Medium-scale anisotropies in the arrival directions of UHECRs observed by the Pierre Auger Observatory

Galelli, C. (2022) Medium-scale anisotropies in the arrival directions of UHECRs observed by the Pierre Auger Observatory. Il nuovo cimento C, 45 (5). pp. 1-4. ISSN 1826-9885

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Abstract

The most prominent obstacle to identifying the sources of UltraHigh-Energy Cosmic Rays (UHECRs) is their incredibly low flux. For this reason, the Pierre Auger Observatory covers an area of ∼3000 km2 and, in its 17 years of operation, has collected over 2600 UHECR events with energies above 32 EeV. In this contribution, I present the search of this dataset for anisotropies on medium scales of a few tenths of degrees in the arrival directions of UHECRs. Evidence for an overdensity in the Centaurus region of the sky is obtained at the 4σ significance level; this evidence is corroborated by a catalog-based likelihood ratio analysis comparing the dataset against the distribution of the closest radiogalaxies and starburst galaxies.

Item Type:	Article
Subjects:	500 Scienze naturali e Matematica > 530 Fisica
Depositing User:	Marina Spanti
Date Deposited:	06 Sep 2022 12:57
Last Modified:	06 Sep 2022 12:57
URI:	http://eprints.bice.rm.cnr.it/id/eprint/22032

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