{"id":"W2939024351","doi":"10.3847/2041-8213/ab0c96","title":"First M87 Event Horizon Telescope Results. II. Array and Instrumentation","year":2019,"lang":"en","type":"article","venue":"The Astrophysical Journal Letters","topic":"Astrophysical Phenomena and Observations","field":"Physics and Astronomy","cited_by":1077,"is_retracted":false,"has_abstract":true,"ca_institutions":"Western University; Canadian Institute for Theoretical Astrophysics; Canadian Institute for Advanced Research; University of Toronto; Perimeter Institute; University of Waterloo","funders":"Los Alamos National Laboratory; Office of Polar Programs; Comisión Nacional de Investigación Científica y Tecnológica; Japan Society for the Promotion of Science; China Scholarship Council; John Templeton Foundation; Ministry of Education, Culture, Sports, Science and Technology; Ministerio de Economía y Competitividad; European Southern Observatory; Natural Sciences and Engineering Research Council of Canada; National Nuclear Security Administration; Institut Périmètre de physique théorique; Recruitment Program of Global Experts; Korea Astronomy and Space Science Institute; Ministero dello Sviluppo Economico; Max-Planck-Gesellschaft; Centre National de la Recherche Scientifique; National Research Foundation of Korea; Universidad Nacional Autónoma de México; Generalitat Valenciana; Nederlandse Organisatie voor Wetenschappelijk Onderzoek; Instituto de Astrofísica de Andalucía; Chinese Academy of Sciences; Academia Sinica; Toray Science Foundation; National Research Foundation; Strong; Harvard University; Innovation, Science and Economic Development Canada; National Astronomical Observatory of Japan; Associated Universities; Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México; Consejo Nacional de Ciencia y Tecnología; University of Chicago; Vetenskapsrådet; International Max Planck Research School for Environmental, Cellular and Molecular Microbiology; Smithsonian Institution; U.S. Department of Energy; Leverhulme Trust; European Commission; National Radio Astronomy Observatory; University of Arizona; Massachusetts Institute of Technology; National Institutes of Natural Sciences; Government of Canada; National Aeronautics and Space Administration; Istituto Nazionale di Fisica Nucleare; Department of Science and Technology, Ministry of Science and Technology, India; Russian Science Foundation; Ministerio de Ciencia, Innovación y Universidades; Gordon and Betty Moore Foundation; Compute Canada; National Science Foundation","keywords":"Very-long-baseline interferometry; Physics; Event horizon; Telescope; Hydrogen maser; Supermassive black hole; Millimeter; Instrumentation (computer programming); Angular resolution (graph drawing); Maser; Event (particle physics); Astronomy; Remote sensing; Astrophysics; Computer science; Geology; Galaxy","routes":{"ca_aff":true,"ca_fund":true,"ca_venue":false,"about_ca":false,"invisible_to_affiliation_only":false},"retraction":null,"screen":null,"direct_labels":[],"prediction":{"model_version":"metacan-v3-hybrid-931329e0061c","candidate_categories":[],"consensus_categories":[],"category_scores_codex":[0.002308695,0.0006827563,0.0007673973,0.001399424,0.001117758,0.001690505,0.0009718598,0.001063204,0.0102903],"category_scores_gemma":[0.00116057,0.0005058566,0.0007075199,0.001315525,0.0005119555,0.00108927,0.002015091,0.001293596,0.01065873],"about_ca_system_candidate":false,"about_ca_system_consensus":false,"about_ca_system_score_codex":0.001863051,"about_ca_system_score_gemma":0.001809708,"about_ca_topic_candidate":false,"about_ca_topic_consensus":false,"about_ca_topic_score_codex":0.006115525,"about_ca_topic_score_gemma":0.01297324,"domain_scores_codex":[0.9985583,0.0001488665,0.00004909592,0.0002269453,0.0007744875,0.0002423928],"domain_scores_gemma":[0.9988249,0.00007867637,0.0001139765,0.0004212442,0.0004027717,0.000158429],"domain_codex":null,"domain_gemma":null,"domain_candidate":null,"domain_consensus":null,"study_design_codex":"design_other","study_design_gemma":"bench_or_experimental","study_design_scores_codex":[0.002849726,0.0007502702,0.1202107,0.0008042146,0.0004027837,0.001456643,0.001475258,0.007993847,0.1252704,0.02139044,0.1908309,0.5265648],"study_design_scores_gemma":[0.00032061,0.0005835072,0.3157676,0.0001566738,0.0002605967,0.0009497075,0.0003230627,0.01008383,0.08104315,0.00435598,0.5860333,0.0001219802],"study_design_candidate":"bench_or_experimental","study_design_consensus":null,"genre_codex":"other","genre_gemma":"empirical","genre_scores_codex":[0.3007414,0.003187903,0.1346514,0.004097612,0.001766407,0.003488455,0.1076484,0.01491326,0.4295052],"genre_scores_gemma":[0.5480667,0.0008519294,0.2290078,0.002366978,0.0008074078,0.001346094,0.1238043,0.002786797,0.09096203],"genre_candidate":"empirical","genre_consensus":null,"teacher_disagreement_score":0.0102903,"threshold_uncertainty_score":0.03442448,"prediction_status":"machine_predicted_unvalidated"},"machine_scores":{"provisional":true,"baseline":true,"maturity_gate_passed":false,"score_opus":0.007352882862905335,"score_gpt":0.2133402530208863,"score_spread":0.205987370157981,"validation_status":"score_only:v0-immature-baseline","note":"Baseline scores from an immature model (maturity gate not passed). 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