A moderate spin for the black hole in X-ray binary MAXI J1348-630 revealed by Insight-HXMT

Abstract

MAXI J1348-630 is a low-mass X-ray black hole binary located in the Galaxy and undergone the X-ray outburst in 2019. We analyzed the observation data in very soft state during the outburst between MJD 58588 and MJD 58596 based on the Insight-HXMT observations from 2 -- 20 keV via the continuum fitting method to measure the spin of the stellar-mass black hole in MAXI J1348-630. The inner disk temperature and the apparent inner disk radius were found to be $0.47\pm 0.01\mathrm{keV}$ and $5.33\pm 0.10R_g$ from the observation data modeled by the multicolor disc blackbody model. Assuming the distance of the source $D\sim 3.4\mathrm{kpc}$, the mass of the black hole $M\sim 11M_{\odot }$, and the inclination of the system $i\sim 29.2^{\circ }$, the spin is determined to be $a_{\star }=0.41\pm 0.03$ for fixing hardening factor at 1.6 and $n_H=8.6\times 10^{21}\mathrm{c}{\mathrm{m}}^{-2}$. Besides, considering the uncertainty of the parameters $D,M,i$ of this system, with the Monte Carlo analysis, we still confirm the moderate spin of the black hole as $a_{\star }=0.42_{-0.50}^{+0.13}$. Some spectral parameters (e.g., column density and hardening factor) which could affect the measurements of the BH spin are also briefly discussed.

10 pages, 14 figures, 5 tables, accept for publication in MNRAS

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