X射线双星MAXI J1820 +070黑洞自旋的估算
Estimating the black hole spin for the X-ray binary MAXI J1820+070
摘要：
MAXI J1820+070是新发现的X射线黑洞双星，其动力学参数黑洞质量、倾角和源距最近得到了估计。\emph{Insight} -HXMT从2018年3月14日起观测到了它的整个爆发。在这项工作中，我们试图估计自旋参数$a_*$，使用连续拟合方法和应用一个完全相对论薄盘模型的软态光谱\emph{Insight} -HX MT。众所周知，在这种方法中，$a_*$强烈地依赖于三个动力学参数，并且我们已经检查了两组参数。采用我们的首选参数：$M$ = $8.48^{+0.79}_{-0.72}~M_\odot$，$i=63^\circ\pm3^\circ$和$D=2.96\pm0.33$ kpc，我们发现了一个慢自旋的黑洞$a_*=0.14 \pm 0.09$（$1σ$），它的自旋参数与大多数其它系统一样，是近似的.而如果取不同的动力学参数，黑洞也有可能具有逆行自旋（小于0）。
英文摘要：
MAXI J1820+070 is a newly-discovered black hole X-ray binary, whose dynamical parameters, namely the black hole mass, the inclination angle and the source distance, have been estimated recently. \emph{Insight}-HXMT have observed its entire outburst from March 14th, 2018. In this work, we attempted to estimate the spin parameter~$a_*$, using the continuum-fitting method and applying a fully-relativistic thin disk model to the soft-state spectra obtained by \emph{Insight}-HXMT. It is well know that $a_*$ is strongly dependent on three dynamical parameters in this method, and we have examined two sets of parameters. Adopting our preferred parameters: $M$ = $8.48^{+0.79}_{-0.72}~M_\odot$, $i=63^\circ\pm3^\circ$ and $D=2.96\pm0.33$ kpc, we found a slowly-spinning black hole of $a_*=0.14 \pm 0.09$ ($1σ$), which give a prograde spin parameter as majority of other systems show. While it is also possible for the black hole to have a retrograde spin (less than 0) if different dynamical parameters are taken.
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