Anisotropy studies of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory

Collaboration
Jan 15, 2024
5 pages
Published in:
  • PoS TAUP2023 (2024) 136
Contribution to:
  • Published: Jan 15, 2024
Experiments:

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Abstract: (SISSA)
Measurements of anisotropic arrival directions of ultra-high-energy cosmic rays provide important information for identifying their sources. On large scales, cosmic rays with energies above 8EeV8 \, \mathrm{EeV} reveal a dipolar flux modulation in right ascension with a significance of 6.9σ6.9\sigma, with the dipole direction pointing 113113^\circ away from the Galactic center. This observation is explained by extragalactic origins. Also, model-independent searches for small- and intermediate-scale overdensities have been performed in order to unveil astrophysically interesting regions. On these scales, no statistically significant features could be detected. However, intermediate-scale analyses comparing the measured arrival directions with potential source catalogs show indications for a coincidence of the measured arrival directions with catalogs of starburst galaxies and the Centaurus~A region.In this contribution, an overview of the studies regarding anisotropies of the arrival directions of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory on different angular scales is presented and the current results are discussed.
  • cosmic radiation: UHE
  • anisotropy
  • observatory
  • Auger
  • galaxy
  • modulation
  • dipole
  • flux