Event Horizon images of the black holes at the centers of M87 and Sgr A*
In 2019, 2021 and 2022, the Event Horizon Telescope (EHT) collaboration published the first images of supermassive black holes at the scales of their event horizons. These images (of M87 and Sgr A*) provided the first opportunity to test General Relativity in the high field regime of supermassive black holes as well as the models describing plasma physics in these extreme environments. In this colloquium, I will briefly describe how the images were obtained, and what their interpretation is. I will finish with a discussion of future opportunities, but the EHT and its potential successor.
Laurent Loinard is a professor of astrophysics at the National University of Mexico (UNAM) and a member of the Event Horizon Collaboration— currently the chair of the EHT Calibration and Error Working Group that overviews the calibration of all EHT data. He specialized in radio interferometry applied to star-formation and black hole environments, and has received several important distinctions both personally (e.g. a Guggenheim Fellowship and the Bessel Prize of the Humboldt Foundation) and as an EHT member, most notably the Breakthrough Prize in Fundamental Physics.