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arXiv 2203.08151astro-ph.HEastro-ph.GA
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活跃快速射电暴周围的磁场反转

Magnetic Field Reversal around an Active Fast Radio Burst

S. Dai, Y. Feng, Y. P. Yang, Y. K. Zhang, D. Li, C. H. Niu, P. Wang, M. Y. Xue, B. Zhang, S. Burke-Spolaor, C. J. Law, R. S. Lynch, L. Connor, R. Anna-Thomas, L… 展开作者

S. Dai, Y. Feng, Y. P. Yang, Y. K. Zhang, D. Li, C. H. Niu, P. Wang, M. Y. Xue, B. Zhang, S. Burke-Spolaor, C. J. Law, R. S. Lynch, L. Connor, R. Anna-Thomas, L. Zhang, R. Duan, J. M. Yao, C. W. Tsai, W. W. Zhu, M. Cruces, G. Hobbs, C. C. Miao, J. R. Niu, M. D. Filipovic, S. Q. Zhu

AI总结:

该研究通过观测FRB 20190520B的旋转量度在数月内从正到负的极端变化,首次直接证明了活跃快速射电暴周围存在磁场反转,并探讨了其可能的物理起源。

摘要:

活跃重复快速射电暴(FRB)的环境已被证明是复杂且变化的。最近定位的FRB 20190520B极其活跃,具有已确认的最大宿主星系色散量度,并且是第二个与致密、持续射电源(PRS)相关联的FRB源。磁离子环境的主要示踪剂是旋转量度(RM),它是磁场强度(B)的视线分量和电子密度的路径积分,不允许直接探测B场结构。在这里,我们报告了基于FRB 20190520B的RM观测到的符号变化和极端变化的磁场反转的直接证据,其RM在2021年6月至2022年1月期间从约10000 rad m$^{-2}$变为约-16000 rad m$^{-2}$。这种极端的RM反转在以往任何FRB或任何天文物体中均从未被观测到。FRB内部或其周围B场结构的短期变化可能归因于大质量黑洞附近、双星系统中的磁化伴星,或视线方向上的年轻超新星遗迹。

英文摘要:

The environment of actively repeating fast radio bursts (FRBs) has been shown to be complex and varying. The recently localized FRB 20190520B is extremely active, has the largest confirmed host dispersion measure, and is only the second FRB source associated with a compact, persistent radio source (PRS). The main tracer of the magneto-ionic environments is the rotation measure (RM), a path-integral of the line-of-sight component of magnetic field strength (B) and electron density, which does not allow a direct probe of the B-field configuration. Here we report direct evidence for a B-field reversal based on the observed sign change and extreme variation of FRB 20190520B's RM, which changed from $\sim10000$ rad m$^{-2}$ to $\sim-16000$ rad m$^{-2}$ between June 2021 and January 2022. Such extreme RM reversal has never been observed before in any FRB nor in any astronomical object. The implied short-term change of the B-field configuration in or around the FRB could be due to the vicinity of massive black holes, or a magnetized companion star in binary systems, or a young supernova remnant along the line of sight.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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