GZK photons in the minimal ultra-high energy cosmic rays model

被引：19

作者：

Gelmini, Graciela ^{[2
]}

Kalashev, Oleg ^{[3
]}

Semikoz, Dmitry V. ^{[1
,3
]}

机构：

[1] APC, F-75205 Paris, France

[2] Univ Calif Los Angeles, Dept Phys & Astron, Los Angeles, CA 90095 USA

[3] Russian Acad Sci, Inst Nucl Res, Moscow 117312, Russia

来源：

ASTROPARTICLE PHYSICS | 2007年 / 28卷 / 4-5期

关键词：

ultra-high energy cosmic rays; photons; UHECR; UHE; UHE photons;

D O I：

10.1016/j.astropartphys.2007.08.006

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

in a recently proposed model the cosmic rays spectrum at energies above 10(18) 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 similar to E-alpha and alpha similar or equal to 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 10(19) eV. These small fluxes could only be detected in future experiments like Auger North plus South, EUSO and OWL. (c) 2007 Elsevier B.V. All rights reserved.

引用

页码：390 / 396

页数：7

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