Structure Functions of Rotation Measures Revealing the Origin of Fast Radio Bursts

Fa-Yin Wang (NJU); Qin Wu; Rui-Nan Li; Shuang-Xi Yi; Zhen-Yin Zhao

Structure Functions of Rotation Measures Revealing the Origin of Fast Radio Bursts

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arxiv 2411.15546 v2 pith:T23KV2Z3 submitted 2024-11-23 astro-ph.HE

Rui-Nan Li , Zhen-Yin Zhao , Qin Wu , Shuang-Xi Yi , Fa-Yin Wang (NJU) This is my paper

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The structure function (SF) analysis is a powerful tool for studying plasma turbulence. Theoretically, the SF of Faraday rotation measure (RM) is expected to include a geometric component due to the relative orientation of sightlines through an ordered magnetic field. However, observational evidence for this component remains elusive. Here, we report that the SFs of the binary PSR B1744-24A and the repeating fast radio burst (FRB) 20201124A exhibit both a periodic geometric component, caused by binary orbital motion, and a flat statistical component. The statistical component, induced by stochastic fluctuations in electron density and magnetic field, aligns with RM scatter derived from pulse depolarization. These findings indicate that FRB 20201124A has a binary origin and suggest that the periodic geometric component can serve as a diagnostic tool to identify binary companions.

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Multi-year Polarimetric Monitoring of Four CHIME-Discovered Repeating Fast Radio Bursts with FAST
astro-ph.HE 2025-07 conditional novelty 5.0 of 10

Multi-year FAST polarimetry of four repeating FRBs reveals strong RM variability in 64% of known repeaters and a shallow turbulence spectrum in the surrounding plasma.

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