UvA-DARE ( Digital Academic Repository ) Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
UvA-DARE ( Digital Academic Repository ) Fast Radio Burst Discovered in the Arecibo Pulsar ALFA Survey
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发表时间：
2014
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通讯作者：
L. Spitler;J. Cordes;J. Hessels;D. Lorimer;M. McLaughlin;S. Chatterjee;F. Crawford;J. Deneva-
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作者：
L. Spitler;J. Cordes;J. Hessels;D. Lorimer;M. McLaughlin;S. Chatterjee;F. Crawford;J. Deneva-
最近的工作利用脉冲星调查数据，以确定时间上孤立的，毫秒持续时间的无线电爆发与大色散措施（DM）。这些爆发被解释为来自河外源的人口，在这种情况下，他们将提供前所未有的机会，探测星系际介质;他们也可能与新的源类。然而，到目前为止，所有所谓的快速射电暴（FRB）都是用帕克斯射电望远镜及其13波束接收器探测到的，这让人们对这些信号的天体物理性质产生了一些担忧。在这里，我们展示了FRB 121102，这是在帕克斯以外的地理位置发现的第一个FRB。FRB 121102是在1.4 GHz脉冲星阿雷西博L波段馈源阵列（ALFA）的观测中发现的，位于银河系的反中心区域，DM = 557.4 ± 2.0 pc cm−3，脉冲宽度为3.0 ± 0.5 ms，没有星际散射的证据。观测到的信号到达时间随频率的延迟与通过电离介质的色散的预期完全一致。尽管它的银河纬度很低（B = −0.在这条特定的视线上，爆发的最大DM是预期的银河系最大DM的三倍，这表明它来自银河系外。一个特殊的方面的信号是一个倒置的频谱，我们解释这是一个结果被检测到的旁瓣的ALFA接收机。FRB 121102的亮度，持续时间和推断的事件率都与先前检测到的Parkes爆发的属性一致。关键词：电子书：一般线上资料：彩色数字
Recent work has exploited pulsar survey data to identify temporally isolated, millisecond-duration radio bursts with large dispersion measures (DMs). These bursts have been interpreted as arising from a population of extragalactic sources, in which case they would provide unprecedented opportunities for probing the intergalactic medium; they may also be linked to new source classes. Until now, however, all so-called fast radio bursts (FRBs) have been detected with the Parkes radio telescope and its 13-beam receiver, casting some concern about the astrophysical nature of these signals. Here we present FRB 121102, the first FRB discovery from a geographic location other than Parkes. FRB 121102 was found in the Galactic anti-center region in the 1.4 GHz Pulsar Arecibo L-band Feed Array (ALFA) survey with the Arecibo Observatory with a DM = 557.4 ± 2.0 pc cm−3, pulse width of 3.0 ± 0.5 ms, and no evidence of interstellar scattering. The observed delay of the signal arrival time with frequency agrees precisely with the expectation of dispersion through an ionized medium. Despite its low Galactic latitude (b = −0. ◦2), the burst has three times the maximum Galactic DM expected along this particular line of sight, suggesting an extragalactic origin. A peculiar aspect of the signal is an inverted spectrum; we interpret this as a consequence of being detected in a sidelobe of the ALFA receiver. FRB 121102’s brightness, duration, and the inferred event rate are all consistent with the properties of the previously detected Parkes bursts. Key word: pulsars: general Online-only material: color figures