Clustering of ultra-high energy cosmic ray arrival directions on medium scales

2005/12/31 by M. Kachelriess, M. Kachelrieß, D. Semikoz +1 · 2 citations
Physics and Astronomy · #Astrophysics and Cosmic Phenomena #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #astro-ph

paper · pdf · doi:10.1016/j.astropartphys.2006.04.006

published as Astropart.Phys.26:10-15,2006 · 12 pages, 5 figures; v2: added discussion of penalty factor and experimental exposures

arxiv created 2006/03/15 · openalex publication_date 2006/06/12 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

The two-point autocorrelation function of ultra-high energy cosmic ray (UHECR) arrival directions has a broad maximum around 25 degrees, combining the data with energies above 4× 10¹⁹ eV (in the HiRes energy scale) of the HiRes stereo, AGASA, Yakutsk and SUGAR experiments. This signal is not or only marginally present analyzing events of a single experiment, but becomes significant when data from several experiments are added. Both the energy dependence of the signal and its angular scale might be interpreted as first signatures of the large-scale structure of UHECR sources and of intervening magnetic fields.

Citations

• A comparative study of correlations between arrival directions of ultra-high-energy cosmic rays and positions of their potential astrophysical sources

Cited by

• UHECR observations and lensing in the magnetic field of the Virgo cluster
• Testing large-scale (an)isotropy of ultra-high energy cosmic rays