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Type: Journal article
Title: Search for first harmonic modulation in the right ascension distribution of cosmic rays detected at the Pierre Auger Observatory
Author: Barber, K.
Bellido Caceres, J.
Clay, R.
Cooper, M.
Dawson, B.
Herve, A.
Holmes, V.
Sorokin, J.
Wahrlich, P.
Whelan, B.
Winnick, M.
Citation: Astroparticle Physics, 2011; 34(8):627-639
Publisher: Elsevier Science BV
Issue Date: 2011
ISSN: 0927-6505
Statement of
P. Abreu... K.B. Barber... J.A. Bellido Caceres... R.W. Clay... M.J. Cooper... B.R. Dawson... A.E. Herve... V.C. Holmes... J. Sorokin... P. Wahrlich... B.J. Whelan... M.G. Winnick... et al.
Abstract: We present the results of searches for dipolar-type anisotropies in different energy ranges above 2.5 × 1017 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. © 2011 Published by Elsevier B.V.
Rights: © 2011 Elsevier B.V. All rights reserved.
DOI: 10.1016/j.astropartphys.2010.12.007
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