An upper limit to photons from first data taken by the Pierre Auger Observatory

Details An upper limit to photons from first data taken by the Pierre Auger Observatory An upper limit to photons from first data taken by the Pierre Auger Observatory

2007-01-03

arxiv.org/abs/astro-ph/0701065v1

Astronomy and Astrophysics

Astrophysics

Invited paper presented at the VI. Rencontres du Vietnam, Hanoi, August 2006; 8 pages, 6 figures

Scientific paper

Many models for ultra-high energy cosmic rays postulate exotic scenarios to explain the sources or the nature of these particles. A characteristic feature of these models is the prediction of a significant flux of photons at ultra-high energy. The Pierre Auger Observatory offers a great potential to search for such photons. We present shower observables with sensitivity to photons and the search strategy employed. An upper limit to photon primaries is derived from first Auger data. Prospects for constraining theoretical source models are discussed.

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