English

Update on the intermediate arrival-direction analyses of the Pierre Auger Observatory

High Energy Astrophysical Phenomena 2025-07-22 v1 High Energy Physics - Phenomenology

Abstract

We present an update on the arrival-direction analyses conducted on intermediate angular scales using the complete Phase I data of the Pierre Auger Observatory up to the end of 20222022 with a total exposure of 135,000km2sryr135{,}000\,\text{km}^2\,\text{sr}\,\text{yr}. We show the arrival-direction distribution of the ultra-high-energy cosmic rays along the supergalactic plane above 20EeV20\,\text{EeV}, and an update in the search for magnetically-induced signatures in the arrival directions. Furthermore, we present the potential of introducing estimators for the rigidity ordering of the events to enhance arrival-direction analyses on small to intermediate angular scales. To achieve this, we take advantage of two estimators working on the response of the surface detector: an analytical fit based on air-shower universality and a deep neural network.

Keywords

Cite

@article{arxiv.2507.08544,
  title  = {Update on the intermediate arrival-direction analyses of the Pierre Auger Observatory},
  author = {Lorenzo Apollonio},
  journal= {arXiv preprint arXiv:2507.08544},
  year   = {2025}
}

Comments

Presented at the 39th International Cosmic Ray Conference (ICRC 2025). 12 pages, 1 figure