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T: Fachverband Teilchenphysik

T 83: Cosmic rays 6

T 83.3: Vortrag

Donnerstag, 7. März 2024, 16:30–16:45, Geb. 20.30: 2.059

The Effects of the Galactic Magnetic Field on the Transition from Galactic to Extragalactic Cosmic Rays — •Veronika Vašíčková and Leonel Morejon for the Pierre-Auger collaboration — Bergische Universität Wuppertal, Gaußstraße 20, 42119 Wuppertal, Germany

Identifying the sources of ultra-high-energy cosmic rays (UHECRs) has been a long-standing task of Astroparticle Physics. Understanding the influence of propagation on the energy spectrum and arrival direction is crucial to identifying UHECR sources and their properties. It has been shown that the Galactic Magnetic Field (GMF) affects UHECRs up to the highest energies.

This contribution highlights how the GMF influences the arrival direction and energy composition of cosmic rays in the rigidity range from 10 PV to 100 EV, whether they originated in the galactic plane or outside the Galaxy. This is accomplished through simulations utilising the CRPropa3 software which includes models of the GMF. A variety of potential sources in the Milky Way as well as starburst galaxies and active galactic nuclei is explored. In addition, the fractions of cosmic rays escaping from the Galaxy due to diffusion is calculated and the residence times of the cosmic rays within the Galaxy are computed. Finally, possible injection spectra which fit the observations of the Pierre Auger Observatory are extracted, given the effects of the GMF.

*Gefördert durch die BMBF Verbundforschung Astroteilchenphysik (Vorhaben 05A23PX1)

Keywords: Cosmic Ray Spectrum; Cosmic Ray Sources; Anisotropy; Galactic Magnetic Field; CRPropa3