快速射电暴（FRBs）是源自河外星系的毫秒级射电暂现现象。部分重复快速射电暴因其磁离子环境的变化，表现出法拉第旋转量（RM）的波动。
研究组报道了FRB 20220529（一个位于红移0.18的盘状星系中的重复快速射电暴）的磁离子环境变化。在最初17个月的观测中，其法拉第旋转量的中值为17弧度/平方米，波动幅度为101弧度/平方米。至2023年12月，该值骤升至1977±84弧度/平方米，随后在两周内逐渐恢复至典型水平。这种突变表明一团致密的磁化等离子体云穿过了视线方向。研究组探讨了可能的解释，包括伴星产生的日冕物质抛射、高等离子体湍流或双星轨道运动。
附：英文原文
Title: A sudden change and recovery in the magnetic environment around a repeating fast radio burst
Author: Y. Li, S. B. Zhang, Y. P. Yang, C. W. Tsai, X. Yang, C. J. Law, R. Anna-Thomas, X. L. Chen, K. J. Lee, Z. F. Tang, D. Xiao, H. Xu, X. L. Yang, G. Chen, Y. Feng, D. Z. Li, R. Mckinven, J. R. Niu, K. Shin, B. J. Wang, C. F. Zhang, Y. K. Zhang, D. J. Zhou, Y. H. Zhu, Z. G. Dai, C. M. Chang, J. J. Geng, J. L. Han, L. Hu, D. Li, R. Luo, C. H. Niu, D. D. Shi, T. R. Sun, X. F. Wu, W. W. Zhu, P. Jiang, B. Zhang
Issue&Volume: 2026-01-15
Abstract: Fast radio bursts (FRBs) are millisecond-duration radio transients from extragalactic sources. Some repeating FRBs exhibit variations in their Faraday rotation measure (RM) due to changes in their magneto-ionic environment. We report magneto-ionic variations of FRB 20220529, a repeating FRB from a disk galaxy at redshift 0.18. For the first 17 months of observations, the RM had a median of 17 radians per square meter (rad m2) and a scatter of 101 rad m2. In December 2023, the RM jumped to 1977 ± 84 rad m2, then gradually returned to typical values within 2 weeks. This sudden RM variation indicates that a dense magnetized clump of plasma passed across the line of sight. We discuss potential explanations, including a coronal mass ejection from a companion star, high plasma turbulence, or binary orbital motion.
DOI: adq3225
Source: https://www.science.org/doi/10.1126/science.adq3225