The spin measurement of the black hole SLX 1746-331 using Insight-HXMT observations
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arXiv
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| Autori principali: | , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908304712663040 |
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| author | Chen, Jiashi Wang, Wei |
| author_facet | Chen, Jiashi Wang, Wei |
| contents | We present an X-ray spectral analysis of a black hole X-ray binary SLX 1746-331 during the 2023 outburst using five \textit{Insight}-HXMT observations. We jointly use the reflection model \texttt{relxillcp} and the general relativistic thermal thin disk model \texttt{kerrbb} to fit the spectra from 2 - 100 keV. By jointly fitting the five spectra, we constrained the black hole mass to be $M=5.8\pm 0.3 M_{\odot}$ and dimensionless spin parameter to be $a_{*}=0.88^{+0.01}_{-0.02}$ (90 percent statistical confidence). The reflection model shows that SLX 1746-331 is a high-inclination system with the inclination angle $i=63.7^{+1.3}_{-1.0}$ degrees, the accretion disk has a density $\rm{log}N\sim 16 ~\rm cm^{-3}$. In addition, with the different reflection model \texttt{relxilllp}, which assumes a lamp-post geometry corona, we still give similar results. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_04760 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The spin measurement of the black hole SLX 1746-331 using Insight-HXMT observations Chen, Jiashi Wang, Wei High Energy Astrophysical Phenomena Solar and Stellar Astrophysics We present an X-ray spectral analysis of a black hole X-ray binary SLX 1746-331 during the 2023 outburst using five \textit{Insight}-HXMT observations. We jointly use the reflection model \texttt{relxillcp} and the general relativistic thermal thin disk model \texttt{kerrbb} to fit the spectra from 2 - 100 keV. By jointly fitting the five spectra, we constrained the black hole mass to be $M=5.8\pm 0.3 M_{\odot}$ and dimensionless spin parameter to be $a_{*}=0.88^{+0.01}_{-0.02}$ (90 percent statistical confidence). The reflection model shows that SLX 1746-331 is a high-inclination system with the inclination angle $i=63.7^{+1.3}_{-1.0}$ degrees, the accretion disk has a density $\rm{log}N\sim 16 ~\rm cm^{-3}$. In addition, with the different reflection model \texttt{relxilllp}, which assumes a lamp-post geometry corona, we still give similar results. |
| title | The spin measurement of the black hole SLX 1746-331 using Insight-HXMT observations |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2504.04760 |