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arXiv 1608.07673astro-ph.HE
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蟹状星云脉冲星巨射电脉冲的宽带谱

Wide-Band Spectra of Giant Radio Pulses from the Crab Pulsar

Ryo Mikami, Katsuaki Asano, Shuta J. Tanaka, Shota Kisaka, Mamoru Sekido, Kazuhiro Takefuji, Hiroshi Takeuchi, Hiroaki Misawa, Fuminori Tsuchiya, Hajime Kita, Y… 展开作者

Ryo Mikami, Katsuaki Asano, Shuta J. Tanaka, Shota Kisaka, Mamoru Sekido, Kazuhiro Takefuji, Hiroshi Takeuchi, Hiroaki Misawa, Fuminori Tsuchiya, Hajime Kita, Yoshinori Yonekura, Toshio Terasawa

摘要:

我们提出的结果,同时观测的巨射电脉冲(GRP)从蟹状星云脉冲星在0.3,1.6,2.2,6.7,和8.4 GHz的四个望远镜在日本。我们得到3194和272 GRP发生在主脉冲和脉冲间阶段,分别。在0.3和8.4 GHz处检测到的几个GRP是有史以来报道的最宽频带的样本。在0.3 ~ 2.2GHz的频率范围内,约70%以上的GRP谱符合单次幂律,谱指数分布在$-4$ ~ $-1$之间。我们还发现,大量的GRP具有这样的硬光谱指数(约$-1$),在0.3 GHz的通量低于检测限(“暗淡硬”GRP)。在0.3 GHz的这种暗硬GRP的光曲线叠加,我们检测到一致的增强相比,关闭GRP的光曲线。我们的样品显示出明显的相关性之间的能量密度和光谱硬度,这表明更有活力的GRP往往表现出较软的光谱。我们对GRP谱的全面研究为在今后的观测中验证快速射电暴的GRP模型提供了有用的材料。

英文摘要:

We present the results of the simultaneous observation of the giant radio pulses (GRPs) from the Crab pulsar at 0.3, 1.6, 2.2, 6.7, and 8.4 GHz with four telescopes in Japan. We obtain 3194 and 272 GRPs occurring at the main pulse and the interpulse phases, respectively. A few GRPs detected at both 0.3 and 8.4 GHz are the most wide-band samples ever reported. In the frequency range from 0.3 to 2.2 GHz, we find that about 70\% or more of the GRP spectra are consistent with single power laws and the spectral indices of them are distributed from $-4$ to $-1$. We also find that a significant number of GRPs have such a hard spectral index (approximately $-1$) that the fluence at 0.3 GHz is below the detection limit ("dim-hard" GRPs). Stacking light curves of such dim-hard GRPs at 0.3 GHz, we detect consistent enhancement compared to the off-GRP light curve. Our samples show apparent correlations between the fluences and the spectral hardness, which indicates that more energetic GRPs tend to show softer spectra. Our comprehensive studies on the GRP spectra are useful materials to verify the GRP model of fast radio bursts in future observations.

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