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.
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页数：4
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