Implications of a possible TeV break in the cosmic-ray electron and
Implications of a possible TeV break in the cosmic-ray electron and
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宇宙射线电子中可能出现 TeV 断裂的影响
DOI：
10.1103/physrevd.103.115010
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发表时间：
2021
影响因子：
5
通讯作者：
Zhou Yu-Feng
中科院分区：
文献类型：
--
作者：
Ding Yu-Chen;Li Nan;Wei Chun-Cheng;Wu Yue-Liang;Zhou Yu-Feng
H.E.S.S.观测到宇宙线电子和正电子（CREs）总通量中的TeV谱突变，其谱功率指数从到软化。最近被DAMPE证实具有很高的意义。这样的观测结果显然与其他实验（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.，其中考虑了能量尺度的不确定性以提高数据集之间的一致性。拟合结果强烈支持在处存在断裂，具有更高的统计显著性。鉴于CRE的尝试性突破，我们重新审视了附近来源的一些模型，例如单个通用脉冲星风星云（PWN），ATNF目录中已知的多个PWNe，以及它们与额外的暗物质（DM）成分或超新星遗迹（SNR）的组合。我们表明，CRE打破，连同已知的CR正电子过剩，指向附近的来源应该是高度电荷不对称的可能性。在所考虑的模型中，具有PWN加SNR的模型是当前数据最青睐的。PWN和SNR源的有利距离和年龄分别在0.6kpc和0.6kpc左右。可能的候选源包括PSR J0954 - 5430，Vela和Monogem环等。我们发现，对于所考虑的模型，额外的DM组件是不必要的或预测太多的光子发射与H.E.S.S.来自银河系中心方向的射线数据。我们还表明，在CRE的到达方向的各向异性的电流测量可以是有用的，在确定的源的属性。
A TeV spectral break in the total flux of cosmic-ray electrons and positrons (CREs) at which the spectral power index softens fromtohas been observed by H.E.S.S. and recently confirmed by DAMPE with a high significance of. 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 on 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 datasets. The fit result strongly favors the existence of the break atwith an even higher statistical significance of. 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, 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 a SNR is the most favored by the current data. The favored distances and ages of the PWN and SNR sources are both within 0.6 kpc and around, respectively. Possible candidate sources include PSR J0954-5430, Vela and the Monogem ring, etc. We find that for the models under consideration, the additional DM component is either unnecessary or predicts too much photon emission in tension with the H.E.S.S. data of-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 properties of the sources.