GZK Horizons and the Anisotropy of Highest-energy Cosmic Ray Sources

Details GZK Horizons and the Anisotropy of Highest-energy Cosmic Ray Sources GZK Horizons and the Anisotropy of Highest-energy Cosmic Ray Sources

2008-07-22

arxiv.org/abs/0807.3391v1

Astronomy and Astrophysics

Astrophysics

4 pages, talk presented by C.-C. Lu at Blois 08

Scientific paper

Motivated by recent Pierre Auger result on the correlation of the highest-energy cosmic rays with the nearby active galactic nuclei, we explore possible ultrahigh energy cosmic ray (UHECR) source distributions and their effects on GZK horizons. Effects on GZK horizons by local over-density of UHECR sources are examined carefully with constraints on the degree of local over-density inferred from the measured UHECR spectrum. We include the energy calibration effect on the Pierre Auger data in our studies. We propose possible local over-densities of UHECR sources which are testable in the future cosmic ray astronomy.

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