On the Anisotropy in the Arrival Directions of Ultra-high-energy Cosmic Rays

We present results of elaborate four-dimensional simulations of the propagation of ultra-high-energy cosmic rays (UHECRs), which are based on a realistic astrophysical scenario. The distribution of the arrival directions of the UHECRs is found to have a pronounced dipolar anisotropy and rather weak...

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Bibliographic Details
Published in:Astrophysical journal. Letters 2018-02, Vol.854 (1), p.L3
Main Authors: Wittkowski, David, Kampert, Karl-Heinz
Format: Article
Language:English
Subjects:
Anisotropy
astroparticle physics
Augers
Cosmic rays
Gamma rays
magnetic fields
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Summary:We present results of elaborate four-dimensional simulations of the propagation of ultra-high-energy cosmic rays (UHECRs), which are based on a realistic astrophysical scenario. The distribution of the arrival directions of the UHECRs is found to have a pronounced dipolar anisotropy and rather weak higher-order contributions to the angular power spectrum. This finding agrees well with the recent observation of a dipolar anisotropy for UHECRs with arrival energies above by the Pierre Auger Observatory and constitutes an important prediction for other energy ranges and higher-order angular contributions for which sufficient experimental data are not yet available. Since our astrophysical scenario enables simulations that are completely consistent with the available data, this scenario will be a very useful basis for related future studies.
ISSN:2041-8205
2041-8213
DOI:10.3847/2041-8213/aaa2f9