The clustering of ultra-high energy cosmic rays and their sources

Details The clustering of ultra-high energy cosmic rays and their sources The clustering of ultra-high energy cosmic rays and their sources

2002-12-23

arxiv.org/abs/astro-ph/0212533v2

Phys.Rev.D67:103005,2003

Astronomy and Astrophysics

Astrophysics

13 pages, 8 figures, version in press at Phys. Rev. D

Scientific paper

10.1103/PhysRevD.67.103005

The sky distribution of cosmic rays with energies above the 'GZK cutoff' holds important clues to their origin. The AGASA data, although consistent with isotropy, shows evidence for small-angle clustering, and it has been argued that such clusters are aligned with BL Lacertae objects, implicating these as sources. It has also been suggested that clusters can arise if the cosmic rays come from the decays of very massive relic particles in the Galactic halo, due to the expected clumping of cold dark matter. We examine these claims and show that both are in fact not justified.

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