Parkes observations for project P958 semester 2019APRS_87

Fast radio bursts (FRBs) continue to raise more questions than they answer. Until a few months ago, 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 year searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 28 bursts, two of which have been localised to host galaxies at redshifts > 0.3. These bursts and their hosts are very unlike the repeater, suggesting there may be a dichotomy in the population. Over the next six months we expect to detect another 12 FRBs, which will also have sub-arcsecond localisations. Here we propose to search this population for repeats. 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, will either confirm the presence of additional repeating FRBs or the uniqueness of FRB 121102 amongst the population.

快速射电暴（Fast Radio Bursts, FRBs）所引发的疑问远多于其给出的答案。直至数月前，人类仅发现一例已知会重复的快速射电暴，并将其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，要么为脉冲星风云星云）。过去一年间，借助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28次射电暴，其中两例已被精准定位至红移大于0.3的宿主星系。此次探测到的射电暴及其宿主星系与该重复暴特征差异显著，暗示该类暴的种群或存在二分性差异。未来六个月内，我们预计将再探测到12次快速射电暴，且均可实现亚角秒级定位。在此我们提出研究计划：对该种群开展重复暴搜寻工作。我们将依托完备的样本集，以及对已精准定位射电暴开展的高密度监测计划——该监测的能流阈值较此前探测阈值低60倍以上——要么证实存在更多可重复快速射电暴，要么确认FRB 121102在该种群中的独特性。