Anisotropy Studies Around the Galactic Center at EeV Energies with Auger Data

THE PIERRE AUGER COLLABORATION (AUTOR 384 DE 427); M. J. TUEROS

Pune, India

Conferencia; 29th International Cosmic Ray Conference; 2005

Tata Institute of Fundamental Research

The Pierre Auger Observatory data have been analyzed to search for excesses of events near the direction of the galactic center in several energy ranges around EeV energies. In this region the statistics accumulated by the Observatory are already larger than that of any previous experiment. Using both the data sets from the surface detector and our hybrid data sets (events detected simultaneously by the surface detector and the fluorescence detector) we do not find any significant excess. At our present level of undestanding of the performance and properties of our detector, our results do not support the excesses reported by AGASA and SUGAR experiments. We set an upper bound on the flux of cosmic rays arriving within a few degrees from the galactic center in the energy range from 0.8-3.2 EeV. We also have searched for correlations of cosmic ray arrival directions with the galactic plane and with the super-galactic plane at energies in the range 1-5 EeV andabove 5 EeV and have found no significant excess.