4 in the low/hard state
• X-ray, Optical and Infrared Observations of GX 339-4 During Its 2011 Decay
• High-energy observations of the state transition of the X-ray nova and black hole candidate XTE J1720-318
• The first outburst of the black hole candidate MAXI J1836-194 observed by INTEGRAL, Swift, and RXTE
• X-ray Emission from Transient Jet Model in Black Hole Binaries
• A late jet rebrightening revealed from multi-wavelength monitoring of the black hole candidate XTE J1752-223
• The optical counterpart of the bright X-ray transient Swift J1745-26
• The high energy emission of GRO J1655-40 as revealed with INTEGRAL spectroscopy of the 2005 outburst
• Multiwavelength observations of the black hole transient XTE J1752-223 during its 2010 outburst decay
• On the Outbursts of Soft X-ray Transients

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• WATCHDOG: A Comprehensive All-Sky Database of Galactic Black Hole X-ray Binaries
• Transient Black Hole Binaries
• Bright mini-outburst ends the 12-year long activity of the black hole candidate Swift J1753.5-0127
• The INTEGRAL view on Black Hole X-ray Binaries
• The radio/X-ray correlation in X-ray binaries - Insights from a hard X-ray perspective
• The long outburst of the black hole transient GRS 1716-249 observed in the X-ray and radio band
• Spectral and timing evolution of the bright failed outburst of the transient black hole Swift J174510.8-262411
• Sub-mm Jet Properties of the X-Ray Binary Swift J1745$-$26
• Physical constraints from near-infrared fast photometry of the black-hole transient GX 339-4
• Multiwavelength observations of MAXI J1820+070 during its outburst decay and subsequent mini-outburst
• Seven reflares, a mini-outburst and an outburst : High amplitude optical variations in the black hole X-ray binary Swift J1910.2-0546
• Broad-band spectral energy distribution of the X-ray transient Swift J1745-26 from outburst to quiescence