论文标题
重复快速无线电爆发的精确本地化
PRECISE localizations of repeating Fast Radio Bursts
论文作者
论文摘要
快速无线电爆发(FRB)是极度发光的,短暂的信号(持续时间为毫秒甚至更短)。尽管迄今已发现数百个FRB,但它们的性质仍然不清楚。 FRB的精确定位可以揭示其宿主星系和本地环境,从而阐明导致爆发产生的物理过程。但是,迄今为止,这只有几个FRB才能实现。欧洲VLBI网络(EVN)目前是唯一能够将FRB定位到Milliarcsecond级别的工具。这种精度对于将第一个局部FRB(20121102a)与低金属矮星系中的星形区域相关联至关重要。类似地,发现第二次重复的FRB,20180916b,在附近螺旋星系的杰出星形形成区域的边缘之外。从2019年开始的精确项目(通过EVN菜肴的重复响应来源的精确项目)每年观察到数百个小时,其中一部分EVN望远镜,目的是将Chime/FRB协作发现的重复重复FRB进行定位。精确的最终目标是解开可以生产FRB的环境。在这里,我们介绍了FRB领域的艺术状况,精确的项目以及到目前为止所实现的本地化,它们已经揭示了各种环境,可以发现FRB可以挑战当前模型。
Fast Radio Bursts (FRBs) are extremely luminous and brief signals (with duration of milliseconds or even shorter) of extragalactic origin. Despite the fact that hundreds of FRBs have been discovered to date, their nature still remains unclear. Precise localizations of FRBs can unveil their host galaxies and local environments -- and thus shed light on the physical processes that led to the burst production. However, this has only been achieved for a few FRBs to date. The European VLBI Network (EVN) is currently the only instrument capable of localizing FRBs down to the milliarcsecond level. This level of precision was critical to associate the first localized FRB, 20121102A, to a star-forming region in a low-metallicity dwarf galaxy and physically related it to a compact persistent radio source. Analogously, a second repeating FRB, 20180916B, was found to just outside the edge of a prominent star-forming region of a nearby spiral galaxy. The PRECISE project (Pinpointing REpeating ChIme Sources with EVN dishes), starting from 2019, has observed hundreds of hours per year with a subset of EVN telescopes with the goal of localizing repeating FRBs discovered by the CHIME/FRB Collaboration. The ultimate goal of PRECISE is to disentangling the environments where FRBs can be produced. Here we present the state of the art of the FRB field, the PRECISE project, and the localizations achieved until now, which have unveiled a variety of environments where FRBs can be found that challenges the current models.