Search for Large-Scale Anisotropy of Ultrahigh Energy Cosmic Rays with HiRes Stereo Data

We have searched for correlations between the pointing directions of ultrahigh energy cosmic rays in the data of the High Resolution Fly’s Eye (HiRes) collaboration, and local large scale structure. The HiRes stereo data set (the same used to search for AGN correlations [1]) was used in the search, and the 2 Micron All-Sky Redshift Survey (2MRS) was used to determine the density of galaxies in right ascension and declination. The two parameters of the search were the minimum energy of the cosmic rays and the typical mean magnetic deflection angle. Previous searches for extragalactic anisotropy used minimum energies of 10, 40, and 57 EeV. We made those energies, plus choosing to quote a 95% confidence level (if no correlations were found), a priori choices of search parameters, and examined deflection angles from 1 to 15 degrees. The results of the search will be reported.