2011/03/14 by The Pierre Auger Collaboration, P. Abreu, M. Aglietta +466 · 1 citation
Physics and Astronomy · #astro-ph.HE
paper · pdf · doi:10.1016/j.astropartphys.2010.12.007
published as Astropart.Phys.34:627-639,2011 · 28 pages, 11 figures
arxiv created 2011/03/14 · arxiv updated 2015/03/18
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.