M87中的吸积流是否处于磁停滞状态？

中文摘要 AI 辅助

关于M87中的吸积盘是否处于磁停滞状态仍存在争议。我们假设一个弱外部磁场被吸积盘向内拖拽，该磁场在黑洞视界附近通过Blandford-Znajek机制被显著增强以驱动强喷流。M87的喷流功率已通过观测数据得到良好约束，而M87吸积流内区的吸积率则通过拟合多波段连续谱和法拉第旋转测量数据来估算，并由此推导出盘的表面密度。我们的计算表明，为了产生观测到的喷流功率$P_{\rm jet}=3.2\times 10^{43}~\rm erg~s^{-1}$，需要在盘外缘具有数百$\mu\rm G$的外部磁场，该磁场在盘内被放大至黑洞视界处的数百高斯，且M87中的吸积流必须处于磁停滞状态。只有当喷流功率显著低于$\sim 1.75 \times 10^{43} \rm erg~ s^{-1}$时，M87中才允许存在标准正常演化（SANE）盘。

英文摘要

It is still debating on whether the disc is magnetically arrested in M87. We assume that a weak external magnetic field is dragged inwards by the accretion disc, which is substantially enhanced to drive strong jets near the black hole horizon via Blandford-Znajek mechanism. The jet power of M87 has been well constrained with the observational data, while the accretion rate in the inner region of the accretion flow in M87 is estimated by fitting the multi-waveband continuum spectrum and the data of the Faraday rotation measurement, with which the surface density of the disc is derived. Our calculations show that, in order to produce the observed jet power $P_{\rm jet}=3.2\times 10^{43}~\rm erg~s^{-1}$, an external field with several hundred $μ\rm G$ at the outer edge of the disc is required to be amplified in the disc to hundreds G at the BH horizon, and the accretion flow in M87 must be magnetically arrested. A standard and normal evolution (SANE) disc is allowed in M87, only if the jet power is significantly lower than $\sim 1.75 \times 10^{43} \rm erg~ s^{-1}$,

发表机构

• Institute for Astronomy, School of Physics, Zhejiang University（浙江大学物理学院天体物理研究所）
• Center for Cosmology and Computational Astrophysics, School of Physics, Zhejiang University（浙江大学物理学院宇宙学与计算天体物理中心）
• Department of Astronomy, School of Physics and Astronomy, Key Laboratory of Astroparticle Physics of Yunnan Province, Yunnan University（云南大学物理与天文学院天文学系云南省高能粒子物理重点实验室）
• School of Physics and Electronic Science, Guizhou Normal University（贵州师范大学物理科学与电子科学学院）
• Department of Astronomy, School of Physics, Huazhong University of Science and Technology（华中科技大学物理学院天文学系）

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