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T: Fachverband Teilchenphysik
T 62: Cosmic Rays III
T 62.5: Vortrag
Mittwoch, 18. März 2026, 17:15–17:30, KS 00.006
mw-atlas: Inferring the 3D Galactic cosmic ray density of our Milky Way — •Mareike Berkner1, Torsten Enßlin2, Hanieh Zandinejad2, and Philipp Mertsch1 — 1RWTH Aachen University, Aachen, Germany — 2Max-Planck-Institut für Astrophysik, Garching, Germany
Most models of the Galactic cosmic-ray (CR) distribution often rely on simplified source distributions and propagation scenarios. They consequently fail to capture the rich, non-axisymmetric structure of the Milky Way. The true, 3D distribution of CRs is however crucial in identifying CR sources and in understanding the feedback that CRs provide to the interstellar medium. In this contribution, we discuss methodological attempts for a data-driven reconstruction of the 3D CR density using Bayesian inference and Gaussian processes. Information of the CR density is provided by hadronic γ-rays, measured by Fermi-LAT. Morphological matching structure in the γ-ray sky with corresponding ones in spatially resolved gas maps allows reconstructing the smooth, spatially correlated CR density field, including a measure of its uncertainty. This 3D map can be directly compared to predictions from propagation models. This will enable new tests of CR transport scenarios, improve models of diffuse gamma-ray emission, and offer a starting point for integrating CR physics consistently into ISM analyses.
Keywords: Cosmic Rays; Bayesian Inference; Gaussian Processes; Galactic Diffuse Emissions; Information Field Theory