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arXiv 1504.03312hep-phastro-ph.HE
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AMS-02测量的轻子谱的脉冲星解释

Pulsar interpretation of the lepton spectra measured by AMS-02

Jie Feng, Hong-Hao Zhang

摘要:

AMS-02最近公布了它的轻子谱测量结果。结果表明,正电子分数不再增加以上$\sim$ 200 GeV。本工作的目的是研究过量的正电子分数是由于双光子的可能性。从ATNF星表中可以看出,附近已知的中子星可能是高能正电子的一次正电子源。我们发现年龄为$T\simeq (0.45\sim4.5)\times10^{5}$ yr,距离为$d<0.5$ kpc的谱线可以解释AMS-02的正电子分数在高能区的行为。我们表明,四个源- Geminga,J1741-2054,Monogem和J 0942 -5552 -都能够成为满足所有考虑的物理要求的单一源。我们还讨论了这些高能量$e^{\pm}$来自多个核的可能性。多个正电子的贡献预言了在更高能量下具有某些结构的正电子分数。

英文摘要:

AMS-02 recently published its lepton spectra measurement. The results show that the positron fraction no longer increases above $\sim$200 GeV. The aim of this work is to investigate the possibility that the excess of positron fraction is due to pulsars. Nearby known pulsars from ATNF catalogue are considered as a possible primary positron source of the high energy positrons. We find that the pulsars with age $T\simeq (0.45\sim4.5)\times10^{5}$ yr and distance $d<0.5$ kpc can explain the behavior of positron fraction of AMS-02 in the range of high energy. We show that each of the four pulsars --- Geminga, J1741-2054, Monogem and J0942-5552 --- is able to be a single source satisfying all considered physical requirements. We also discuss the possibility that these high energy $e^{\pm}$ are from multiple pulsars. The multiple pulsars contribution predicts a positron fraction with some structures at higher energies.

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