In this work, we use low-frequency radio maps to constrain the diffusion properties of cosmic-ray electrons in external galaxies, demonstrating that these data provide a powerful handle on the diffusion coefficient and its spatial and energy dependence. A central novelty of our previous studies is the implementation of fully realistic galactic geometries and proper line-of-sight integration, which we incorporated by modifying and extending existing propagation computational frameworks such as DRAGON and Hermes. This allowed us to construct the first spatially resolved synchrotron templates for the LMC based on 3D source distributions, magnetic-field modeling and correct galactic-plane geometries. These developments showed that accurate modeling cannot rely on simplified radial or Milky-Way-optimized treatments, but instead requires galaxy-specific geometries, rotations, and observational projections. Extending these techniques to additional systems such as M31 will enable a new generation of robust, physically motivated astro-physical background models, which will be crucial for deriving competitive and unbiased dark matter limits in the near future.
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Javier Reynoso Cordova
INFN Napoli
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