Collective X-ray emission from distant galaxies reveals a hidden population of supermassive black holes. This finding suggests that galaxies and their central black holes have been coevolving since early cosmic times. See Letter p.356
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Vikhlinin, A. Early black holes uncovered. Nature 474, 293–294 (2011). https://doi.org/10.1038/474293a
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DOI: https://doi.org/10.1038/474293a