arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1810.12367astro-ph.HE
收藏

踝关节下方轻质cosmic ray组件的起源

Origin of the light cosmic ray component below the ankle

A. D. Supanitsky, A. Cobos, A. Etchegoyen

摘要:

高能宇宙射线的起源和性质仍然是个谜。然而,由于皮埃尔俄歇天文台和望远镜阵列的观测,在过去几年中取得了相当大的进展。在$10^{18}$ eV以上,观察到的能谱呈现两个特征:在$\sim 10^{18.6}$ eV处的斜率硬化,这被称为踝部,以及在$\sim 10^{19.6}$ eV处的抑制。从实验数据推断的组合物,解释通过使用目前的高能强子相互作用模型,似乎是轻的脚踝以下,显示出一种趋势,以较重的原子核的初级能量值的增加。此外,各向异性的信息是一致的银河系外的起源,这将占主导地位的光谱脚踝以下的光分量。因此,将踝关节解释为银河系和河外成分过渡的模型不受当前数据的青睐。最近,有人提出,这种轻的成分来源于源环境中更高能量和更重的原子核的光致衰变。踝关节的形成也可以用这种机制来解释。在这项工作中,我们详细研究这种一般情况下,但在活动星系的中心区域的背景下。在这种情况下,宇宙射线在这些类型星系中心区域的超大质量黑洞附近被加速,重核的光致蜕变发生在超大质量黑洞周围的辐射场中。

英文摘要:

The origin and nature of the ultrahigh energy cosmic rays remains a mystery. However, considerable progress has been achieved in past years due to observations performed by the Pierre Auger Observatory and Telescope Array. Above $10^{18}$ eV the observed energy spectrum presents two features: a hardening of the slope at $\sim 10^{18.6}$ eV, which is known as the ankle, and a suppression at $\sim 10^{19.6}$ eV. The composition inferred from the experimental data, interpreted by using the current high energy hadronic interaction models, seems to be light below the ankle, showing a trend to heavier nuclei for increasing values of the primary energy. Also, the anisotropy information is consistent with an extragalactic origin of this light component that would dominate the spectrum below the ankle. Therefore, the models that explain the ankle as the transition from the galactic and extragalactic components are disfavored by present data. Recently, it has been proposed that this light component originates from the photodisintegration of more energetic and heavier nuclei in the source environment. The formation of the ankle can also be explained by this mechanism. In this work we study in detail this general scenario but in the context of the central region of active galaxies. In this case, the cosmic rays are accelerated near the supermassive black hole present in the central region of these types of galaxies, and the photodisintegration of heavy nuclei takes place in the radiation field that surrounds the supermassive black hole.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑