Parkes observations for project P958 semester 2019APRS_65

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）所引发的疑问始终多于其能解答的问题。直至数月前，仅有一种爆发——即目前已知唯一会重复的快速射电暴——被定位至遥远矮星系中的明亮射电星云（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，依托澳大利亚平方千米阵列探路者（ASKAP）开展的巡天探测已发现28次快速射电暴，其中2次已被精准定位至红移大于0.3的宿主星系。这些快速射电暴及其宿主星系与该重复暴截然不同，这暗示其爆发群体或存在二分性。未来六个月内，我们预计将再探测到12次快速射电暴，且这些爆发同样将具备亚角秒级的定位精度。在此我们提议针对该爆发群体开展重复暴搜寻工作。我们的完整样本以及针对定位精度优异的快速射电暴开展的密集监测计划，其能流密度阈值较此前探测阈值低60倍以上，这将要么证实存在额外的重复快速射电暴，要么确认FRB 121102在该爆发群体中的独特性。