Parkes observations for project P958 semester 2019OCTS_31

Fast radio bursts (FRBs) continue to raise more questions than they answer. Until last year, only one burst – the only one known to repeat - had been localized to a bright radio nebula (either a young supernova remnant or pulsar wind nebulae) in a distant dwarf galaxy. \r\nOver the last two year searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 31 bursts, five of which have been localised to host galaxies at redshifts ranging from 0.1 to 0.5. These bursts and their hosts are very unlike the repeater, suggesting there may be a dichotomy in the population. However one of the arcminute-localised ASKAP FRBs has recently been found to repeat.\r\n Here we propose to search and study repetitions in this FRB population. Our comprehensive sample and a dense monitoring campaign of well localised bursts, at a fluence limit more than 60 times lower than that of their detections to characterise the fraction of bursts that repeat. For bursts that repeat the unique wide bandwidth observations will be used to test leading models of burst emission.

快速射电暴（Fast Radio Bursts, FRBs）引发的疑问远多于其已解答的问题。直至去年，仅有一例被证实会重复爆发的射电暴，被定位至遥远矮星系内的明亮射电星云——要么为年轻超新星遗迹，要么为脉冲星风云。
过去两年间，借助澳大利亚平方千米阵探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天观测已探测到31例射电暴，其中5例被定位至红移值介于0.1至0.5之间的宿主星系。此类射电暴及其宿主星系与此前发现的重复暴差异显著，这暗示FRB群体或存在二分性。然而，近期有1例经ASKAP完成角分级定位的FRB被证实会重复爆发。
本研究拟针对该FRB群体开展重复暴搜寻与相关研究：我们将通过完备的样本选取，以及对定位精度较高的射电暴开展高密度监测计划，将能流探测极限降至此前探测阈值的1/60以下，以此表征重复暴在FRB群体中的占比。
针对重复暴，我们将借助独具特色的宽频带观测数据，检验射电暴爆发机制的主流理论模型。