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GZK photons in the minimal ultra-high energy cosmic rays model
Gelmini G., Kalashev O., Semikoz D.V.
Astroparticle Physics 28 (2007) 390-396 - http://hal.archives-ouvertes.fr/hal-00713245
Physique/Astrophysique/Phénomènes cosmiques de haute energie
Planète et Univers/Astrophysique/Phénomènes cosmiques de haute energie
GZK photons in the minimal ultra-high energy cosmic rays model
G. Gelmini1, O. Kalashev2, D.V. Semikoz2, 3
1 :  Department of Physics and Astronomy UCLA
University of California, Los Angeles
UCLA, Los Angeles, CA 90095-1547, USA
2 :  INR - Institute for Nuclear Research
Russian Academy of Science
60th October Anniversary Prospect 7a 117312 Moscow
Russie, Fédération De
3 :  APC - UMR 7164 - AstroParticule et Cosmologie
CNRS : UMR7164 – IN2P3 – Observatoire de Paris – Université Paris VII - Paris Diderot – CEA : DSM/IRFU
APC - UMR 7164, Université Paris Diderot, 10 rue Alice Domon et Léonie Duquet, case postale 7020, F-75205 Paris Cedex 13
In a recently proposed model the cosmic rays spectrum at energies above 1018 eV can be fitted with a minimal number of unknown parameters assuming that the extragalactic cosmic rays are only protons with a power law source spectrum ˜E-α and α ≃ 2.6. Within this minimal model, after fitting the observed HiRes spectrum with four parameters (proton injection spectrum power law index and maximum energy, minimum distance to sources and evolution parameter) we compute the flux of ultra-high energy photons due to photon-pion production, the GZK photons, for several radio background models and average extragalactic magnetic fields with amplitude between 10-11 G and 10-9 G. We find the photon fraction to be between 10-4 and 10-3 in cosmic rays at energies above 1019 eV. These small fluxes could only be detected in future experiments like Auger North plus South, EUSO and OWL.

Astroparticle Physics (Astropart. Phys.)
Publisher Elsevier
ISSN 0927-6505 
Articles dans des revues avec comité de lecture

Cosmic rays

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