Parkes observations for project P958 semester 2019OCTS_13

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）带来的疑问远多于其已解答的问题。直至去年，仅有一种暴——也是目前已知唯一会重复爆发的快速射电暴——被定位到遥远矮星系中的一颗明亮射电星云（要么为年轻超新星遗迹，要么为脉冲星风云星云）内。
过去两年间，依托澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天探测共发现31次快速射电暴，其中5次被定位到红移值介于0.1至0.5之间的宿主星系中。这些射电暴及其宿主星系与此前的重复暴特征差异显著，暗示快速射电暴族群可能存在二分性。不过近期研究发现，其中一例经角分级定位的ASKAP探测快速射电暴会重复爆发。
本研究拟对该类快速射电暴族群开展重复暴搜寻与研究工作。我们将依托覆盖全面的样本，以及针对定位精度较高的射电暴开展的密集监测计划——该监测的流量密度极限较此前探测阈值低60倍以上——以测算会重复爆发的快速射电暴所占比例。针对重复爆发的快速射电暴，本研究将利用独具特色的宽频带观测数据，对快速射电暴辐射的主流理论模型进行验证。