First harmonic analysis of the right ascension distribution of cosmic rays detected at the Pierre Auger Observatory

THE PIERRE AUGER COLLABORATION (AUTOR 434 DE 474); M. TUEROS (COAUTOR)

Beijing

Conferencia; 32nd International Cosmic Ray Conference 2011; 2011

Institute of High Energy Physics, Chinese Academy of Sciences

We present an update of the results of searches for first harmonic modulations in the right ascension distribution of cosmic rays detected with the surface detector of the Pierre Auger Observatory over a range of energies. The upper limits obtained provide the most stringent bounds at present above 2.5 × 1017 eV. The infill surface detector array which is now operating at the Pierre Auger Observatory will allow us to extend this search for large scale anisotropies to lower energy thresholds.