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Reconciling the ultra-high energy cosmic ray spectrum with Fermi shock acceleration

M. Kachelriess D.V. Semikoz 1
1 APC - THEORIE
APC (UMR_7164) - AstroParticule et Cosmologie, Institut für theoretische Physik
Abstract : The energy spectrum of ultra-high energy cosmic rays (UHECR) is usually calculated for sources with identical properties. Assuming that all sources can accelerate UHECR protons to the same extremely high maximal energy E_max > 10^{20} eV and have the steeply falling injection spectrum 1/E^{2.7}, one can reproduce the measured cosmic ray flux above E > 10^{18} eV. We show that relaxing the assumption of identical sources and using a power-law distribution of their maximal energy allows one to explain the observed UHECR spectrum with the injection 1/E^2 predicted by Fermi shock acceleration.
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Submitted on : Wednesday, January 4, 2006 - 3:43:34 PM
Last modification on : Saturday, September 19, 2020 - 4:51:48 AM

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M. Kachelriess, D.V. Semikoz. Reconciling the ultra-high energy cosmic ray spectrum with Fermi shock acceleration. Physics Letters B, Elsevier, 2006, 634, pp.143-147. ⟨10.1016/j.physletb.2006.01.009⟩. ⟨in2p3-00025292⟩

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