EHT observations yield a 42 microarcsecond crescent diameter for M87's central source, inferring an angular gravitational radius of 3.8 microarcseconds and black hole mass of 6.5 billion solar masses consistent with a Kerr spacetime.
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First M87 Event Horizon Telescope Results. VI. The Shadow and Mass of the Central Black Hole
EHT observations yield a 42 microarcsecond crescent diameter for M87's central source, inferring an angular gravitational radius of 3.8 microarcseconds and black hole mass of 6.5 billion solar masses consistent with a Kerr spacetime.