Anisotropy and chemical composition of ultra-high energy cosmic rays using arrival directions measured by the Pierre Auger Observatory
Creators: name: The Pierre Auger Collaboration
name: Abreu, P.
name: Aglietta, M.
name: Ahn, E. J.
name: Albuquerque, I. F. M.
name: Allard, D.
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name: Allen, J.
name: Allison, P.
name: Castillo, J. Alvarez
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name: Ambrosio, M.
name: Aminaei, A.
name: Anchordoqui, L.
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name: Antičić, T.
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name: Bäcker, T.
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name: Castellina, A.
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name: Cataldi, G.
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name: Cester, R.
name: Chauvin, J.
name: Cheng, S. H.
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name: Conceição, R.
name: Contreras, F.
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name: De Domenico, M.
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name: De Mitri, I.
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Publisher: name: arXiv
Year: 2011
Subjects: subject: High Energy Astrophysical Phenomena (astro-ph.HE)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: The Pierre Auger Collaboration has reported evidence for anisotropy in the distribution of arrival directions of the cosmic rays with energies $E&gt;E_{th}=5.5\times 10^{19}$ eV. These show a correlation with the distribution of nearby extragalactic objects, including an apparent excess around the direction of Centaurus A. If the particles responsible for these excesses at $E&gt;E_{th}$ are heavy nuclei with charge $Z$, the proton component of the sources should lead to excesses in the same regions at energies $E/Z$. We here report the lack of anisotropies in these directions at energies above $E_{th}/Z$ (for illustrative values of $Z=6,\ 13,\ 26$). If the anisotropies above $E_{th}$ are due to nuclei with charge $Z$, and under reasonable assumptions about the acceleration process, these observations imply stringent constraints on the allowed proton fraction at the lower energies.