论文标题
来自皮埃尔螺旋钻天文台的UHECR通量的交叉相关2MRS星系
Cross-correlating 2MRS galaxies with UHECR flux from Pierre Auger Observatory
论文作者
论文摘要
我们将最近提出的互相关功能谱技术应用于研究皮埃尔螺旋钻天文台的超高能量宇宙射线（UHERC）通量与2粒红移调查的星系之间的关系。使用相对于Galaxy Auto功率谱的简单线性偏差模型，我们能够将偏差的价值限制为EEV 4 EEV -8 EEV的UHECR的偏差小于1％，而UHECR的EEV为2.3％，EEV的uHeCR少于8 EEV，而UHEC在8 EEV中的EEV和uheCR的uheCR少于21％，而UHECR的能源为52 EEV以上EEV（超过52 EEV）。我们研究偏差的能量依赖性，但是小样本量不允许我们得出任何具有统计学意义的结论。对于高于52 EEV的宇宙射线事件，我们发现了$ \ sim 1^\ Circ $度尺度的奇怪多余的交叉相关。给定类似的互相关在较大的角度尺度上看不见，统计波动似乎是最合理的解释。
We apply a recently proposed cross-correlation power spectrum technique to study relationship between the ultra-high energy cosmic ray (UHERC) flux from the Pierre Auger Observatory and galaxies from the 2MASS Redshift Survey. Using a simple linear bias model relative to the galaxy auto power spectrum, we are able to constrain the value of bias to be less than 1% for UHECR with energies 4 EeV - 8 EeV, less than 2.3% for UHECR with energies above 8 EeV and less than 21% for UHECR with energies above 52 EeV (all 95% confidence limit). We study energy dependence of the bias, but the small sample size does not allow us to reach any statistically significant conclusions. For the cosmic ray events above 52 EeV we discover a curious excess cross-correlation at $\sim 1^\circ$ degree scales. Given similar cross-correlation is not visible at larger angular scales, statistical fluctuation seems like the most plausible explanation.
