A Study on Anisotropy in the Arrival Directions of Ultra-High-Energy Cosmic Rays Observed by Pierre Auger Observatory

Abstract

We study the anisotropy in the arrival directions of PAO UHECRs, using the point source correlational angular distance distribution. The result shows that the anisotropy is characterized by one prominent excess region and one void region. The excess region is located near the Centaurus A direction, supporting that the Centaurus A is a promising UHECR source. The void region near the south pole direction may be used to limit the diffuse isotropic background contribution.

8 pages

References in corpus (4)

• Update on the correlation of the highest energy cosmic rays with nearby extragalactic matter
• Centaurus A as a point source of Ultra-High Energy Cosmic Rays
• Revisit of Correlation Analysis between Active Galactic Nuclei and Ultra-High Energy Cosmic Rays
• On the Anisotropy of E0 >= 5.5$\times$1019 eV Cosmic Rays according to Data of the Pierre Auger Collaboration