Fast radio bursts may originate from nearby flaring stars
Fast radio bursts may originate from nearby flaring stars
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DOI：
10.1093/mnrasl/slt177
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发表时间：
2013-10
影响因子：
4.8
通讯作者：
A. Loeb;Y. Shvartzvald;D. Maoz
中科院分区：
文献类型：
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作者：
A. Loeb;Y. Shvartzvald;D. Maoz
最近发现了六个快速射电暴（FRB）。FRB是明亮（~0.1 - 1 Jy）和短暂（~ 1 ms）的射电辐射脉冲，其色散测量（DM）超过银河值，因此FRB被解释为在宇宙学距离上。相反，我们建议，FRB是罕见的爆发的主序恒星在~1千秒差距。而不是将它们的多余DM与星系际介质联系起来，我们将其与它们的宿主恒星周围的日冕等离子体毯联系起来。我们已经监测了三个已知的FRB的无线电波束内的恒星的光学波段。在其中一个视场中，我们发现了一颗明亮的（V=13.6等）变星星（0.2等峰谷），具有主序星G型光谱和周期P = 7.8小时，可能是一颗W-UMa型接触双星。对我们在FRB光束之外的数据的分析表明，在FRB光束内找到这种亮度和振幅的可变星星的概率为5%。在另外两个FRB场中没有发现异常变星。需要进一步的观测来研究附近类似的（<~ 800 pc）恒星是否是FRB的来源。
Six cases of fast radio bursts (FRBs) have recently been discovered. The FRBs are bright (~0.1 - 1 Jy) and brief (~ 1 ms) pulses of radio emission with dispersion measures (DMs) that exceed Galactic values, and hence FRBs have been interpreted to be at cosmological distances. We propose, instead, that FRBs are rare eruptions of flaring main-sequence stars within ~1 kpc. Rather than associating their excess DM with the intergalactic medium, we relate it to a blanket of coronal plasma around their host stars. We have monitored at optical bands the stars within the radio beams of three of the known FRBs. In one field, we find a bright (V=13.6 mag) variable star (0.2 mag peak-to-trough) with a main-sequence G-type spectrum and a period P = 7.8 hr, likely a W-UMa-type contact binary. Analysis of our data outside of the FRB beams indicates a 5% chance probability of finding a variable star of this brightness and amplitude within the FRB beams. We find no unusual variable stars in the other two FRB fields. Further observations are needed to investigate if similar nearby (<~ 800 pc) stars are the sources of FRBs.