Heidelberg 2022 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 47: Cosmic Ray 2

T 47.6: Vortrag

Dienstag, 22. März 2022, 17:30–17:45, T-H32

Testing the Starburst Galaxy and Active Galactic Nuclei correlation result for Pierre Auger Observatory with CRPropa simulations* — •wilson namasaka — Bergische Universität Wuppertal, Gaußstr. 20, 42119 Wuppertal, Germany.

Intermediate scale anisotropies in the distribution of Ultra-High Energy Cosmic Rays (UHECRs) arrival directions can be associated with two prominent classes of extragalactic gamma-ray sources detected by Fermi-LAT. In most recent study, a correlation between the arrival direction of cosmic rays at energies above 38 EeV for starburst galaxies (SBG) and 39 EeV for active galactic nuclei (AGN) was reported by the Pierre Auger Collaboration with a significance of 4.5σ and 3.1σ, respectively. 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 viability of this angular smearing using CRPropa is investigated in this research, to test whether the results of the Pierre Auger Observatory can be reproduced by the deflections expected due to magnetic fields. The five strongest gamma-ray sources in both the Fermi-LAT AGN and SBG catalogs based on flux weight have been selected. In this talk, results from the simulations and expected angular deflections shall be presented.

*Funded by DAAD under reference No.91653888.