Analysis of the reflection spectra of MAXI J1535-571 in the hard and intermediate states

Abstract

We report results on the joint-fit of the NuSTAR and HXMT data for the black hole X-ray binary candidate MAXI J1535-571. The observations were obtained in 2017 when the source evolved through the hard, hard-intermediate and soft-intermediate states over the rising phase of the outburst. After subtracting continuum components, X-ray reflection signatures are clearly showed in those observations. By modeling the relativistic reflection in detail, we find that the inner radius $R_{\mathrm{in}}$ is relatively stable with $R_{\mathrm{in}}\lesssim 1.55R_{\mathrm{g}}$ during the three states, which implies that the inner radius likely extends to the innermost stable circular orbit even in the bright hard state. When adopting $R_{\mathrm{in}}=R_{\mathrm{ISCO}}$, the spin parameter is constrained to be $0.985_{-0.004}^{+0.002}$ at 90% confidence (statistical only). The best-fitting results reveal that the inclination of the inner accretion disc is $\sim 70-74$ degrees, which notably conflicts with the apparent orientation of the ballistic jet ($⩽$45 degrees). In addition, both the photon index and the electron temperature increase during the transition from hard to soft state. It seems that the corona evolves from dense low-temperature in the LHS to tenuous high-temperature after the state transition, which indicates that the state transition is accompanied by the evolution of the coronal properties.

11 pages, 5 figures, 3 tables; Publicated in MNRAS. We update Fig. 5 in paper which does not affect conclusions

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• The current state of disk wind observations in BHLMXBs through X-ray absorption lines in the iron band
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• Impact of reflection Comptonization on X-ray reflection spectroscopy: the case of EXO 1846-031
• Accretion flows in the hard state of black hole X-ray binaries: the effect of hot gas condensation
• The spin measurement of MAXI J0637-430: a black hole candidate with high disk density
• The width-flux relation of the broad iron line during the state transition of the black hole X-ray binaries
• QPOML: A Machine Learning Approach to Detect and Characterize Quasi-Periodic Oscillations in X-ray Binaries