33ND INTERNATIONAL COSMIC RAY CONFERENCE, RIO DE JANEIRO 2013 THE ASTROPARTICLE PHYSICS CONFERENCE Search for the Large-Scale Cosmic-Ray Anisotropy at 1018 eV with the Telescope Array Surface Detector

Abstract: We report on the search for the large-scale cosmic-ray anisotropy in the energy region between 1018.0 eV and 1018.4 eV in the northern sky, based on the dataset taken during the period between 2008 May and 2012 October with the surface detector of the Telescope Array experiment (TA SD). The number of analyzed air shower events is approximately 1.6 times larger than that of the AGASA observation which claimed the presence of the large-scale anisotropies before. The expected anisotropy map observed by the TA SD is demonstrated using the MC events including the artificial anisotropies assuming the AGASA results. This map shows detectable intensities with the TA SD around the positions of the AGASA anisotropies. We find, however, no such strong excesses or deficit in the actual TA SD data