The detection of a tailed radio galaxy in a galaxy cluster conjoined to a region of diffuse radio emission confirms that radio galaxies provide the energetic electrons needed to explain the origin of this enigmatic emission.
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Johnston-Hollitt, M. Galaxy clusters: Radio relics from fossil electrons. Nat Astron 1, 0014 (2017). https://doi.org/10.1038/s41550-016-0014
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DOI: https://doi.org/10.1038/s41550-016-0014
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