用X射线连续拟合方法估算黑洞候选者MAXI J1659-152的自旋
Estimating the spin of the black hole candidate MAXI J1659-152 with the X-ray continuum-fitting method
摘要：
MAXI J1659-152是一颗瞬变X射线双星，其中包含一颗黑洞候选者。MAXI J1659-152于2010年9月25日在其唯一已知的爆发中被发现。先前发表的关于这次爆发的研究表明，MAXI J1659-152可能具有极端的逆行自旋，如果得到证实，将为黑洞自旋的起源提供重要线索。本文利用\cite{Torres2021}提供的更新的动力学双星系统参数（即黑洞质量、轨道倾角和源距），分析了\emph{RXTE} /PCA的65个MAXI J1659-152的光谱，以评估自旋参数。最终选择9个光谱匹配我们的$f_{\mathrm{sc}} \lesssim 25 \%$，软态标准，我们应用相对论薄盘光谱模型\texttt{kerrbb2}超过3.0-45.0 keV。我们发现倾斜角与自旋成反比，考虑到倾斜角的可能值，我们通过X射线连续拟合将自旋约束为90%置信区间的$-1 < a_{*} \lesssim 0.44$。我们只能排除极端的正旋转。我们确认，一个极端的逆行的解决方案是可能的，并不排除考虑吸积扭矩的年轻的系统。
英文摘要：
As a transient X-ray binary, MAXI J1659-152 contains a black hole candidate as its compact star. MAXI J1659-152 was discovered on 2010 September 25 during its only known outburst. Previously-published studies of this outburst indicate that MAXI J1659-152 may have an extreme retrograde spin, which, if confirmed, would provide an important clue as to the origin of black hole spin. In this paper, utilizing updated dynamical binary-system parameters (i.e. the black hole mass, the orbital inclination and the source distance) provided by \cite{Torres2021}, we analyze 65 spectra of MAXI J1659-152 from \emph{RXTE}/PCA, in order to assess the spin parameter. With a final selection of 9 spectra matching our $f_{\mathrm{sc}} \lesssim 25 \%$, soft-state criteria, we apply a relativistic thin disk spectroscopic model \texttt{kerrbb2} over 3.0-45.0 keV. We find that inclination angle correlates inversely with spin, and, considering the possible values for inclination angle, we constrain spin to be $-1 < a_{*} \lesssim 0.44$ at 90\% confidence interval via X-ray continuum-fitting. We can only rule out an extreme prograde (positive) spin. We confirm that an extreme retrograde solution is possible and is not ruled out by considering accretion torques given the young age of the system.
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