Dip in UHECR spectrum as signature of proton interaction with CMB

被引：175

作者：

Berezinsky, V ^{[1
]}

Gazizov, AZ

Grigorieva, SI

机构：

[1] Ist Nazl Fis Nucl, Lab nazl Gran Sasso, I-67010 Assergi, AQ, Italy

[2] DESY, D-157 Zeuthen, Germany

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

来源：

PHYSICS LETTERS B | 2005年 / 612卷 / 3-4期

基金：

俄罗斯基础研究基金会;

关键词：

ultrahigh energy cosmic rays;

D O I：

10.1016/j.physletb.2005.02.058

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Ultrahigh energy (UHE) extragalactic protons propagating through cosmic microwave radiation (CMB) acquire the spectrum features in the form of the dip, bump (pile-up protons) and the Greisen-Zatsepin-Kuzmin (GZK) cutoff. We have performed the analysis of these features in terms of the modification factor. This analysis is weakly model-dependent, especially in case of the dip. The energy shape of the dip is confirmed by the Akeno-AGASA data with chi(2) = 19.06 for d.o.f. = 17 with two free parameters used for comparison. The agreement with HiRes data is also very good. This is the strong evidence that UHE cosmic rays observed at energies 1 X 10(18)-4 x 10(19) eV are extragalactic protons propagating through CMB. The dip is also present in case of diffusive propagation in magnetic field.. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：147 / 153

页数：7

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