The first event-horizon-scale image of the M87 black hole shows a 42 microarcsecond diameter ring with a central brightness depression, consistent with the shadow of a Kerr black hole.
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The EHT collaboration developed and validated three calibration pipelines for 1.3mm VLBI observations, revealing variability in M87's compact emission.
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First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
The first event-horizon-scale image of the M87 black hole shows a 42 microarcsecond diameter ring with a central brightness depression, consistent with the shadow of a Kerr black hole.
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First M87 Event Horizon Telescope Results. III. Data Processing and Calibration
The EHT collaboration developed and validated three calibration pipelines for 1.3mm VLBI observations, revealing variability in M87's compact emission.