arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2107.08280astro-ph.HE
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来自cosmic-ray与周围介质加速度源相互作用的超高能扩散gamma-ray发射

Ultrahigh-energy diffuse gamma-ray emission from cosmic-ray interactions with medium surrounding acceleration sources

Pei-pei Zhang, Bing-qiang Qiao, Qiang Yuan, Shu-wang Cui, Yi-qing Guo

摘要:

在西藏-AS $γ$实验上首次测量了亚PeV能区的扩散$γ$能谱。它将为理解高能银河系宇宙射线的起源和传播提供新的思路。有人指出,传统的宇宙线传播模型的基础上的低能量测量的新数据不足,和修改的模型与新的成分或替代的传播框架是必要的。在这项工作中,我们提出,强子之间的相互作用的新加速的宇宙射线和周围的源,这是被忽略的传统模型,可以自然地解释西藏-AS $γ$漫发射。我们表明,这种情况下给出了一致的描述,如正电子光谱,硼碳比,和反质子质子比的其他二级物种。结果,10 TeV以上的电子谱将由于该次级分量而具有硬化,这可以通过未来的测量来测试。

英文摘要:

The diffuse $γ$-ray spectrum at sub-PeV energy region has been measured for the first time by the Tibet-AS$γ$ experiment. It will shed new light on the understanding of origin and propagation of Galactic cosmic rays at very high energies. It has been pointed out that the traditional cosmic ray propagation model based on low energy measurements undershoot the new data, and modifications of the model with new ingredients or alternative propagation framework is required. In this work, we propose that the hadronic interactions between freshly accelerated cosmic rays and the medium surrounding the sources, which was neglected in the traditional model, can naturally account for the Tibet-AS$γ$ diffuse emission. We show that this scenario gives a consistent description of other secondary species such as the positron spectrum, the boron-to-carbon ratio, and the antiproton-to-proton ratio. As a result, the electron spectrum above 10 TeV will have a hardening due to this secondary component, which may be tested by future measurements.

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