Parkes observations for project P958 semester 2020APRS_32

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 three years searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 35 bursts, eight 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所能解答的问题。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——被定位于遥远矮星系中的明亮射电星云（年轻超新星遗迹或脉冲星风云）。
过去三年间，利用澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder, ASKAP）开展的巡天观测已探测到35次快速射电暴，其中8次被定位于红移范围介于0.1至0.5之间的宿主星系。这些暴及其宿主星系与此前的重复暴差异显著，这暗示快速射电暴的爆发群体可能存在二分性。然而，近期研究发现其中一个由ASKAP以角分为精度定位的快速射电暴会重复爆发。
本研究计划对该类快速射电暴群体的重复爆发行为开展搜寻与研究。我们将依托覆盖全面的样本与针对精确定位暴的高密度监测计划，以比此前探测能流极限低60余倍的观测阈值，量化重复爆发的快速射电暴所占的比例。针对重复爆发的快速射电暴，我们将利用独具特色的宽带宽观测数据，检验当前主流的暴爆发辐射模型。