Parkes observations for project P958 semester 2018OCTS_27

A major breakthrough in fast radio burst (FRB) astronomy was recently made when the repeating FRB 121102 was localized to sub-arcsecond precision. The bursts were found to originate in a bright radio nebula (hypothesized to be a young supernova remnant or pulsar wind nebulae) in a distant dwarf galaxy. These dwarf galaxies are also preferential hosts to superluminous supernova and long gamma-ray bursts, and it has been therefore suggested that the source of the repeating FRB could be a young highly magnetised neutron star. While an understanding of the repeating FRB is emerging, it is still unclear what relationship it has to the rest of the population. Over the last year searches with the Australian Square Kilometre Array Pathfinder (ASKAP) have detected 26 bursts, and over the next six month will likely detect another 12 FRBs, which will be localized to a few arcseconds. 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 burst, FRB）天文学领域近期取得重大突破：重复快速射电暴FRB 121102的定位精度达到亚角秒级。研究发现，该暴起源于遥远矮星系内的明亮射电星云——该星云被推测为年轻超新星遗迹或脉冲星风云。此类矮星系同时也是超亮超新星与长伽马射线暴的优先宿主星系，因此有学者提出，重复快速射电暴的辐射源可能为年轻强磁化中子星。尽管当前学界对重复快速射电暴的认知正逐步清晰，但目前仍未明确其与快速射电暴其他群体间的关联。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26次暴事件，且未来六个月内或可再探测到12次快速射电暴，这些暴事件的定位精度将达到数角秒级。本研究拟针对该快速射电暴群体开展重复暴搜寻工作。我们将采用覆盖全面的样本，并对精确定位的暴事件实施密集监测计划；本次观测的能流极限较此前探测结果低60倍以上，该研究要么将证实额外重复快速射电暴的存在，要么证明FRB 121102在快速射电暴群体中具有独特性。