Dortmund 2021 – scientific programme

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T: Fachverband Teilchenphysik

T 83: Gamma astronomy II

T 83.10: Talk

Thursday, March 18, 2021, 18:20–18:35, Th

Implications of turbulence dependent diffusion on cosmic ray spectra — •Julien Dörner, Julia Tjus, and Patrick Reichherzer — RAPP-Center at Ruhr University Bochum, Bochum, Germany

The propagtion of cosmic rays can be described by diffusive motion in most galactic enviroments. Therfore, a detailed knowlege of the diffusion tensor is necessary. Recent analyses of the energy dependence of the diffusion tensor show a function of the turbulence level b/B, i.e. κ_i ∝ E^γ_i with γ_i = γ_i(b/B), where i∈ {∥, ⊥}. (Reichherzer et al, MNRAS 498:5051-5064 (2020))
In this talk we show the implication of this turbulence-dependent diffusion on the radial dependence of the cosmic-ray spectral index and the transition between parallel and perpendicular component. Finally, we interpret the cosmic-ray gradient detected by Fermi in the light of these findings.