Parkes observations for project P958 semester 2019APRS_58

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. \r\nOver 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）相关研究引发的疑问往往远超其所能解答的范畴。直至数月前，人类仅发现一例已知可重复的快速射电暴，并将其定位至遥远矮星系内的明亮射电星云——该星云要么为年轻超新星遗迹，要么属于脉冲星风云星云。过去一年间，依托澳大利亚平方千米阵列探路者（Australian Square Kilometre Array Pathfinder，ASKAP）开展的巡天观测已探测到28例快速射电暴，其中两例已被定位至红移值大于0.3的宿主星系。这些射电暴及其宿主星系与首例可重复暴的特征差异显著，暗示快速射电暴种群或存在二分性。未来六个月内，我们预计将再探测到12例快速射电暴，且这些暴源同样可实现亚角秒级定位。本研究拟针对该种群开展重复暴搜寻工作。我们的完整样本与针对精确定位暴源开展的高密度监测计划，其能流探测极限较此前的观测低60倍以上，将要么证实存在更多可重复快速射电暴，要么验证FRB 121102在快速射电暴种群中的独特性。