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arXiv 2005.08782astro-ph.HEastro-ph.COastro-ph.GA
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Pierre Auger天文台2 MRS星系与UHECR通量的互相关

Cross-correlating 2MRS galaxies with UHECR flux from Pierre Auger Observatory

Pavel Motloch

摘要:

利用互相关功率谱技术研究了俄歇天文台的超高能宇宙线(UHERC)通量与2MASS红移巡天星系之间的关系。使用一个简单的线性偏置模型相对于星系的自动功率谱,我们能够约束的偏差值小于1%的UHECR与能量4 EeV-8 EeV,小于2.3%的UHECR与能量以上8 EeV和小于21%的UHECR与能量以上52 EeV(所有95%的置信限)。我们研究了偏倚的能量依赖性,但小样本量不允许我们得出任何统计学显著性结论。对于52 EeV以上的宇宙线事件,我们发现了一个奇怪的多余的交叉相关在$\sim 1^\circ$度尺度。考虑到类似的互相关在更大的角度尺度上是不可见的,统计波动似乎是最合理的解释。

英文摘要:

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.

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