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.

arXiv comment15 pages, 12 figures, 5 tables; accepted for publication in MNRAS

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• Variability and phase lags of the type-C quasi-periodic oscillation of MAXI J1348-630 with NICER
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• 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
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• AstroSat view of the newly discovered X-ray transient MAXI~J1803--298 in the Hard-intermediate state
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• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
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• Broadband Spectral properties of MAXI J1348--630 using AstroSat Observations
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• 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
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