论文标题

附近的SNR:光谱中的多理解剂异常的常见起源,宇宙射线的比率和各向异性

Nearby SNR: a possible common origin to multi-messenger anomalies in spectra, ratios and anisotropy of cosmic rays

论文作者

Qiao, Bing-Qiang, Guo, Yi-Qing, Wei-Liu, Bi, Xiao-Jun

论文摘要

在过去的几年中,观察到了多理智的异常,包括核的光谱硬化或过量的核,瘦素,$ \ bar p/p $和b/c的比率以及各向异性逆转。 AMS-02实验还揭示了在284 GEV和TEV以外的正电子和电子的不同光谱中断。自然要问所有这些异常是否来自一个统一的物理场景。在这项工作中,采用了带有附近SNR源的空间依赖性传播(SDP)来复制上述异常。 SNR周围可能存在密集的分子云(DMC),并且可以通过PP碰撞或加速的原代宇宙射线和DMC之间的碎片产生二次颗粒。结果,可以很好地再现主要,次级粒子和$ b/c $和$ \ bar p/p $比率的光谱硬化。由于源年龄在330 kyrs时的能量损失,从测量值暗示的原代电子的特征光谱中断约为1 TEV。带电乳子的次级正电子和电子从其母亲颗粒中取出$ 5 \%$的能量,因此正电子频谱的截止值为$ \ sim $ 250 GEV。因此,在这种统一的物理情况下,可以实现正电子和电子以及其他异常的不同光谱中断。更有趣的是,我们还可以在5台电视上获得特色结构作为li,be,b的次级粒子的光谱中断,可用于验证我们的模型。我们希望将来的新一代太空传播实验群可以观察到这些标记的结构。

The multi-messenger anomalies, including spectral hardening or excess for nuclei, leptons, ratios of $\bar p/p$ and B/C, and anisotropic reversal, were observed in past years. AMS-02 experiment also revealed different spectral break for positron and electron at 284 GeV and beyond TeV respectively. It is natural to ask whether all those anomalies originate from one unified physical scenario. In this work, the spatially-dependent propagation (SDP) with a nearby SNR source is adopted to reproduce above mentioned anomalies. There possibly exists dense molecular cloud(DMC) around SNRs and the secondary particles can be produced by pp-collision or fragmentation between the accelerated primary cosmic rays and DMC. As a result, the spectral hardening for primary, secondary particles and ratios of $B/C$ and $\bar p/p$ can be well reproduced. Due to the energy loss at source age of 330 kyrs, the characteristic spectral break-off for primary electron is at about 1 TeV hinted from the measurements. The secondary positron and electron from charged pion take up $5\%$ energy from their mother particles, so the positron spectrum has a cut-off at $\sim$250 GeV. Therefore, the different spectral break for positron and electron together with other anomalies can be fulfilled in this unified physical scenario. More interesting is that we also obtain the featured structures as spectral break-off at 5 TV for secondary particles of Li, Be, B, which can be served to verify our model. We hope that those tagged structures can be observed by the new generation of space-borne experiment HERD in future.

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