论文标题
黑洞二进制4U 1957+115的光谱特征：多损新透视图
Spectral characteristics of the black hole binary 4U 1957+115: A multi-mission perspective
论文作者
论文摘要
我们使用Astrosat，Swift和Nustar观测值报告了持续的黑洞X射线二进制二进制的光谱分析，4U 1957+115。使用磁盘排放，热构造和模糊反射组件进行建模表明，源处于高柔软状态，磁盘通量$ \ sim 87 $ 87 $ 87 $％的总和高能光子指数$ \ sim2.6 $。有证据表明，内部磁盘半径差异为$ \ sim25 $％，或者颜色硬化因子更改为$ \ sim12 $％。内部磁盘半径的值表明，对于非旋转黑洞，黑洞质量为$ <7 $ m $ _ \ odot $，源位于$> 30 $ kpc的位置。另一方面，快速旋转的黑洞将与更合理的黑洞质量$ <10 $ m $ _ \ odot $和$ \ sim10 $ kpc的源距离一致。将距离固定到$ 10 $ kpc并使用相对论积聚磁盘模型，将黑洞质量限制为6 m $ _ \ odot $，而倾斜角度则为72 $^{\ circ} $。在积聚速率和内部半径之间或吸积率和色因子之间检测到正相关。
We report spectral analysis of the persistent black hole X-ray binary, 4U 1957+115, using AstroSat, Swift and NuSTAR observations carried out between 2016-2019. Modelling with a disk emission, thermal comptonization and blurred reflection components revealed that the source was in the high soft state with the disk flux $\sim 87$ % of the total and high energy photon index $\sim2.6$. There is an evidence that either the inner disk radius varied by $\sim25$ % or the colour hardening factor changed by $\sim12$ %. The values of the inner disk radius imply that for a non-spinning black hole, the black hole mass is $<7$ M$_\odot$ and the source is located $>30 $ kpc away. On the other hand, a rapidly spinning black hole would be consistent with the more plausible black hole mass of $< 10$ M$_\odot$ and a source distance of $\sim10$ kpc. Fixing the distance to $10$ kpc and using a relativistic accretion disk model, constrained the black hole mass to 6 M$_\odot$ and inclination angle to 72$^{\circ}$. A positive correlation is detected between the accretion rate and inner radii or equivalently between the accretion rate and colour factor.
