Parkes observations for project P958 semester 2019OCTS_44

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. Over 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. 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（FRBs）始终是未解之谜多于已知答案。截至去年，仅有一次射电暴（已知唯一的重复暴）被定位到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之一）。过去两年间，利用澳大利亚平方公里阵列探路者（ASKAP）开展的搜索已探测到31次射电暴，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。这些射电暴及其宿主星系与重复暴存在显著差异，暗示该群体可能存在二分性。然而，近期发现ASKAP探测到的一个角分尺度定位的FRB存在重复现象。在此，我们提出对该FRB群体的重复现象开展搜索与研究。我们将通过全面样本及对精确定位射电暴的密集监测（流量密度极限比探测阈值低60倍以上），来刻画重复暴的比例。对于重复暴，将利用独特的宽带观测数据来检验主流的射电暴辐射模型。