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

Journal article published in 2011 by W. J. M. de Mello Junior, M. Aglietta, M. A. Leigui de Oliveira, Ej J. Ahn, P. And Aglietta M. Ahn E. J. Albuquerque I. F. M. Allard D. Allekotte I. Allen J. Allison P. Alvarez Castillo J. Muñiz J. Ambrosio M. Aminaei A. Anchordoqui L. Andringa S. Antičić T. Aramo C. Arganda E. A. Abreu, W. Rodrigues de Carvalho, Ifm F. M. Albuquerque, D. Allard, I. Allekotte, J. Allen, P. Allison, J. Alvarez Castillo, J. Alvarez-muñiz, M. Ambrosio, A. Aminaei and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present the results of searches for dipolar-type anisotropies in different energy ranges above $2.5\times 10^{17}$ 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. ; Comment: 28 pages, 11 figures