Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 62: Cosmic Rays III
T 62.7: Talk
Wednesday, March 18, 2026, 17:45–18:00, KS 00.006
Gamma-ray signatures from anisotropic cosmic ray transport in the Milky Way — •Julien Dörner1,2, Jonas Hellrung1,2, Julia Becker Tjus1,2,3, and Horst Fichtner1,2 — 1Theoretical Physics IV, Plasma Astroparticle Physics, Faculty for Physics and Astronomy, Ruhr University Bochum, 44780 Bochum, Germany — 2Ruhr Astroparticle and Plasma Physics Center (RAPP Center), Germany — 3Department of Space, Earth and Environment, Chalmers University of Technology, 412 96 Gothenburg, Sweden
The magnetic field of the Milky Way is composed of a large-scale coherent background and a turbulent component. The spatial diffusion of cosmic rays (CRs) in this composed magnetic field configuration is expected to become anisotropic. The diffusion coefficient along the field line κ∥ is greater than in the degenerated perpendicular directions κ⊥.
In this work, we utilize the open-source framework CRPropa to investigate the anisotropic diffusion of CRs within the Milky Way. We phenomenologically vary the ratio є = κ⊥/ κ∥, ranging from nearly parallel diffusion (є = 10−3) to purely isotropic diffusion (є = 1). The source parameters are optimized to match the observed CR data at Earth. Afterwards, the line-of-sight integration framework HERMES is used to calculate the all-sky gamma-ray emission. Based on the resulting all-sky maps, the feasibility of gamma-ray observations to constrain not only the parameters of such anisotropic transport but also the structure of the Galactic magnetic field will be discussed.
Keywords: Cosmic rays; Gamma Rays; Milky Way; Diffusion