Parkes observations for project P958 semester 2019APRS_63

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）引发的疑问远多于其已被解答的问题。直至数月前，仅一例暴——即目前已知的唯一一例重复快速射电暴——被定位至遥远矮星系内的明亮射电星云（年轻超新星遗迹或脉冲星风星云。在过去一年中，依托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例快速射电暴，其中两例被定位至红移大于0.3的宿主星系。这些暴及其宿主星系与此前的重复快速射电暴差异显著，这暗示该快速射电暴种群或存在二分特性。未来六个月内，我们预计将再探测到12例快速射电暴，这些暴同样将获得亚角秒级的定位精度。本研究拟针对该暴群开展重复暴搜索。我们的完整样本，以及对定位精度优良的暴开展的密集监测计划，其能注量极限比此前探测的极限低60倍以上，这将要么证实存在更多重复快速射电暴，要么验证FRB 121102在该暴群中的唯一性。