Parkes observations for project P958 semester 2019APRS_93

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）引发的疑问远多于其已解答的问题。直至数月之前，学界仅确认有一例快速射电暴——即目前已知唯一会重复的暴——被定位于遥远矮星系中的亮射电星云（要么为年轻超新星遗迹，要么为脉冲星风云星云）内。过去一年间，借助澳大利亚平方千米阵探路者（ASKAP）开展的巡天探测共发现28例快速射电暴，其中两例被定位于红移值大于0.3的宿主星系中。这些暴及其宿主星系与此前发现的重复暴特征差异显著，这暗示快速射电暴群体或存在二分性。未来六个月内，我们预计将再探测到12例快速射电暴，且这些暴同样将获得亚角秒级的定位精度。本研究拟针对该暴群体开展重复暴搜寻工作。我们将通过覆盖全面的样本库，以及针对精确定位暴开展的、流量极限较此前探测阈值低60倍以上的高密度监测计划，要么证实存在更多重复快速射电暴，要么确认FRB 121102在快速射电暴群体中的独特性。