NuSTAR monitoring of MAXI J1348-630: evidence of high density disc reflection

Abstract

We present the broadband spectral analysis of all the six hard, intermediate and soft state NuSTAR observations of the recently discovered transient black hole X-ray binary MAXI J1348-630 during its first outburst in 2019. We first model the data with a combination of a multi-colour disc and a relativistic blurred reflection, and, whenever needed, a distant reflection. We find that this simple model scheme is inadequate in explaining the spectra, resulting in a very high iron abundance. We, therefore, explore the possibility of reflection from a high-density disc. We use two different sets of models to describe the high-density disc reflection: relxill-based reflection models, and reflionx-based ones. The reflionx-based high-density disc reflection models bring down the iron abundance to around the solar value, while the density is found to be $10^{20.3-21.4}\mathrm{c}{\mathrm{m}}^{-3}$. We also find evidence of a high-velocity outflow in the form of $\sim$7.3 keV absorption lines. The consistency between the best-fit parameters for different epochs and the statistical significance of the corresponding model indicates the existence of high-density disc reflection in MAXI J1348-630.

15 pages, 12 figures, 5 tables; accepted for publication in MNRAS

References in corpus (21)

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• The role of the reflection fraction in constraining black hole spin
• X-ray reflection in accreting stellar-mass black hole systems
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• A variable ionized disk wind in the black-hole candidate EXO 1846-031
• NuSTAR low energy effective area correction due to thermal blanket tear
• Studying the Reflection Spectra of the New Black Hole X-ray Binary Candidate MAXI J1631-479 Observed by NuSTAR: A Variable Broad Iron Line Profile
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Cited by in corpus (20)

• On the cosmic evolution of AGN obscuration and the X-ray luminosity function: XMM-Newton and Chandra spectral analysis of the 31.3 deg${}^2$ Stripe 82X
• A variable corona during the transition from type-C to type-B quasi-periodic oscillations in the black hole X-ray binary MAXI J1820+070
• Variability and phase lags of the type-C quasi-periodic oscillation of MAXI J1348-630 with NICER
• Detailed analysis on the reflection component for the black hole candidate MAXI J1348-630
• Transitions and Origin of the Type-B Quasi-Periodic Oscillation in the Black Hole X-ray Binary MAXI~ J1348--630
• Relativistic X-Ray Reflection and Photoionised Absorption in the Neutron-Star Low-Mass X-ray Binary GX 13+1
• Tell-Tale Spectral Signatures of MHD-driven Ultra-Fast Outflows in AGNs
• The current state of disk wind observations in BHLMXBs through X-ray absorption lines in the iron band
• AstroSat view of the newly discovered X-ray transient MAXI~J1803--298 in the Hard-intermediate state
• High-density reflection spectroscopy of black hole X-ray binaries in the hard state
• A multi-wavelength study of the hard and soft states of MAXI J1820+070 during its 2018 outburst
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• A moderate spin for the black hole in X-ray binary MAXI J1348-630 revealed by Insight-HXMT
• Broadband Spectral properties of MAXI J1348--630 using AstroSat Observations
• Probing the accretion geometry of the atoll source 4U 1702-429 in different spectral states with NICER, NuSTAR, and AstroSat
• The spin measurement of MAXI J1348-630 using the Insight-HXMT data
• Accretion disc winds in X-ray binaries
• Impact of reflection Comptonization on X-ray reflection spectroscopy: the case of EXO 1846-031
• Black hole spin estimation of XTE J2012+381 using simultaneous observations of Swift/XRT and NuSTAR
• Investigating the consistency of the shape and flux of X-ray reflection spectra in the hard state with an accretion disk reaching close to the black hole