旧黑洞的新自旋：EXO 1846-031的NuSTAR光谱
A New Spin on an Old Black Hole: NuSTAR Spectroscopy of EXO 1846-031
摘要：
黑洞候选者EXO 1846-031在经历了至少25年的平静之后，于2019年经历了一次爆发。我们于2019年8月3日使用\textit{NuSTAR}观察了系统。3- 79 keV能谱显示出强烈的相对论反射特征。我们的基线模型给出了一个接近最大的黑洞自旋值$a=0.997_{-0.002}^{+0.001}$（$1σ$统计误差）。这个高值名义上排除了中央发动机藏有中子星的可能性。使用几种模型，我们测试我们的测量假设的吸积盘的密度，日冕的性质，选择盘连续模型，并增加反射从外部区域的吸积盘的鲁棒性。所有测试的模型同意一个非常高的黑洞自旋值和一个高值的内吸积盘的$θ\approx73^\circ$。我们讨论的影响，这种自旋测量人口的恒星质量黑洞与已知的自旋，包括LIGO事件。
英文摘要：
The black hole candidate EXO 1846-031 underwent an outburst in 2019, after at least 25 years in quiescence. We observed the system using \textit{NuSTAR} on August 3rd, 2019. The 3--79 keV spectrum shows strong relativistic reflection features. Our baseline model gives a nearly maximal black hole spin value of $a=0.997_{-0.002}^{+0.001}$ ($1σ$ statistical errors). This high value nominally excludes the possibility of the central engine harboring a neutron star. Using several models, we test the robustness of our measurement to assumptions about the density of the accretion disk, the nature of the corona, the choice of disk continuum model, and addition of reflection from the outer regions of the accretion disk. All tested models agree on a very high black hole spin value and a high value for the inclination of the inner accretion disk of $θ\approx73^\circ$. We discuss the implications of this spin measurement in the population of stellar mass black holes with known spins, including LIGO events.
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