论文标题

宇宙射线电子和正电子通量中可能破裂的含义

Implications of a possible TeV break in the cosmic-ray electron and positron flux

论文作者

Ding, Yu-Chen, Li, Nan, Wei, Chun-Cheng, Wu, Yue-Liang, Zhou, Yu-Feng

论文摘要

H.E.S.S.观察到了宇宙射线电子和正电子(CRES)的TEV光谱中断宇宙射线电子和正电子(CRE)(CRES)(CRES),从$ \ sim 3 $ 3 $变为$ \ sim 3 $ 4 $ 4 $。最近由Dampe确认,高意义为$ 6.6〜σ $。这样的观察显然与其他实验(例如费米LAT,AMS-02和Calet)的数据不一致。我们对最新的CRE数据进行了全球分析,包括Fermi-Lat,AMS-02,Calet,Dampe和H.E.S.S.考虑到能量尺度的不确定性,以提高数据集之间的一致性。拟合结果极有利于$ \ sim 1 $ tev的休息存在,其统计意义更高,为$ 13.3〜σ $。鉴于暂定的CRE断裂,我们重新访问了许多附近来源的模型,例如单个通用的脉冲星云(PWN),来自ATNF目录中已知的多个pwne,以及它们与其他深色物质(DM)组件或超级nova Remnant(SNR)的组合。我们表明,CRE在$ \ sim 1 $ tev处断裂,以及已知的Cr Positron多余点,即附近来源应高度不对称的可能性。在正在考虑的模型中,具有PWN Plus SNR的模型受到当前数据最有利的。 PWN和SNR来源的偏爱距离和年龄分别在$ 0.6 $ kpc和$ 10^{5} $ yr左右。可能的候选资源包括PSR J0954-5430,Vela和Monogem Ring等。我们发现,对于所考虑的模型,额外的DM组件是不必要的,或者预测H.E.S.S.的紧张张力过多的光子过多的光子。从银河中心的方向的数据$γ$。我们还表明,在CRE到达方向上各向异性的当前测量值可用于确定源的性质。

A TeV spectral break in the total flux of cosmic-ray electrons and positrons (CREs) at which the spectral power index softens from $\sim 3$ to $\sim 4$ has been observed by H.E.S.S. and recently confirmed by DAMPE with a high significance of $6.6~σ$. Such an observation is apparently inconsistent with the data from other experiments such as Fermi-LAT, AMS-02 and CALET. We perform a global analysis to the latest CRE data including Fermi-LAT, AMS-02, CALET, DAMPE and H.E.S.S. with energy scale uncertainties taken into account to improve the consistency between the data sets. The fit result strongly favors the existence of the break at $\sim 1$ TeV with an even higher statistical significance of $13.3~σ$. In view of the tentative CRE break, we revisit a number of models of nearby sources, such as a single generic Pulsar Wind Nebula (PWN), known multiple PWNe from the ATNF catalog, and their combinations with either an additional Dark Matter (DM) component or a Supernova Remnant (SNR). We show that the CRE break at $\sim 1$ TeV, together with the known CR positron excess points towards the possibility that the nearby sources should be highly charge asymmetric. Among the models under consideration, the one with a PWN plus SNR is most favored by the current data. The favoured distance and age of the PWN and SNR sources are both within $0.6$ kpc and around $10^{5}$ yr respectively. Possible candidate sources include PSR J0954-5430, Vela and Monogem ring, etc. We find that for the models under consideration, the additional DM component is either unnecessary, or predicts too much photons in tension with the H.E.S.S. data of $γ$-rays from the direction of the Galactic Center. We also show that the current measurement of the anisotropies in the arrival direction of the CRE can be useful in determining the property of the sources.

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