Parkes observations for project P958 semester 2019OCTS_59

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）引发的疑问远多于其已解答的问题。直至去年，仅发现一例暴——亦是目前已知唯一会重复爆发的暴——被定位于遥远矮星系中的明亮射电星云（要么是年轻超新星遗迹，要么是脉冲星风云）。
在过去两年间，利用澳大利亚平方千米阵列探路者（ASKAP）开展的巡天探测已发现31次暴，其中5次被定位于红移范围0.1至0.5的宿主星系中。这些暴及其宿主星系与该重复暴差异显著，这表明FRB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FRB会重复爆发。
本研究拟针对该FRB群体开展重复爆发的搜寻与研究工作。我们将利用涵盖全面的样本以及对精确定位暴的高密度监测计划，以相较于此前探测低60余倍的流量密度极限，来表征发生重复爆发的暴所占比例。对于会重复爆发的暴，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。