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arXiv 1608.05099astro-ph.HE
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搜寻与在IceCube观测到的地外中微子相关的宇宙射线的路线图

A roadmap for searching cosmic rays correlated with the extraterrestrial neutrinos seen at IceCube

Jose Carpio, A. M. Gago

摘要:

我们已经建立了一个天空地图,它应该是预期的120 EeV的宇宙射线宇宙射线(UHECR)的到来方向与最新的天体物理中微子轨道在冰立方,这是作为点源观察到的。为了计算这些到达方向,我们考虑了银河系和河外磁场对宇宙射线偏转的贡献,以及与当前预期兼容的UHECR成分。我们采用Jansson-Farrar JF 12模型计算银河磁场,河外磁场强度为1 nG,相干长度为1 Mpc。我们观察到,银河系平面以外的区域与中微子轨道的相关性更强,而不是邻近或其中的区域,前者是寻找UHECR通量过度或各向异性的良好候选者。此外,作为一个例子,我们集中在150 EeV的UHECR到达方向的区域,该区域与位于北半球远离银道面的$(l,b)=(-137.1^\circ,65.8^\circ)$的冰立方事件37相关,得到了角大小$\sim 5^\circ$,对于200 EeV为$\sim 3^\circ$,对于120 EeV为$\sim 8^\circ$。本文提出的结果代表了一个有用的UHECR过量搜索天空地图指南。

英文摘要:

We have built regions in a Sky map where it should be expected the arrival of 120 EeV ultrahigh energy cosmic rays (UHECR) directionally correlated with the latest astrophysical neutrino tracks observed at IceCube, which are taken as point sources. In order to calculate these arrival directions we have considered contributions to the cosmic rays deflections originated by the galactic and the extragalactic magnetic field, and a UHECR composition compatible with the current expectations. We have used the Jansson-Farrar JF12 model for the Galactic magnetic field and an extragalactic magnetic field strength of 1nG and coherence length of 1Mpc. We observe that the regions outside of the Galactic plane are more strongly correlated with the neutrino tracks than those adjacent to or in it, with the former regions being good candidates to search for excesses, or anisotropies, in the UHECR flux. Additionally, we have focused, as an example, on the region of 150 EeV UHECR arrival directions correlated with the IceCube event 37 located at $(l,b)=(-137.1^\circ,65.8^\circ)$ in the Northern Hemisphere, far away from the Galactic plane, obtaining an angular size $\sim 5^\circ$, being $\sim 3^\circ$ for 200 EeV, and $\sim 8^\circ$ for 120 EeV. The results presented in this paper represent a useful UHECR excess search Sky map guide.

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。

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