Parkes observations for project P1183 semester 2025OCTS_17

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.

历经近三年的监测工作，依托帕克斯望远镜（Parkes Telescope）与FAST望远镜（Five-hundred-meter Aperture Spherical radio Telescope, FAST）的观测数据，FRB 20220529被证实为极具研究价值的重复快速射电暴（Fast Radio Burst, FRB）。该暴源具备迄今已知最长的活动持续时长之一，且存在约200天的旋转测量（Rotation Measure, RM）周期候选信号。得益于帕克斯望远镜与FAST望远镜的高频次观测计划，研究团队在该暴源中观测到了突发性的旋转测量耀斑。这是首次在快速射电暴中观测到此类‘旋转测量耀斑’现象，暗示该暴源所处环境存在偶发的冠状物质抛射（coronal mass ejection）活动。这为研究快速射电暴的爆发环境，以及探究暴活动与其他暴参数之间的关联提供了独一无二的研究契机。若该周期性信号与‘旋转测量耀斑’现象均得到进一步证实，二者将互为佐证，成为快速射电暴双星起源假说的确凿证据。在过往的分析中，帕克斯望远镜与FAST望远镜的观测数据均被证明不可或缺。FAST的高灵敏度使其得以捕捉到大量快速射电暴信号，而帕克斯望远镜的宽带接收机即便在暴发率较低的阶段，也能保持良好的暴源探测效率。尤为值得注意的是，在此次旋转测量耀斑事件期间，帕克斯望远镜观测到的两例高信噪比（signal-to-noise ratio, SNR）暴信号，为理解旋转测量的变化提供了关键支撑。为进一步开展FRB 20220529的相关研究，我们已计划每两周开展一次FAST常规观测，每次对该源进行20分钟的监测。因此，我们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，并采用全偏振观测方案。