标题： 十年间重复快速射电暴源的演化 显示英文标题

标题： Decadal evolution of a repeating fast radio burst source

摘要： 快速射电暴（FRBs）——最明亮的宇宙射电爆炸——的起源仍然未知。 承载着FRBs起源的关键线索，FRBs的长期演化尚未得到确认，因为该领域仍处于初期阶段，大多数FRBs仅被观测到一次。 在此，我们报告了FRB~20121102A的十年演化清晰证据，这是第一个精确定位的重复暴。 结合档案数据，自2020年以来我们的FAST和GBT监测活动揭示了局部色散测量（DM）显著下降了7%。 在最后观测时段检测到的30,755$\pm$16 $\mathrm{rad\,m^{-2}}$的旋转测量（RM）相比2016年12月的值减少了70%。 $\sigma_{RM}$参数，用于描述源周围磁离子环境的复杂性，显示减少了13%。 这些总体趋势揭示了一个演化的FRB环境，这可能源于与FRB中心引擎增强的对流风相关的早期超新星阶段。 显示英文摘要

摘要： The origin of fast radio bursts (FRBs), the brightest cosmic radio explosions, is still unknown. Bearing critical clues to FRBs' origin, the long-term evolution of FRBs has yet to be confirmed, since the field is still young and most FRBs were seen only once. Here we report clear evidence of decadal evolution of FRB~20121102A, the first precisely localized repeater. In conjunction with archival data, our FAST and GBT monitoring campaign since 2020 reveals a significant 7% decline of local dispersion measure (DM). The rotation measure (RM) of 30,755$\pm$16 $\mathrm{rad\,m^{-2}}$ detected in the last epoch represents a 70% decrease compared to that from December 2016. The $\sigma_{RM}$ parameter, which describes the complexity of the magneto-ionic environment surrounding the source, was shown to have decreased by 13%. These general trends reveal an evolving FRB environment, which could originate from an early-phase supernova associated with an enhanced pair wind from the FRB central engine.