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

被引：60

作者：

Kachelriess, A ^{[1
]}

Semikoz, DV

机构：

[1] NTNU Trondheim, Inst Fys, N-7491 Trondheim, Norway

[2] Max Planck Inst Phys & Astrophys, Werner Heisenberg Inst, D-80805 Munich, Germany

[3] Coll France, APC, F-75005 Paris, France

[4] RAS, INR, RU-117312 Moscow, Russia

来源：

PHYSICS LETTERS B | 2006年 / 634卷 / 2-3期

关键词：

D O I：

10.1016/j.physletb.2006.01.009

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 greater than or similar to 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-2.2 typically predicted by Fermi shock acceleration. (c) 2006 Published by Elsevier B.V.

引用

页码：143 / 147

页数：5

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