Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-01-13
J.Phys.Conf.Ser.120:062002,2008
Astronomy and Astrophysics
Astrophysics
9 pages, 8 figures, Invited paper presented at TAUP 2007 (Sendai, Japan), to appear in Journal of Physics
Scientific paper
10.1088/1742-6596/120/6/062002
The year 2007 has furnished us with outstanding results about the origin of the most energetic cosmic rays: a flux suppression as expected from the GZK-effect has been observed in the data of the HiRes and Auger experiments and correlations between the positions of nearby AGN and the arrival directions of trans-GZK events have been observed by the Pierre Auger Observatory. The latter finding marks the beginning of ultra high-energy cosmic ray astronomy and is considered a major breakthrough starting to shed first light onto the sources of the most extreme particles in nature. This report summarizes those observations and includes other major advances of the field, mostly presented at the 30th International Cosmic Ray Conference held in Merida, Mexico, in July 2007. With increasing statistics becoming available from current and even terminated experiments, systematic differences amongst different experiments and techniques can be studied in detail which is hoped to improve our understanding of experimental techniques and their limitations.
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