A repeating fast radio burst source localized to a nearby spiral galaxy
A repeating fast radio burst source localized to a nearby spiral galaxy
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DOI：
10.1038/s41586-019-1866-z
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发表时间：
2020-01-06
期刊：
影响因子：
64.8
通讯作者：
Zwaniga, A. V.
中科院分区：
文献类型：
--
作者：
Marcote, B.;Nimmo, K.;Zwaniga, A. V.
只有一个重复的快速射电暴被定位在一个不规则的矮星系中;现在另一个被发现来自附近旋涡星系的恒星形成区。快速射电暴（FRB）是短暂、明亮的河外射电闪光（1，2）。它们的物理起源仍然未知，但已经假设了几十种可能的模型（3）。一些FRB源表现出重复爆发（4-7）。虽然已经发现了超过一百个FRB源（8），但只有四个被定位并与宿主星系相关（9-12），并且已知这四个中只有一个发射重复的FRB（9）。宿主星系的性质以及FRB的局部环境可以为它们的物理起源提供重要线索。然而，第一个已知的重复的FRB被定位于低金属量的不规则矮星系，而明显不重复的来源被定位于高金属量的大质量椭圆星系或恒星形成星系，这表明重复和明显不重复的来源可能有不同的物理起源。在这里，我们报告了第二个重复的FRB源（6）FRB 180916.J0158+65的精确定位，它位于附近（红移0.0337 +/- 0.0002）的大质量螺旋星系的恒星形成区，其性质和接近程度使其与所有已知的宿主区别开来。FRB 180916.J0158+65的局部环境与先前定位的单个重复FRB源FRB 121102的局部环境的区别在于，FRB 180916.J0158+65既没有发光的持久射电对应物，也没有高的法拉第旋转测量值（6）。这表明重复的FRB可能具有广泛的光度范围，并且起源于不同的宿主星系和局部环境。
Only one repeating fast radio burst has been localized, to an irregular dwarf galaxy; now another is found to come from a star-forming region of a nearby spiral galaxy.Fast radio bursts (FRBs) are brief, bright, extragalactic radio flashes(1,2). Their physical origin remains unknown, but dozens of possible models have been postulated(3). Some FRB sources exhibit repeat bursts(4-7). Although over a hundred FRB sources have been discovered(8), only four have been localized and associated with a host galaxy(9-12), and just one of these four is known to emit repeating FRBs(9). The properties of the host galaxies, and the local environments of FRBs, could provide important clues about their physical origins. The first known repeating FRB, however, was localized to a low-metallicity, irregular dwarf galaxy, and the apparently non-repeating sources were localized to higher-metallicity, massive elliptical or star-forming galaxies, suggesting that perhaps the repeating and apparently non-repeating sources could have distinct physical origins. Here we report the precise localization of a second repeating FRB source(6), FRB 180916.J0158+65, to a star-forming region in a nearby (redshift 0.0337 +/- 0.0002) massive spiral galaxy, whose properties and proximity distinguish it from all known hosts. The lack of both a comparably luminous persistent radio counterpart and a high Faraday rotation measure(6) further distinguish the local environment of FRB 180916.J0158+65 from that of the single previously localized repeating FRB source, FRB 121102. This suggests that repeating FRBs may have a wide range of luminosities, and originate from diverse host galaxies and local environments.