Synchrotron X-rays from relativistic electrons confirm an important assumption of diffusive shock acceleration in the supernova remnant Cassiopeia A, but do not provide proof of the acceleration of ions to relativistic energies in supernova remnants.
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Ellison, D. Cosmic-ray acceleration at the limit. Nature Phys 2, 589–590 (2006). https://doi.org/10.1038/nphys401
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DOI: https://doi.org/10.1038/nphys401
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