The case for the existence of intermediate-mass black holes, hundreds to thousands of times more massive than our Sun, has received a major boost — with implications for gravitational waves and clustered star formation.
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Miller, M. A happy medium. Nature Phys 5, 537–538 (2009). https://doi.org/10.1038/nphys1356
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DOI: https://doi.org/10.1038/nphys1356
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