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Accreting black holes follow a Fundamental Plane (FP) linking radio and X-ray luminosities to black hole mass, but whether this relation changes in the ultramassive regime, above $\sim10^{10}\,\Msun$, remains unresolved. Brightest cluster galaxies (BCGs) provide the most direct access to this regime, although earlier claims of enhanced radio emission relied largely on heterogeneous nuclear measurements and black hole masses inferred from host-galaxy proxies.
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