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Indication of a mass-dependent anisotropy above 1018.7 eV in the hybrid data of the Pierre Auger Observatory

par Mayotte, Eric;Gonzalez, Nicolas Martin ;Maris, Ioana Codrina ;Suarez-Duran, Mauricio ;Zapparrata, Orazio ; [et al.]
Référence Pos proceedings of science, 395, 321
Publication Publié, 2022-03-18

Article révisé par les pairs

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Résumé :

We test the hypothesis of an anisotropy laying along the galactic plane which depends on the mass of primary cosmic-rays. The sensitivity to primary mass is provided by the depth of shower maximum, Xmax, from hybrid events measured at the Pierre Auger Observatory. The 14 years of available data are split into on- and off-plane regions using the galactic latitude of each event to form two distributions in Xmax, which are compared using the Anderson-Darling 2-samples test. A scan over a subset of the data is used to select an optimal threshold energy of 1018.7 eV and a galactic latitude splitting at