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Fast Radio Bursts (FRBs) are millisecond-duration, high-energy radio transients of unknown origin, whose large dispersion measures indicate extragalactic, and possibly cosmological, distances. With the rapid advancement of radio telescope capabilities, the number of detected FRBs has increased dramatically, greatly advancing studies of their physical origins and cosmological applications. However, most FRBs are one-off events, with fewer than 5% identified as repeaters; these active sources offer unique opportunities to explore their local environments and intrinsic properties. In this talk, we present the discovery of the first persistently active repeating source, FRB 20190520B, based on observations with the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), and review recent studies on the evolution of its propagation effects, its circumsource environment, and its possible binary origin.

BIO

Chenhui Niu (牛晨辉)，He is a Research Fellow at the School of Physical Science and Technology, Central China Normal University. His research primarily focuses on the detection of Fast Radio Bursts (FRBs), the analysis of their propagation effect evolution, and the development of related digital backend systems. He has led or participated in several national and provincial-levelresearch projects and has been selected for multiple talent programs, including the Hubei Provincial QB talentProgram (湖北省QB项目), the Wuhan Talent Program (武汉英才计划), and the Hubei Postdoctoral Follow-up Support Program.

From 2019 to 2022, he conducted postdoctoral research at the National Astronomical Observatories, Chinese Academy of Sciences, where he served as a FAST Fellowship Young Researcher. During this period, using the Five-hundred-meter Aperture Spherical Radio Telescope (FAST), he led the discovery of several new FRB sources and made the first discovery of the first persistently active repeating FRB, FRB 20190520B. This work was published in Nature and was selected as one of the “Top Ten Scientific Advances in China” in 2022 by the Ministry of Science and Technology, as well as one of the “Top Ten International Science and Technology News” of 2022 by China Central Television (CCTV).

Host: Di Li