Year: 2025
Type: article
Abstract: We present an X-ray spectral analysis of a black hole X-ray binary, SLX 1746-331, during the 2023 outburst using five Insight-HXMT observations. We jointly use the reflection model relxillcp and the general relativistic thermal thin disk model kerrbb to fit the spectra from 2 to 100 keV. By jointly fitting the five spectra, we constrain the black hole mass to be M = 5.8 ± 0.3M ⊙ and the dimensionless spin parameter to be a * = 0.8 8 − 0.02 + 0.01 (90% statistical confidence). The reflection model shows that SLX 1746-331 is a high-inclination system with the inclination angle i = 63 . ° 7 − 1.0 + 1.3 , and the accretion disk has a density log N ∼ 16 cm − 3 . In addition, with the different reflection model relxilllp, which assumes a lamppost geometry corona, we still obtain similar results.
Source: The Astrophysical Journal
Authors: Jiashi Chen, Wei Wang
Institution: Wuhan University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $4,499
Awards: G2847548606, G4454049144, G6611298485
OpenAlex ID: W4410102206