arXiv Daily: 2026-03-23

Tags: #arXiv #Astrophysics

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[9] | Degeneracy in Accretion Disk Spectra from Naked Singularities and Kerr Black Holes: Application to the AGN MCG-06-30-15

Authors: Vishva Patel, Sayantan Bhattacharya, Sudip Bhattacharyya et al. | Targets: MCG-06-30-15

该研究探讨了裸奇点与克尔黑洞吸积盘光谱的简并性，并利用NuSTAR数据对AGN MCG-06-30-15进行了能谱拟合分析。

研究背景：引力坍缩的终点是形成黑洞还是裸奇点（Naked Singularity）是物理学界长期争论的焦点。区分这两类致密天体是验证广义相对论及引力本质的关键。本研究旨在探讨吸积盘的相对论性光谱是否具备区分裸奇点与克尔黑洞的观测能力，以寻找区分两者的观测判据。

数据方法：研究团队利用 NuSTAR 卫星对活动星系核 MCG-06-30-15 的 X 射线观测数据，构建了基于 JMN-1 裸奇点几何（匹配史瓦西外部时空）的薄盘吸积模型。通过将该模型与标准克尔黑洞及史瓦西黑洞模型进行拟合对比，并结合 relxill 相对论反射组件，系统评估了不同时空背景下的光谱特征。

核心结论：研究发现，不旋转的 JMN-1 裸奇点与旋转的克尔黑洞在光谱拟合上表现出极高的简并性，两者拟合质量均显著优于史瓦西黑洞。这种简并性意味着仅凭吸积盘光谱可能导致错误的自旋测量结果。若能结合独立的自旋测量手段，则有望打破简并并识别裸奇点。该发现对理解引力波源与 X 射线双星中致密天体自旋分布的差异具有重要参考价值。

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