Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
Large-scale Cosmic-Ray Anisotropies above 4 EeV Measured by the Pierre Auger Observatory
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DOI：
10.3847/1538-4357/aae689
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发表时间：
2018-08
期刊：
影响因子：
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通讯作者：
A. Aab;P. Abreu;M. Aglietta;I. Albuquerque;J. Albury;I. Allekotte;A. Almela;J. A. Castillo
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文献类型：
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作者：
A. Aab;P. Abreu;M. Aglietta;I. Albuquerque;J. Albury;I. Allekotte;A. Almela;J. A. Castillo
我们提出了一个详细的研究的大尺度各向异性的宇宙线的能量超过4 EeV的测量使用皮埃尔俄歇天文台。对于能量仓[4，8] EeV和E ≥ 8 EeV，最显著的信号是R. A中的偶极调制。在能量高于8EeV时，如先前报道的。在本文中，我们通过将其分为三个能量范围来进一步研究最高能量仓。我们发现，偶极子的振幅增加与能量超过4 EeV。生长符合指数β = 0.79 ± 0.19的幂律。偶极子的方向是一致的，这些各向异性在所有考虑的能量与河外起源。此外，我们还估计了各向异性的四极分量：它们在统计上不显著。我们讨论的背景下，从不同的模型的超高能源和宇宙磁场的分布预测的结果。
We present a detailed study of the large-scale anisotropies of cosmic rays with energies above 4 EeV measured using the Pierre Auger Observatory. For the energy bins [4, 8] EeV and E ≥ 8 EeV, the most significant signal is a dipolar modulation in R.A. at energies above 8 EeV, as previously reported. In this paper we further scrutinize the highest-energy bin by splitting it into three energy ranges. We find that the amplitude of the dipole increases with energy above 4 EeV. The growth can be fitted with a power law with index β = 0.79 ± 0.19. The directions of the dipoles are consistent with an extragalactic origin of these anisotropies at all the energies considered. Additionally, we have estimated the quadrupolar components of the anisotropy: they are not statistically significant. We discuss the results in the context of the predictions from different models for the distribution of ultrahigh-energy sources and cosmic magnetic fields.