Black hole images: A review
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2023-06-01
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In recent years, unprecedented progress has been achieved regarding black holes’ observation through the electromagnetic channel. The images of the supermassive black holes M87* and Sgr A* released by the Event Horizon Telescope (EHT) Collaboration provided direct visual evidence for their existence, which has stimulated further studies on various aspects of the compact celestial objects. Moreover, the information stored in these images provides a new way to understand the pertinent physical processes that occurred near the black holes, to test alternative theories of gravity, and to furnish insight into fundamental physics. In this review, we briefly summarize the recent developments on the topic. In particular, we elaborate on the features and formation mechanism of black hole shadows, the properties of black hole images illuminated by the surrounding thin accretion disk, and the corresponding polarization patterns. The potential applications of the relevant studies are also addressed.
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Science China: Physics, Mechanics and Astronomy, v. 66, n. 6, 2023.
