X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state

Abstract

The power-law emission and reflection component provide valuable insights into the accretion process around a black hole. In this work, thanks to the broadband spectra coverage of \emph{the Nuclear Spectroscopic Telescope Array}, we study the spectral properties for a sample of low-mass black hole X-ray binaries (BHXRBs). We find that there is a positive correlation between the photon index $\Gamma$ and the reflection fraction $R$ (the ratio of the coronal intensity that illuminates the disk to the coronal intensity that reaches the observer), consistent with previous studies, but except for MAXI J1820+070. It is quite interesting that this source also deviates from the well-known ``V"-shaped correlation between the photon index $\Gamma$ and the X-ray luminosity log$L_{\mathrm{X}}$, when it is in the bright hard state. More specifically, the $\Lambda$-shaped correlation between $\Gamma$ and log$L_{\mathrm{X}}$ is observed, as the luminosity decreases by a factor of 3 in a narrow range from $\sim 10^{38}$ to $10^{37.5}$ $\mathrm{erg}{\mathrm{s}}^{-1}$. Furthermore, we discover a strong positive correlation between $R$ and the X-ray luminosity for BHXRBs in the hard state, which puts a constraint on the disk-corona coupling and the evolution.

arXiv comment18 pages, 9 figures, 3 tables, Accepted for publication in ApJ

References in corpus (93)

• emcee: The MCMC Hammer
• On the Absorption of X-rays in the Interstellar Medium
• The Nuclear Spectroscopic Telescope Array (NuSTAR) Mission
• Hot Accretion Flows Around Black Holes
• Some Aspects of Measurement Error in Linear Regression of Astronomical Data
• Advection-Dominated Accretion and the Spectral States of Black Hole X-Ray Binaries: Application to Nova Muscae 1991
• Modelling the behaviour of accretion flows in X-ray binaries
• Broad-band gamma-ray and X-ray spectra of NGC 4151 and their implications for physical processes and geometry
• Improved Reflection Models of Black-Hole Accretion Disks: Treating the Angular Distribution of X-rays
• Constraining Black Hole Spin Via X-ray Spectroscopy
• X-ray reflected spectra from accretion disk models. III. A complete grid of ionized reflection calculations
• Ubiquitous equatorial accretion disc winds in black hole soft states
• Plasma Ejection from Magnetic Flares and the X-ray Spectrum of Cygnus X-1
• The role of the reflection fraction in constraining black hole spin
• Correlation between Compton reflection and X-ray slope in Seyferts and X-ray binaries
• The corona contracts in a black-hole transient
• A Parallax Distance to the Microquasar GRS 1915+105 and a Revised Estimate of its Black Hole Mass
• A quasi-periodic modulation of the iron line centroid energy in the black hole binary H 1743-322
• The Three Spectral Regimes Found in the Stellar Black Hole XTE J1550--564 in its High/Soft State
• Normalizing a Relativistic Model of X-ray Reflection: The Definition of the Reflection Fraction and its Implementation in relxill
• X-ray Reflection Spectroscopy of the Black Hole GX 339-4: Exploring the Hard State with Unprecedented Sensitivity
• The Distance, Inclination, and Spin of the Black Hole Microquasar H1743-322
• Testing the Kerr black hole hypothesis using X-ray reflection spectroscopy
• NuSTAR Spectroscopy of GRS 1915+105: Disk Reflection, Spin, and Connections to Jets
• Correlation between the photon index and X-ray luminosity of black hole X-ray binaries and active galactic nuclei: observations and interpretation
• 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 radio parallax to the black hole X-ray binary MAXI J1820+070
• Gaia DR2 Distances and Peculiar Velocities for Galactic Black Hole Transients
• The binary mass ratio in the black hole transient MAXI J1820+070
• The mass function of GX 339-4 from spectroscopic observations of its donor star
• MAXI J1820+070 with NuSTAR I. An increase in variability frequency but a stable reflection spectrum: coronal properties and implications for the inner disc in black hole binaries
• The complex accretion geometry of GX 339-4 as seen by NuSTAR and Swift
• The truncated and evolving inner accretion disc of the black hole GX 339-4
• Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR During its Summer 2015 Outburst
• Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070
• High Density Reflection Spectroscopy I. A case study of GX~339-4
• Inclination and relativistic effects in the outburst evolution of black hole transients
• Revealing accretion onto black holes: X-ray reflection throughout three outbursts of GX 339-4
• Doughnut strikes sandwich: the geometry of hot medium in accreting black hole X-ray binaries
• Determination of mass of IGR J17091-3624 from "Spectro-Temporal" variations during onset-phase of the 2011 outburst
• Reflection Spectra of the Black Hole Binary Candidate MAXI J1535-571 in the Hard State Observed by NuSTAR
• Accretion Geometry in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• The evolution of GX 339-4 in the low-hard state as seen by NuSTAR and Swift
• New Constraints on the Black Hole Low/Hard State Inner Accretion Flow with NuSTAR
• Reflection and noise in the low spectral state of GX339-4
• Evolution of the reverberation lag in GX 339-4 at the end of an outburst
• Spectroscopic evidence for a low-mass black hole in SWIFT J1753.5-0127
• The obscured X-ray binaries V404 Cyg, Cyg X-3, V4641 Sgr, and GRS 1915+105
• Testing General Relativity with NuSTAR data of Galactic Black Holes
• The X-ray binary GX 339-4/V821 Ara: the distance, inclination, evolutionary status and mass transfer
• On Estimating the High-Energy Cutoff in the X-ray Spectra of Black Holes via Reflection Spectroscopy
• Reflection Modeling of the Black Hole Binary 4U~1630$-$47: the Disk Density and Returning Radiation
• A Physical Model for the Spectral-Timing Properties of Accreting Black Holes
• A New Spin on an Old Black Hole: NuSTAR Spectroscopy of EXO 1846-031
• The 2017 Failed Outburst of GX 339-4: Relativistic X-ray Reflection near the Black Hole Revealed by NuSTAR and Swift Spectroscopy
• A study of the strong gravity region of the black hole in GS 1354-645
• Measuring the distance to the black hole candidate X-ray binary MAXI J1348-630 using HI absorption
• Black hole spin-orbit misalignment in the X-ray binary MAXI J1820+070
• Tests of the Kerr hypothesis with GRS 1915+105 using different RELXILL flavors
• An HI absorption distance to the black hole candidate X-ray binary MAXI J1535-571
• A general relativistic model of accretion disks with coronae surrounding Kerr black holes
• Relativistic reflection and reverberation in GX 339-4 with NICER and NuSTAR
• NuSTAR Observations of the Black Hole GS 1354-645: Evidence of Rapid Black Hole Spin
• The Emission from Inner Disk and Corona in the Low and Intermediate Spectral States of Black Hole X-ray Binaries
• Evolution of the accretion disk-corona during bright hard-to-soft state transition: A reflection spectroscopic study with GX 339-4
• Detection of X-ray spectral state transitions in mini-outbursts of black hole transient GRS 1739-278
• The evolution of the broadband temporal features observed in the black-hole transient MAXI J1820+070 with Insight-HXMT
• A low-luminosity soft state in the short period black hole X-ray binary Swift J1753.5-0127
• Detailed analysis on the reflection component for the black hole candidate MAXI J1348-630
• Hybrid Comptonization and Electron-Positron Pair Production in the Black-Hole X-Ray Binary MAXI J1820+070
• NuSTAR monitoring of MAXI J1348-630: evidence of high density disc reflection
• Stronger Reflection from Black Hole Accretion Disks in Soft X-ray States
• Insight-HXMT, NuSTAR and INTEGRAL Data Show Disk Truncation in the Hard State of the Black-Hole X-Ray Binary MAXI J1820+070
• Coronal properties of black hole X-ray binaries in the hard state as seen by NuSTAR and Swift
• NuSTAR hard X-ray spectra of radio galaxies
• No evidence for a low-mass black hole in Swift J1753.5-0127
• About the Kerr nature of the stellar-mass black hole in GRS 1915+105
• Exploring the radial disc ionization profile of the black hole X-ray binary GRS 1915+105
• NuSTAR view of Swift/BAT AGN: The $R$-$\Gamma$ correlation
• Spectral and Timing Properties of IGR J17091-3624 in the Rising Hard State During its 2016 Outburst
• The condensation of the corona for the correlation between the hard X-ray photon index $\Gamma$ and the reflection scaling factor $\Re$ in active galactic nuclei
• A NuSTAR View of GRS 1716$-$249 in the Hard and Intermediate States
• Correlation between relativistic reflection fraction and photon index in NuSTAR sample of Seyfert 1 AGN
• GRS 1739-278 observed at very low luminosity with XMM-Newton and NuSTAR
• The black hole X-ray transient Swift J1357.2-0933 as seen with Swift and NuSTAR during its 2017 outburst
• Accretion Scenario of MAXI J1820+070 during 2018 Outbursts with Multi-mission Observations
• Analysis of the reflection spectra of MAXI J1535-571 in the hard and intermediate states
• Re-awakening of GRS 1716--249 after 23 years, observed by {\it Swift}/XRT and {\it NuSTAR}
• Accretion Properties of MAXI J1813-095 during its Failed Outburst in 2018
• 2016 outburst of H~1743--322: \textit{XMM-Newton} and \textit{NuSTAR} view
• Constraining X-ray reflection in the low-luminosity AGN NGC 3718 using NuSTAR and XMM--Newton
• A NuSTAR and Swift View of the Hard State of MAXI J1813-095
• Lamp-post with an outflow and the hard state of Cyg X-1

Cited by in corpus (4)

• High-density reflection spectroscopy of black hole X-ray binaries in the hard state
• An evolutionary model for V404 Cyg system
• A possible jet and corona configuration for Swift J1727.8--1613 during the hard state
• Interaction between disk and extended corona in a general relativistic framework