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T: Fachverband Teilchenphysik

T 103: Cosmic rays IV

T 103.4: Vortrag

Freitag, 3. April 2020, 11:45–12:00, L-3.002

Investigation of a Combined Fit Method to Identify a Nearby Cosmic Ray Source — Teresa Bister, Martin Erdmann, •Josina Schulte, and Marcus Wirtz — III. Physikalisches Institut A, RWTH Aachen

The origin of ultra high energy cosmic rays is still unknown and every progress to constrain the physical parameters of the acceleration process at the origin site will help to identify suitable cosmic ray source candidates. The application of a combined fit method to the energy spectrum and shower depth distribution measured by the Pierre Auger Observatory already unveiled information on the spectral index, original elemental composition as well as the maximum cosmic-ray rigidity at the sources. Now, the hypothesis of identical, homogeneously distributed sources is extended by a nearby source with a distance d and a signal fraction f_s using CRPropa 3 simulations to explore the astrophysical scenario in even more detail. In this talk, results of the combined fit method using the extended hypothesis applied on simulated data are presented. In order to develop a reliable analysis, the dependency of the fit results on a wide range of the astrophysical parameters is investigated.