Active galactic nuclei are firm favourites to be revealed as the source of cosmic rays, but solid evidence has proven elusive. A model taking both local and global nuclei propagation into account may help to close the deal.
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Becker Tjus, J. Cosmic-ray tracing. Nature Phys 14, 333–334 (2018). https://doi.org/10.1038/s41567-018-0044-9
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DOI: https://doi.org/10.1038/s41567-018-0044-9