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  • Tipo di prodotto / pubblicazione: Articolo in rivista

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

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.

Comments: 28 pages, 11 figures
Subjects: High Energy Astrophysical Phenomena (astro-ph.HE)
Journal reference: Astropart.Phys.34:627-639,2011
DOI: 10.1016/j.astropartphys.2010.12.007