In April 2017, the Event Horizon telescope received an image of a supermassive black hole in the Sagittarius A * source. This image consists of a ring-like structure that contains three areas with increased brightness (spots). If we assume that these spots are associated with flares near the event horizon of a black hole, then we can estimate its spin. Our estimate gives a value of the order of a ≈ 0.9 .
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Andrianov et al. (2024) studied this question.
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