The black hole photon ring in context
The jet of black hole M87*, the column of magnetic fields and plasma that extends to tens of thousands of lightyears, appears prominently when observed at longer wavelengths (7mm and 3mm), shrinking as the wavelength decreases. At 1.3mm, the wavelength at which the Event Horizon Telescope observed in 2017, the large-scale jet is hardly visible. By separating the ring from the diffuse image, it is now possible to detect the footprints of the jet just outside the event horizon.
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