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Article Dans Une Revue The Astrophysical Journal Année : 2015

Large scale distribution of ultra high energy cosmic rays detected at the Pierre Auger Observatory with zenith angles up to 80$^\circ$

A. Aab
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A. Stutz
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Pascal Lautridou
Benoît Revenu
Imen Al Samarai

Résumé

We present the results of an analysis of the large angular scale distribution of the arrival directions of cosmic rays with energy above 4 EeV detected at the Pierre Auger Observatory including for the first time events with zenith angle between $60^\circ$ and $80^\circ$. We perform two Rayleigh analyses, one in the right ascension and one in the azimuth angle distributions, that are sensitive to modulations in right ascension and declination, respectively. The largest departure from isotropy appears in the $E > 8$ EeV energy bin, with an amplitude for the first harmonic in right ascension $r_1^\alpha =(4.4 \pm 1.0){\times}10^{-2}$, that has a chance probability $P(\ge r_1^\alpha)=6.4{\times}10^{-5}$, reinforcing the hint previously reported with vertical events alone.

Dates et versions

in2p3-01088477 , version 1 (28-11-2014)

Identifiants

Citer

A. Aab, M. Avenier, C. Berat, S. Le Coz, D. Lebrun, et al.. Large scale distribution of ultra high energy cosmic rays detected at the Pierre Auger Observatory with zenith angles up to 80$^\circ$. The Astrophysical Journal, 2015, 802 (2), pp.111. ⟨10.1088/0004-637X/802/2/111⟩. ⟨in2p3-01088477⟩
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