Testing the declination dependency of the spectrum measured by the Pierre Auger Observatory
D. Ravignani*  on behalf of the Pierre Auger Collaboration
*: corresponding author
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Pre-published on: March 21, 2025
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Abstract
The distribution of the arrival directions of cosmic rays observed by the Pierre Auger Observatory has a dipolar component that implies a flux dependence on declination. Previously, we showed that the spectrum built from events arriving with a zenith angle less than 60° is qualitatively consistent with the dipole. In this work, we go one step further and show that the Auger spectrum cannot reject the hypothesis of a declination-independent flux. By using events of up 80°, we extend the previous survey from +25° of declination to +45°, thus covering 85% of the sky.
DOI: https://doi.org/10.22323/1.484.0038
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