Astrophysical interpretation of Pierre Auger Observatory measurements of the UHECR energy spectrum and mass composition

被引：0

作者：

di Matteo, Armando ^{[1
,2
,4
]}

机构：

[1] Univ Aquila, Ist Nazl Fis Nucl, Laquila, Italy

[2] Univ Aquila, Dept Phys & Chem Sci, Laquila, Italy

[3] Observ Pierre Auger, Av San Martin Norte 304, RA-5613 Malargue, Argentina

[4] Univ Libre Bruxelles, Serv Phys Theor, Brussels, Belgium

来源：

RICAP16, 6TH ROMA INTERNATIONAL CONFERENCE ON ASTROPARTICLE PHYSICS | 2017年 / 136卷

关键词：

D O I：

10.1051/epjconf/201713602002

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We present a combined fit of a simple astrophysical model of UHECR sources to both the energy spectrum and mass composition data measured by the Pierre Auger Observatory. The fit has been performed for energies above 5 EeV, i.e. the region of the all-particle spectrum above the so-called "ankle"' feature. The astrophysical model we adopted consists of identical sources uniformly distributed in a comoving volume, where nuclei are accelerated with a rigidity-dependent mechanism. The fit results suggest sources characterized by relatively low maximum injection energies and hard spectral indices. The impact of various systematic uncertainties on the above result is discussed.

引用

页数：4

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