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arXiv 2007.15321astro-ph.HE
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cosmic-ray光谱硬化的扩散起源揭示了轻子和质子数据中附近源的特征

A diffusive origin for the cosmic-ray spectral hardening reveals signatures of a nearbysource in the leptons and protons data

Ottavio Fornieri, Daniele Gaggero, Daniel Guberman, Loann Brahimi, Alexandre Marcowith

摘要:

在这项工作中,我们的目标是再现,同时,在$\sim 10 \, \mathrm{TeV}$的宇宙射线质子谱的光谱特征,最近报道的DAMPE合作,连同光谱中断在$\sim 1 \, \mathrm{TeV}$测量的H.E.S.S.在轻子谱中。这些特征被解释为附近一个隐藏的宇宙射线加速器的特征。我们表明,这种解释是一致的偶极各向异性的数据,只要刚性缩放的扩散系数的特点硬化在$\sim 200 \, \mathrm{GV}$,建议由AMS-02合作的高精度测量的轻核数据。这种刚性依赖的扩散系数始终适用于大规模的扩散宇宙射线海以及附近的源注入的粒子。

英文摘要:

In this work we aim at reproducing, simultaneously, the spectral feature at $\sim 10 \, \mathrm{TeV}$ in the cosmic-ray proton spectrum, recently reported by the DAMPE Collaboration, together with the spectral break at $\sim 1 \, \mathrm{TeV}$ measured by H.E.S.S. in the lepton spectrum. Those features are interpreted as signatures of one nearby hidden cosmic-ray accelerator. We show that this interpretation is consistent with the dipole-anisotropy data as long as the rigidity scaling of the diffusion coefficient features a hardening at $\sim 200 \, \mathrm{GV}$, as suggested by the light-nuclei data measured with high accuracy by the AMS-02 Collaboration. Such rigidity-dependent diffusion coefficient is applied consistently to the large-scale diffuse cosmic-ray sea as well as to the particles injected by the nearby source.

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