Parkes observations for project P1183 semester 2024OCTS_11

After nearly two years of monitoring, comprising 126.7 hours over 57 observations with the Parkes telescope and 49.4 hours across 101 observations with the FAST telescopes, we have determined that FRB 20220529 is an extremely active repeater. It exhibits one of the longest activity durations and a potential period. Due to frequent observations scheduled with both Parkes and FAST, we recently observed an abrupt rotation measure (RM) flare in this source. This is the first detection of such an ``RM flare'' in a fast radio burst (FRB), suggesting that the source is in an environment with occasionally erupting coronal mass ejection. This presents a unique opportunity to study the eruption environment of FRBs and investigate the relation between burst activity and other burst parameters. If confirmed, the periodicity and the ``RM flare'' of FRB 20220529 would corroborate each other and become a ``smoking gun'' of the binary origin of FRB. In our previous analysis, both Parkes and FAST observations have proven essential. While FAST's higher sensitivity has enabled the capture of many bursts, Parkes' wideband receiver has provided a good burst detection rate even during low-rate phases. Notably, during the RM flare, two high signal-to-noise ratio bursts from Parkes have been crucial in understanding the RM variations. To further investigate FRB 20220529, we have scheduled regular FAST observations every fortnight, monitoring the source for 20 minutes each time. Therefore, we also propose to monitor FRB 20220529 using the Parkes UWL receiver, ensuring high-time resolution and employing full-polarization observations.历经近两年的监测工作，我们依托帕克斯望远镜（Parkes Telescope）完成57次观测，总时长126.7小时；借助500米口径球面射电望远镜（FAST）开展101次观测，累计时长49.4小时。经分析确认，FRB 20220529是一颗活跃度极高的重复快速射电暴源，其拥有目前已知最长的活动持续时长之一，且存在潜在的周期特征。由于我们针对帕克斯望远镜与FAST望远镜均安排了高频观测计划，近期首次在该源中观测到一次突发性旋转测量（Rotation Measure，RM）耀发——这是人类首次在快速射电暴（Fast Radio Burst，FRB）中探测到此类"RM耀发"现象，暗示该源所处环境中存在间歇性爆发的日冕物质抛射（Coronal Mass Ejection，CME）。这一发现为研究FRB的爆发环境提供了独一无二的契机，也有助于探索暴源活动与其他爆发参数之间的关联。若该周期性特征与"RM耀发"均得到进一步验证，二者将互为佐证，成为FRB双星起源假说的"决定性证据"。在我们此前的分析中，帕克斯望远镜与FAST望远镜的观测数据均发挥了不可或缺的作用：FAST更高的探测灵敏度帮助我们捕获了大量爆发事件，而帕克斯望远镜的宽波段接收机即便在爆发率较低的阶段，也能保持出色的爆发探测效率。值得注意的是，在本次RM耀发期间，帕克斯望远镜获取的两例高信噪比（Signal-to-Noise Ratio）爆发事件，对理解旋转测量的变化起到了关键作用。为进一步研究FRB 20220529，我们已计划每两周开展一次FAST观测，每次对该源进行20分钟的监测。同时，我们还提议利用帕克斯望远镜的UWL接收机开展FRB 20220529的监测工作，以实现高时间分辨率的全偏振观测。