PoS - Proceedings of Science
Volume 314 - The European Physical Society Conference on High Energy Physics (EPS-HEP2017) - Astroparticle Physics (Parallel Session). Conveners: Teresa Montaruli; Simona Murgia; Pasquale Serpico. Scientific Secretary: Michele Doro.
Unmasking the ultrahigh-energy cosmic ray origin
L.A. Anchordoqui
Full text: pdf
Pre-published on: October 19, 2017
Published on: March 20, 2018
Abstract
The sharp change in slope of the ultrahigh-energy cosmic ray spectrum around $10^{9.6}~{\rm GeV}$ (the ankle), combined with evidence of a light but extragalactic component near and below the ankle which evolves to intermediate/heavy composition above, has proved
exceedingly challenging to understand theoretically. Recently, we introduced a very general model in which, for a range of source conditions, photo-disintegration of ultrahigh-energy nuclei in the region surrounding the accelerator naturally accounts for the observed spectrum and composition of the entire extragalactic component, which dominates above about $10^{8.5}~{\rm GeV}$. In this communication we review the generalities of the model and show that starburst galaxies provide a compelling source example.
DOI: https://doi.org/10.22323/1.314.0001
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