Parkes observations for project P1183 semester 2025OCTS_06

After nearly three years of monitoring, comprising with the Parkes telescope and the FAST telescopes, FRB 20220529 is proven to be an extremely interesting repeater. It exhibits one of the longest activity durations and a potential ~200-day RM period. Due to frequent observations scheduled with both Parkes and FAST, an abrupt rotation measure (RM) flare has been observed 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 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.

历经近三年的帕克斯望远镜（Parkes Telescope）与FAST望远镜（FAST）联合监测，快速射电暴（fast radio burst, FRB）20220529被证实为极具科研价值的重复暴源。该暴源拥有迄今已知最长的活动持续时长之一，且存在疑似约200天的旋转量（rotation measure, RM）周期。得益于帕克斯望远镜与FAST望远镜的高频观测计划，研究人员在该暴源中观测到了一次突发性的旋转量耀变事件。这是首次在快速射电暴中观测到此类"旋转量耀变"现象，表明该暴源所处环境中存在间歇性爆发的日冕物质抛射。这为探究快速射电暴的爆发环境，以及厘清暴活动与其他暴参数间的关联提供了独一无二的契机。若该周期性特征与"旋转量耀变"均得到后续观测验证，二者将相互印证，成为快速射电暴双星起源假说的确凿证据。在既往的分析工作中，帕克斯望远镜与FAST望远镜的观测数据均被证实不可或缺。FAST凭借更高的灵敏度捕捉到了大量暴源信号，而帕克斯望远镜的宽带接收机即便在暴活动低发阶段，也能维持优异的暴信号探测效率。尤为关键的是，在旋转量耀变发生期间，帕克斯望远镜观测到的两例高信噪比暴信号，为解析旋转量的变化特征提供了核心支撑。为进一步开展FRB 20220529的相关研究，团队已规划了FAST的常态化观测方案：每两周开展一次观测，每次持续20分钟以监测该暴源。据此，团队同时提议利用帕克斯望远镜的UWL接收机对FRB 20220529开展监测，以保障高时间分辨率，并采用全偏振观测策略。