Anisotropy studies of ultra-high-energy cosmic rays measured at the Pierre Auger Observatory
Jan 15, 20245 pages
Published in:
- PoS TAUP2023 (2024) 136
Contribution to:
- , 136
- TAUP 2023
- Published: Jan 15, 2024
DOI:
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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 reveal a dipolar flux modulation in right ascension with a significance of , with the dipole direction pointing 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
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