Long-term project observations for project P1101 semester 2025OCTS_06

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.

我们提出一项长期观测计划，拟利用穆里扬（Murriyang）望远镜的UWL系统对极为活跃的快速射电暴（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最活跃快速射电暴之一，同时还展现出极端的转动量度（Rotation Measure，RM）与色散量度（Dispersion Measure，DM）演化特征，以及3吉赫兹频段下的独特行为。这使得UWL接收机成为开展该重复快速射电暴详细研究与长期监测的理想工具。通过本项目，我们预期将探测到该快速射电暴的大量爆发样本。我们将与500米口径球面射电望远镜（Five-hundred-meter Aperture Spherical radio Telescope，FAST）开展合作，旨在研究FRB 20190520B各项属性的时间演化特性，借助高灵敏度手段深化对极宽带宽下偏振特性的认知，并进一步揭示快速射电暴的局域环境与辐射机制。