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arXiv 1503.01670astro-ph.HE
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脉冲星在光谱突变点以上的辐射--一种叠加方法

Pulsar Emission above the Spectral Break - A Stacked Approach

Andrew McCann

摘要:

美国宇航局的费米太空望远镜在发现了150个新的伽马射线源之后,为我们提供了大量新的伽马射线源。所有这些中子星的一个共同特征是它们的光谱能量分布形式,它可以用幂律描述,然后在$\sim$ 1和$\sim$ 8 GeV之间出现光谱突变。普遍的看法是,断裂之后是由辐射/反应限制曲率发射驱动的指数截止。蟹状星云脉冲星是迄今为止发现的唯一一颗能量非常高的脉冲星(E $>$ 100 GeV),它发现的脉冲伽马射线与这种“截止”图像相矛盾。在这里,我们提出了一个新的堆叠分析,平均4.2年的数据,115个卫星发表在第二LAT目录的卫星。这种分析是敏感的低电平$\sim$ 100 GeV的排放,不能解决在个别的电子束,但可以从合奏检测。

英文摘要:

NASA's Fermi space telescope has provided us with a bountiful new population of gamma-ray sources following its discovery of 150 new gamma-ray pulsars. One common feature exhibited by all of these pulsars is the form of their spectral energy distribution, which can be described by a power law followed by a spectral break occurring between $\sim$1 and $\sim$8 GeV. The common wisdom is that the break is followed by an exponential cut-off driven by radiation/reaction-limited curvature emission. The discovery of pulsed gamma rays from the Crab pulsar, the only pulsar so far detected at very high energies (E$>$100GeV), contradicts this "cutoff" picture. Here we present a new stacked analysis with an average of 4.2 years of data on 115 pulsars published in the 2nd LAT catalog of pulsars. This analysis is sensitive to low-level $\sim$100 GeV emission which cannot be resolved in individual pulsars but can be detected from an ensemble.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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