A lower bound on the number of cosmic ray events required to measure source catalogue correlations

Marco Dolci, Andrew Romero-Wolf, Stephanie Wissel
2016 Journal of Cosmology and Astroparticle Physics  
Recent analyses of cosmic ray arrival directions have resulted in evidence for a positive correlation with active galactic nuclei positions that has weak significance against an isotropic source distribution. In this paper, we explore the sample size needed to measure a highly statistically significant correlation to a parent source catalogue. We compare several scenarios for the directional scattering of ultra-high energy cosmic rays given our current knowledge of the galactic and
more » ... magnetic fields. We find significant correlations are possible for a sample of >1000 cosmic ray protons with energies above 60 EeV.
doi:10.1088/1475-7516/2016/10/028 fatcat:myofg4xaezaifhgnweuhwcr7xi