Anatomy of a black hole image
A bright, thin ring typically appears in simulated images produced from astrophysical models of M87, arising from the infinite sequence of additional images of the emission region. This feature is superimposed on the more diffuse primary image, produced by the photons that come directly toward Earth. When viewed at the imaging resolution of the Event Horizon Telescope, the two components blur together. However, by separately searching for the thin ring, it is possible to sharpen the view of M87, isolating the fingerprint of strong gravity.
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