Pursuit of the mystery of Fast Radio Bursts from globular clusters
Fast Radio Bursts(FRBs) are luminous, millisecond timescale radio transients known to originate from cosmological distances. The origins of FRBs are presently unknown, although magnetars are a leading progenitor candidate. Magnetars originate in cre-collapse supernova events in young stellar populations, so the discovery of an FRB FRB20200120E from a Globular Cluster(GC) in the nearby disk galaxy M81 came as a surprise since GCs are an ancient population. Motivated by this discovery, the speaker and his research team undertook baseband observations of PSR J1823-3021A, the most active Giant Pulse(GP) emitter in a GC with the MeerKAT UHF band receiver (544~1088MHz) to compare giant pulse with FRBs. The distant periodicity and low polarisation of GPs differentiate them from typical FRBs, although potential quasi-periodicity substructures in some GPs may suggest a connection to magnetars/FRBs. They also present a FAST observation campaign to search for further FRBs from nearby GCs, focusing on a nearby elliptical galaxy, M49. Lastly, in this talk, the speaker will briefly present the current status of the Bustling Universe Radio Survey Telescope in Taiwan(BURSTT) which is a dedicated survey aiming to search for FRBs in the nearb universe with its extremely wide field of view (~10,000 square degrees).
時間：2024.12.23(一) 19:00~20:15
地點：香港理工大學 QR611室
講者：何建璋 (博士生；Australian National University: Swinburne University of Technology)
語言：粵語
免費會議，參加者需要報名
此活動由香港天文學會 理論天文組主辦。
