On the anisotropy in the arrival directions of ultra-high-energy cosmic rays

Abstract

We present results of elaborate four-dimensional simulations of the propagation of ultra-high-energy cosmic rays (UHECR), which are based on a realistic astrophysical scenario. The distribution of the arrival directions of the UHECR 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 UHECR with arrival energies above 8 EeV 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.

6 pages, 1 figure

References in corpus (5)

• Observation of a Large-scale Anisotropy in the Arrival Directions of Cosmic Rays above $8\times 10^{18}$ eV
• Indications of Intermediate-Scale Anisotropy of Cosmic Rays with Energy Greater Than 57 EeV in the Northern Sky Measured with the Surface Detector of the Telescope Array Experiment
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• What can be learnt from UHECR anisotropies observations? Paper I : large-scale anisotropies and composition features
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• Scrutinizing FR 0 Radio Galaxies as Ultra-High-Energy Cosmic Ray Source Candidates
• UHECR mass composition at highest energies from anisotropy of their arrival directions
• Measurements and implications of cosmic ray anisotropies from TeV to trans-EeV energies
• Using Deep Learning to Enhance Event Geometry Reconstruction for the Telescope Array Surface Detector
• Predictions for the flux of high-energy cosmogenic neutrinos and the influence of the extragalactic magnetic field
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• Searching for All-Scale Anisotropies in the Arrival Directions of Cosmic Rays above the Ankle
• Combined Fit of Spectrum and Composition for FR0 Radio-galaxy-emitted Ultra-high-energy Cosmic Rays with Resulting Secondary Photons and Neutrinos
• Aspects of astrophysical particle production and beyond the Standard Model phenomenology