PoS - Proceedings of Science
Volume 423 - 27th European Cosmic Ray Symposium (ECRS) - Invited highlights
Search for anisotropies in the arrival directions of cosmic rays above 32 EeV from Phase One of the Pierre Auger Observatory
C.ย Galelli* ย on behalf of the Pierre Auger Collaboration
Full text: pdf
Pre-published on: February 15, 2023
Published on: December 14, 2023
The toe of the spectrum of ultra-high energy cosmic rays (UHECRs), above โ‰ˆ50 EeV, is an
extremely interesting region for studying the origins of CRs. The potentially small magnetic
deflections at these energies are coupled with the presence of the flux suppression, which could be
a signature of the maximum acceleration potential of the sources, or could find its explanation in
the interactions of cosmic rays with background photons, effectively limiting the region of interest
in the search for UHECR sources to a relatively small bubble around us. In this talk we present
the latest anisotropy searches carried out by the Pierre Auger Collaboration in the energy range
above 32 EeV. The dataset used is that collected in the phase one of the Observatory between
2004 and 2020, before the AugerPrime upgrade, for a cumulative exposure of 120000 km2 sr yr.
We have conducted both blind, model-independent searches for overdensities, correlation analyses
with astrophysical structures, and cross-correlation studies with catalogs of candidate sources. We
have found evidence for a deviation from isotropy at an angular scale of 25 degrees at the 4๐œŽ level
for UHECRs with energy above 38 EeV.
DOI: https://doi.org/10.22323/1.423.0017
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