![]() ![]() We describe the EHT imaging procedures, the primary image features in M87, and the dependence of these features on imaging assumptions.© 2019. Across all tests in both stages, the ring diameter and asymmetry remained stable, insensitive to the choice of imaging technique. This stage allowed us to select parameters objectively to use when reconstructing images of M87. In the second stage, we reconstructed synthetic data from a large survey of imaging parameters and then compared the results with the corresponding ground truth images. This stage allowed us to avoid shared human bias and to assess common features among independent reconstructions. In the first stage, four teams, each blind to the others' work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). To assess the reliability of these results, we implemented a two-stage imaging procedure. The ring is persistent across four observing nights and shows enhanced brightness in the south. These images show a prominent ring with a diameter of ~40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" of a supermassive black hole. We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. Ministero dell'Istruzione, dell'Università e della Ricerca National Research Foundation (South Africa) Netherlands Organization for Scientific Research Natural Sciences and Engineering Research Council of Canada National Natural Science Foundation of China National Aeronautics and Space Administration (US) Ministry of Science and Technology (Taiwan) Japan Society for the Promotion of Science Ministerio de Ciencia, Innovación y Universidades (España) Ministerio de Economía y Competitividad (España) ![]() The Event Horizon Telescope CollaborationĬomisión Nacional de Investigación Científica y Tecnológica (Chile)Ĭonsejo Nacional de Ciencia y Tecnología (México) Imaging the Central Supermassive Black Hole ![]() First M87 Event Horizon Telescope Results. ![]()
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