Parkes observations for project P958 semester 2019APRS_29

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）所引发的疑问始终远超其所能解答的范畴。直至数月之前，人类仅确认一例可重复的快速射电暴——这也是目前已知唯一一例重复暴——其定位结果显示它位于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）内。过去一年间，借助澳大利亚平方千米阵探路者（Australian Square Kilometre Array Pathfinder，ASKAP）开展的巡天探测共发现28例快速射电暴，其中两例的宿主星系红移量大于0.3。此类射电暴及其宿主星系与首例重复暴的特征差异显著，这暗示快速射电暴群体或许存在两类截然不同的子类。未来六个月内，我们预计将再探测到12例快速射电暴，且均将实现亚角秒级定位。本研究计划针对该群体开展重复暴巡天搜寻。依托我们的完整样本，以及对已精确定位的射电暴开展的密集监测计划（本次监测的能流极限较此前探测阈值低60倍以上），我们将要么确认存在更多可重复快速射电暴，要么证明FRB 121102是该群体中独一无二的存在。