论文标题
估计X射线二进制Maxi J1820+070的黑洞旋转
Estimating the black hole spin for the X-ray binary MAXI J1820+070
论文作者
论文摘要
Maxi J1820+070是新发现的黑洞X射线二进制文件，最近估计了其动力学参数，即黑洞质量，倾斜角和源距离。 \ emph {Insight} -hxmt从2018年3月14日开始观察其整个爆发。在这项工作中，我们尝试使用连续拟合方法来估计旋转参数〜$ a _*$，并应用了完全相关的薄磁盘模型，以通过\ emph获得的软态模型\ emph {Insight} -hxmt} -hxmt} -hxmt。众所周知，$ a _*$在此方法中很大程度上取决于三个动态参数，我们已经检查了两组参数。 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大多数其他系统显示，前进旋转参数。如果采取不同的动态参数，则黑洞也有可能具有逆行自旋（小于0）。
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.
