{"id":"W4388500442","doi":"10.3847/2041-8213/acff70","title":"First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization","year":2023,"lang":"en","type":"article","venue":"The Astrophysical Journal Letters","topic":"Astrophysics and Cosmic Phenomena","field":"Physics and Astronomy","cited_by":87,"is_retracted":false,"has_abstract":true,"ca_institutions":"University of Lethbridge; Canadian Institute for Theoretical Astrophysics; University of Toronto; Perimeter Institute; University of Waterloo; Canadian Institute for Advanced Research; McGill University","funders":"Los Alamos National Laboratory; Oak Ridge National Laboratory; High Energy Physics; Office of International Science and Engineering; National Key Research and Development Program of China; Agencia Estatal de Investigación; Consejo Superior de Investigaciones Científicas; Japan Society for the Promotion of Science; Physics Division, National Center for Theoretical Sciences; National Nuclear Security Administration; Office of Science; Toray Science Foundation; East Asian Core Observatories Association; Institut Périmètre de physique théorique; Agencia Nacional de Investigación y Desarrollo; Fundación Bancaria Caixa d'Estalvis i Pensions de Barcelona; Istituto Nazionale di Fisica Nucleare; Recruitment Program of Global Experts; Ministry of Education, India; Academy of Finland; Max-Planck-Gesellschaft; National Natural Science Foundation of China; National Research Foundation of Korea; Ministerio de Ciencia, Innovación y Universidades; Nuclear Safety and Security Commission; Generalitat Valenciana; Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México; Ministerio de Ciencia e Innovación; Consejo Nacional de Ciencia y Tecnología; National Science Foundation; China Postdoctoral Science Foundation; Instituto de Astrofísica de Andalucía; Deutsche Forschungsgemeinschaft; Nederlandse Organisatie voor Wetenschappelijk Onderzoek; Chinese Academy of Sciences; Academia Sinica; Junta de Andalucía; Universiteit van Amsterdam; Natural Sciences and Engineering Research Council of Canada; European Southern Observatory; John Templeton Foundation; China Scholarship Council; Ministry of Education, Culture, Sports, Science and Technology; Radboud Universiteit; National Research Foundation; University of Pretoria; Joint Institute for Computational Fundamental Science; Smithsonian Institution; International Max Planck Research School for Environmental, Cellular and Molecular Microbiology; European Commission; Leverhulme Trust; National Radio Astronomy Observatory; Fundação de Amparo à Pesquisa do Estado de São Paulo; Vetenskapsrådet; U.S. Department of Energy; Universidad Nacional Autónoma de México; Korea Astronomy and Space Science Institute; Universiteit Leiden; Associated Universities; Space Telescope Science Institute; National Center for Theoretical Sciences; National Institutes of Natural Sciences; Government of Canada; Gordon and Betty Moore Foundation; National Aeronautics and Space Administration; National Astronomical Observatory of Japan; Flatiron Health","keywords":"Event horizon; 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