Münster 2017 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 60: Kosmische Strahlung 5

T 60.5: Vortrag

Dienstag, 28. März 2017, 17:50–18:05, H 3

Influence of the extragalactic background light and the extragalactic magnetic field on ultra-high-energy cosmic rays* — •David Wittkowski and Karl-Heinz Kampert — Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal

Two of the main unresolved questions in astrophysics concern the origin of ultra-high-energy cosmic rays (UHECR, particle energies ≥ 1  EeV) and the properties of their sources. To address these fundamental questions, the UHECR arriving at Earth are detected and computer simulations are carried out. In this talk we will report on sophisticated simulations of the propagation of UHECR that - in contrast to earlier simulations - take into account deflections of UHECR in cosmic magnetic fields as well as cosmological effects such as the redshift evolution of the photon background and the adiabatic expansion of the universe. Our simulations are performed assuming some recent models for the extragalactic background light (EBL) and for the extragalactic magnetic field (EGMF). Based on these simulations, we will show that the choice of the EBL and EGMF models has a strong influence on the energy spectrum and mass composition of the simulated UHECR and thus on the properties of the UHECR sources deduced by a simultaneous fit of the simulated energy spectrum and mass composition to the UHECR observed at the Pierre Auger Observatory. In addition, we will present predictions for the flux of neutrinos that results from interactions of the UHECR with the photon background. *Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A14PX1)