A class of black holes of intermediate mass is expected but has never been detected. The suggestion that these beasts might lurk behind powerful X-ray sources in nearby galaxies is now strengthened.
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NASA/SAO/G. FABBIANO ET AL.
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McCrady, N. The missing black-hole link. Nature 428, 704–705 (2004). https://doi.org/10.1038/428704a
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DOI: https://doi.org/10.1038/428704a
