最高能量宇宙射线与邻近河外物质相关性的更新
高能天体物理现象
2014-11-21 v2
摘要
皮埃尔·奥格天文台截至2007年8月31日收集的数据显示，能量超过格赖森-扎采平-库兹明能量阈值（eV）的宇宙射线到达方向存在各向异性证据。该各向异性通过到达方向与75 Mpc内活动星系核位置（使用Véron-Cetty和Véron第12版星表）夹角小于的比例来测量。本文报告了截至2009年12月31日记录的、高于相同能量阈值的宇宙射线到达方向比例的更新测量结果。到达方向的数量从27个增加到69个，从而可以进行更精确的测量。相关比例为，而各向同性宇宙射线的预期值为。这低于早期估计的。此外，还研究了扩大的到达方向集与其他邻近河外天体群的关系：2微米全天巡天中的星系以及由雨燕爆发警报望远镜在硬X射线波段探测到的活动星系核。在射电星系半人马座A位置附近的天区，到达方向相对于各向同性预期具有最大的超出。展示了扩大到达方向集的两点自相关函数，并与各向同性预期进行了比较。
引用
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journal= {arXiv preprint arXiv:1009.1855},
year = {2014}
}
备注
Accepted for publication in Astroparticle Physics on 31 August 2010