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T: Fachverband Teilchenphysik

T 40: Kosmische Strahlung II

T 40.9: Vortrag

Montag, 29. Februar 2016, 18:50–19:05, VMP9 SR 29

First simultaneous fit of the energy spectrum, mass composition and anisotropy of the Auger/Telescope Array cosmic ray data* — •David Wittkowski and Karl-Heinz Kampert — Bergische Universität Wuppertal

The first detection of ultra-high energy cosmic rays (UHECR, E > 1 EeV) dates back to Linsley (1963), but only very little is currently known about their sources. To obtain information about the sources of UHECR, the Pierre Auger Observatory and the Telescope Array have been detecting the UHECR arriving at Earth for about a decade. The collected data can be compared to corresponding results from simulations of the propagation of UHECR allowing to test assumptions regarding the UHECR sources. In this talk we will report on sophisticated simulations carried out with the Monte-Carlo Code CRPropa 3 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. We carried out such simulations assuming different properties of the UHECR sources (e.g., the density and mass spectrum of the particles at the sources). Based on these simulations, we will present and discuss results from the first simultaneous fit of the energy spectrum, mass composition and anisotropy of the UHECR observed at the Pierre Auger Observatory and Telescope Array. This includes especially the astrophysical scenario with the closest agreement with the current UHECR data.
* Gefördert durch die BMBF-Verbundforschung Astroteilchenphysik