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arXiv 0812.4851astro-phhep-ph
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具有类暗物质光谱的Cosmic-Ray正电子的伽马射线暴/脉冲星

A Gamma-Ray Burst/Pulsar for Cosmic-Ray Positrons with a Dark Matter-like Spectrum

Kunihito Ioka

摘要:

我们认为,PAMELA、ATIC/PPB-BETS、Fermi和HESS实验最近观测到的宇宙射线正电子和电子过剩可能是由10^{5-6}年前附近的一个伽马射线暴(GRB)或类似GRB的(古老的、单次的和短寿命的)脉冲星/超新星遗迹/微类星体引起的.我们可以重现平滑的费米/HESS谱以及尖峰ATIC/PPB-BETS谱。光谱有一个类似于暗物质预测的尖锐截止点,有时还有一条线(不类似),因为更高能量的宇宙射线在截止/线能量标记源年龄的地方冷却得更快。一个GRB类天体物理源预计有一个小的,但有限的传播在截止/线,以及各向异性的宇宙射线和扩散伽马射线通量,费米和未来的CALET实验提供了一种方法,区分暗物质和天体物理起源。

英文摘要:

We propose that a nearby gamma-ray burst (GRB) or GRB-like (old, single and short-lived) pulsar/supernova remnant/microquasar about 10^{5-6} years ago may be responsible for the excesses of cosmic-ray positrons and electrons recently observed by the PAMELA, ATIC/PPB-BETS, Fermi and HESS experiments. We can reproduce the smooth Fermi/HESS spectra as well as the spiky ATIC/PPB-BETS spectra. The spectra have a sharp cutoff that is similar to the dark matter predictions, sometimes together with a line (not similar), since higher energy cosmic-rays cool faster where the cutoff/line energy marks the source age. A GRB-like astrophysical source is expected to have a small but finite spread in the cutoff/line as well as anisotropy in the cosmic-ray and diffuse gamma-ray flux, providing a method for the Fermi and future CALET experiments to discriminate between dark matter and astrophysical origins.

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