论文标题
解释带有射电星系的UHECR光谱，组成和大规模各向异性
Explaining the UHECR spectrum, composition and large-scale anisotropies with radio galaxies
论文作者
论文摘要
作为超高能量宇宙射线（UHECRS）的来源，射电星系是有前途的候选人。在这项工作中，我们检查了偶极子和四极管各向异性所施加的严格约束以及UHECR光谱和组成是否允许射频星系是主要的外加层次宇宙射线源。为了计算单个射电星系发出的UHECR通量，我们使用无线电CR相关性和动态演化模型中的信息来限制它们的属性。除了来自单个局部来源的UHECR通量外，我们还包括大部分非本地射电星系发出的弥散通量，这些通量基于其无线电发光分布。分析围绕其预期属性范围内的源参数，我们最终确定了很好地描述UHECR光谱，组成和大规模各向异性的局部源的配置。即使我们仅包括少数本地来源，我们也可以很好地描述所有数据。特别是，我们发现，很少有诸如Fornax A之类的来源和处女座占据脚踝上方的通量占主导地位，而低亮度射线星系贡献了脚踝以下占主导地位的各向同性背景，为数据提供了良好的拟合。
Radio galaxies are promising candidates as the sources of ultrahigh energy cosmic rays (UHECRs). In this work, we examine if the stringent constraints imposed by the dipole and quadropole anisotropies as well as the UHECR spectrum and composition allow that radio galaxies are the dominant extragalactic cosmic ray sources. In order to calculate the UHECR flux emitted by individual radio galaxies, we constrain their properties using information from the radio-CR correlation and a dynamical evolution model. In addition to the UHECR flux from individual, local sources, we include the diffuse flux emitted by the bulk of non-local radio galaxies based on their radio luminosity distribution. Analyzing the source parameters within a range around their expected properties, we finally determine the configurations of local sources describing well the UHECR spectrum, composition and large-scale anisotropies. We obtain a good description of all data even in the case that we include only a small number of local sources. In particular, we find that scenarios where few sources like Fornax A and Virgo A dominate the flux above the ankle, while low-luminosity radio galaxies contribute an isotropic background dominating below the ankle, provide a good fit to the data.
