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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Repeating and non-repeating fast radio bursts from binary neutron star mergers
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Repeating and non-repeating fast radio bursts from binary neutron star mergers

机译：重复和非重复的快速无线电突发来自二元中子星兼并

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Most fast radio bursts (FRB) do not show evidence of repetition, and such non-repeating FRBs may be produced at the time of a merger of binary neutron stars (BNS), provided that the BNS merger rate is close to the high end of the currently possible range. However, the merger environment is polluted by dynamical ejecta, which may prohibit the radio signal from propagating. We examine this by using a general-relativistic simulation of a BNS merger, and show that the ejecta appears about 1 ms after the rotation speed of the merged star becomes the maximum. Therefore there is a time window in which an FRB signal can reach outside, and the short duration of non-repeating FRBs can be explained by screening after ejecta formation. A fraction of BNS mergers may leave a rapidly rotating and stable neutron star, and such objects may be the origin of repeating FRBs like FRB 121102. We show that a merger remnant would appear as a repeating FRB on a time scale of similar to 1-10 yr, and expected properties are consistent with the observations of FRB 121102. We construct an FRB rate evolution model that includes these two populations of repeating and non-repeating FRBs from BNS mergers, and show that the detection rate of repeating FRBs relative to non-repeating ones rapidly increases with improving search sensitivity. This may explain why only the repeating FRB 121102 was discovered by the most sensitive FRB search with Arecibo. Several predictions are made, including the appearance of a repeating FRB 1-10 yr after a BNS merger that is localized by gravitational waves and subsequent electromagnetic radiation.
机译：大多数快速的无线电突发（FRB）不显示重复的证据，并且可以在二元中子恒星（BNS）的合并时产生这种不重复FRB，条件是BNS合并速率接近高端目前可能的范围。但是，合并环境被动态喷射器污染，这可能禁止无线电信号传播。我们通过使用BNS合并的一般相对论模拟来检查这一点，并且在合并的星的转速变为最大值之后，Ejecta出现大约1毫秒。因此，存在一个时间窗口，其中FRB信号可以达到外部，并且可以通过在喷射物形成之后通过筛选来解释非重复FRB的短持续时间。 BNS合并的一部分可以留下快速旋转且稳定的中子星，并且这种物体可以是重复FRB的起源，如FRB 121102。我们表明合并残余物将作为重复FRB的时间等级类似于1- 10 YR和预期的性质与FRB 121102的观察结果一致。我们构建了一个FRB速率演化模型，包括来自BNS合并的这两个重复和非重复FRB的群体，并表明重复FRB的检出率相对于非 - 通过提高搜索灵敏度，可快速增加。这可以解释为什么只有与arecibo最敏感的FRB搜索发现的重复FRB 121102。制造几种预测，包括在BNS合并之后重复FRB 1-10 YR的外观，其由重力波和随后的电磁辐射定位。

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