Radiative efficiency in radio-loud active galactic nuclei is governed by the accretion rate onto the central black hole rather than directly by the type of accreted matter; while it correlates with real differences in host galaxies and environments, it does not provide unambiguous information about particular objects.
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Hardcastle, M. Interpreting radiative efficiency in radio-loud AGNs. Nat Astron 2, 273–274 (2018). https://doi.org/10.1038/s41550-018-0424-1
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DOI: https://doi.org/10.1038/s41550-018-0424-1
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