14-16 September 2022
Instituto de Física Teórica UAM-CSIC
Europe/Madrid timezone

Fitting an astrophysical model for the UHECR origin

14 Sep 2022, 14:30
IFT, Sala Roja (red room)

IFT, Sala Roja (red room)


Teresa Bister (RWTH Aachen University)


Three observables of ultra-high-energy cosmic rays can be measured with present-day observatories: the energy spectrum, the distribution of maximum shower depths and the arrival directions. We use all three observables for a combined fit, in which the parameters of possible UHECR sources are constrained. The astrophysical model used in this fit is based on 1-dimensional CRPropa3 simulations, taking into account all known interactions. Then, these 1-dimensional simulations are reweighted to account for the three-dimensional source setup consisting of homogeneous background sources and a variable contribution from nearby source candidates. The signal fraction, as well as the size of a rigidity-dependent local magnetic field blurring, are part of the fit parameters. The influence of the extragalactic magnetic field is investigated, considering the low-energy suppression due to diffusion, as well as a source-distance-dependent beam-widening of the arrival directions.

Primary authors

Teresa Bister (RWTH Aachen University) Josina Schulte (RWTH Aachen University) Prof. Martin Erdmann (RWTH Aachen University)

Presentation Materials

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