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Journal Articles Astroparticle Physics Year : 2011

Search for First Harmonic Modulation in the Right Ascension Distribution of Cosmic Rays Detected at the Pierre Auger Observatory

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P. Abreu
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M. Aglietta
  • Function : Author
E.J. Ahn
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I.F.M. Albuquerque
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D. Allard
I. Allekotte
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J. Allen
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P. Allison
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J. Alvarez Castillo
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J. Alvarez-Muñiz
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M. Ambrosio
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L. Anchordoqui
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S. Andringa
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T. Anticic
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C. Aramo
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E. Arganda
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F. Arqueros
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H. Asorey
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P. Assis
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M. Ave
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G. Avila
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T. Bäcker
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M. Balzer
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K.B. Barber
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A.F. Barbosa
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R. Bardenet
S.L.C. Barroso
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B. Baughman
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J.J. Beatty
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B.R. Becker
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K.H. Becker
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J.A. Bellido
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S. Benzvi
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X. Bertou
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P.L. Biermann
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F. Blanco
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M. Blanco
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C. Bleve
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H. Blümer
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D. Boncioli
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R. Bonino
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N. Borodai
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W.C. Brown
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R. Bruijn
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A. Bueno
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K.S. Caballero-Mora
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G. Cataldi
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J.A. Chinellato
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Abstract

We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 × 10^17 eV with the surface detector array of the Pierre Auger Observatory, reporting on both the phase and the amplitude measurements of the first harmonic modulation in the right-ascension distribution. Upper limits on the amplitudes are obtained, which provide the most stringent bounds at present, being below 2% at 99% C.L. for EeV energies. We also compare our results to those of previous experiments as well as with some theoretical expectations.

Dates and versions

in2p3-00551804 , version 1 (04-01-2011)

Identifiers

Cite

P. Abreu, M. Aglietta, E.J. Ahn, I.F.M. Albuquerque, D. Allard, et al.. Search for First Harmonic Modulation in the Right Ascension Distribution of Cosmic Rays Detected at the Pierre Auger Observatory. Astroparticle Physics, 2011, 34, pp.627-639. ⟨10.1016/j.astropartphys.2010.12.007⟩. ⟨in2p3-00551804⟩
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