Speaker
Description
Currently, there is growing evidence of an anisotropic component in the Ultra-High-Energy Cosmic Ray (UHECR) sky with energy greater then a few EeV. However, identifying cosmic accelerators capable of reaching such high energies remains challenging due to interactions with background photons and magnetic deflection caused by cosmic fields (both galactic and extragalactic). Additionally, the strength and spacial structure of the extragalactic magnetic filed (EGMF) are still poorly understood, making the reconstruction of UHECR deflections a non-trivial task. In this study we consider constrained EGMF models within our local Universe to simulate the propagation of UHECRs through such a structured environment. By using the Monte Carlo code CRPropa3, we simulate the propagation, interactions and observation of UHECRs. The deflection of UHECRs within the galactic magnetic field (GMF) is reproduced using a lensing procedure of the UHECR arrival directions at the edge of the galaxy. We consider various combinations of source distributions, EGMF structures and mass compositions to predict the UHECR energy spectrum, mass composition and arrival direction map at Earth. For reference, we also simulate scenarios without the EGMF and with a statistically homogeneous field. We study the feasibility of constraining combinations of source distributions and EGMF models.
