Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 46: Cosmic Rays II

T 46.7: Talk

Tuesday, March 16, 2021, 17:30–17:45, Tu

Testing the Pierre Auger Observatory Starburst Galaxy and Active Galactic Nuclei Correlation Result with CRpropa Simulations — •Wilson Namasaka for the Pierre Auger collaboration — Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany.

Intermediate scale anisotropies in the distribution of UHECR arrival directions can be associated with two prominent classes of extragalactic gamma-ray sources detected by Fermi-LAT. In the most recent study, a correlation between the arrival directions of cosmic rays at energies above 38 EeV for starburst galaxies (SBG) and above 39 EeV for active galactic nuclei (AGN) was reported by the Pierre Auger Collaboration with a significance against isotropy at 4.5σ and 3.1σ, respectively. In the study, the observed gamma ray luminosity was used as a proxy for cosmic ray luminosity. The cosmic ray excess models for these sources used an angular smearing parameter to fit the observed arrival direction distribution in an optimization scan. The goal of this research is to investigate the viability of this angular smearing using CRPropa simulation and test whether the results of the Pierre Auger Observatory can be reproduced by the deflections expected due to galactic and extragalactic magnetic fields. For this test, the five strongest gamma-ray sources in both the Fermi-LAT AGN and SBG catalogs have been selected based on flux weight. Simulations of these sources including extragalactic and galactic magnetic fields are hereby discussed. The preliminary angular smearing found in these simulations are presented. *Supported by the DAAD Ref No. 91653888.