Search for patterns by combining cosmic-ray energy and arrival directions at the Pierre Auger Observatory

Abstract

Energy-dependent patterns in the arrival directions of cosmic rays are searched for using data of the Pierre Auger Observatory. We investigate local regions around the highest-energy cosmic rays with $E\ge 6\cdot 10^{19}$ eV by analyzing cosmic rays with energies above $E=5\cdot 10^{18}$ eV arriving within an angular separation of approximately $15°$. We characterize the energy distributions inside these regions by two independent methods, one searching for angular dependence of energy-energy correlations and one searching for collimation of energy along the local system of principal axes of the energy distribution. No significant patterns are found with this analysis. The comparison of these measurements with astrophysical scenarios can therefore be used to obtain constraints on related model parameters such as strength of cosmic-ray deflection and density of point sources.

15 pages, 6 figures, submitted to EPJ C

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• The Galactic Magnetic Field
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• CRT: A numerical tool for propagating ultra-high energy cosmic rays through Galactic magnetic field models
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Cited by in corpus (8)

• Ultra-High-Energy Cosmic Rays: The Intersection of the Cosmic and Energy Frontiers
• UHECR mass composition at highest energies from anisotropy of their arrival directions
• Identification of Patterns in Cosmic-Ray Arrival Directions using Dynamic Graph Convolutional Neural Networks
• Energy Spectrum of Fast Second Order Fermi Accelerators as Sources of Ultra-High-Energy Cosmic Rays
• Search for magnetically-induced signatures in the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory
• On the Measurement of the Helicity of Intergalactic Magnetic Fields Using Ultra-High-Energy Cosmic Rays
• Impact of Galactic magnetic field modelling on searches of point sources via UHECR-Neutrino correlations
• Towards extracting cosmic magnetic field structures from cosmic-ray arrival directions