Long-term project observations for project P1101 semester 2025OCTS_05

We propose a long-term project to monitor a very active repeater, FRB 20190520B, with Murriyang's UWL system. Our previous observations show that FRB 20190520B is not only among the most active FRBs that can be observed with Murriyang, but also shows extreme rotation measure (RM) and dispersion measure (DM) evolution, along with distinctive behavior at 3GHz frequency. This makes the UWL receiver uniquely suited for detailed studies and long-term monitoring of this repeating FRB. Through this program, we anticipate detecting a large sample of bursts from this FRB. In collaboration with FAST, we aim to investigate the time evolution of various properties of FRB 20190520B, enhance our understanding of polarisation across an extremely wide bandwidth with high sensitivity, and gain deeper insights into the local environment and emission mechanisms of FRBs.

本研究提出一项长期观测计划，将利用穆里扬（Murriyang）望远镜的UWL系统对重复快速射电暴（Fast Radio Burst, FRB）20190520B开展监测。此前的观测结果显示，FRB 20190520B不仅是穆里扬望远镜可观测到的活跃度最高的快速射电暴之一，同时还呈现出极端的旋转量度（Rotation Measure, RM）与色散量度（Dispersion Measure, DM）演化特征，且在3GHz频段表现出独特的辐射行为。这使得UWL接收机成为针对该重复快速射电暴开展详细研究与长期监测的最优适配设备。通过本计划，我们预计将探测到该快速射电暴的大量爆发事件样本。本项目将与中国天眼（Five-hundred-meter Aperture Spherical radio Telescope, FAST）展开合作，旨在探究FRB 20190520B各项属性的时间演化规律，依托高灵敏度条件深化对极宽频段内偏振特性的认知，并进一步深入解析快速射电暴的局域环境与辐射机制。