论文标题
通过互相关检测超高的能量宇宙射线各向异性
Detecting ultra-high energy cosmic ray anisotropies through cross-correlations
论文作者
论文摘要
我们提出了一个可观察到的超高能量宇宙射线（UHECR）物理学的可观察到的物理：UHECRS到达方向与星系映射的大规模宇宙结构之间的谐波互相关功能谱。在文献中尚未考虑这种互相关，它允许对主要天体物理成分的直接理论建模。我们描述了交叉相关的预期形式，并显示，如果UHECR源的分布跟踪大规模宇宙结构，则与UHECR自动相关相比，使用当前数据检测可能更容易。此外，互相关对较小的角度尺度上的UHECR各向异性更敏感，对系统的不确定性更健壮，并且可以用来确定UHECR源的红移分布，从而使其成为确定其起源和特性的宝贵工具。
We propose an observable for ultra-high energy cosmic ray (UHECR) physics: the harmonic-space cross-correlation power spectrum between the arrival directions of UHECRs and the large-scale cosmic structure mapped by galaxies. This cross-correlation has not yet been considered in the literature, and it permits a direct theoretical modelling of the main astrophysical components. We describe the expected form of the cross-correlation and show how, if the distribution of UHECR sources trace the large-scale cosmic structure, it could be easier to detect with current data than the UHECR auto-correlation. Moreover, the cross-correlation is more sensitive to UHECR anisotropies on smaller angular scales, more robust to systematic uncertainties, and it could be used to determine the redshift distribution of UHECR sources, making it a valuable tool in determining their origins and properties.
