{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,11,11]],"date-time":"2026-11-11T01:24:02Z","timestamp":1794360242304,"version":"4.9.0"},"reference-count":106,"publisher":"American Astronomical Society","issue":"1","license":[{"start":{"date-parts":[[2019,4,10]],"date-time":"2019-04-10T00:00:00Z","timestamp":1554854400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/creativecommons.org\/licenses\/by\/3.0\/"},{"start":{"date-parts":[[2019,4,10]],"date-time":"2019-04-10T00:00:00Z","timestamp":1554854400000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/iopscience.iop.org\/info\/page\/text-and-data-mining"}],"content-domain":{"domain":["iopscience.iop.org"],"crossmark-restriction":false},"short-container-title":["ApJL"],"published-print":{"date-parts":[[2019,4,10]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    We present the first Event Horizon Telescope (EHT) images of M87, using observations from April 2017 at 1.3 mm wavelength. These images show a prominent ring with a diameter of \u223c40\n                    <jats:italic>\u03bc<\/jats:italic>\n                    as, consistent with the size and shape of the lensed photon orbit encircling the \u201cshadow\u201d of a supermassive black hole. The ring is persistent across four observing nights and shows enhanced brightness in the south. To assess the reliability of these results, we implemented a two-stage imaging procedure. In the first stage, four teams, each blind to the others\u2019 work, produced images of M87 using both an established method (CLEAN) and a newer technique (regularized maximum likelihood). This stage allowed us to avoid shared human bias and to assess common features among independent reconstructions. 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 select parameters objectively to use when reconstructing images of M87. Across all tests in both stages, the ring diameter and asymmetry remained stable, insensitive to the choice of imaging technique. We describe the EHT imaging procedures, the primary image features in M87, and the dependence of these features on imaging assumptions.\n                  <\/jats:p>","DOI":"10.3847\/2041-8213\/ab0e85","type":"journal-article","created":{"date-parts":[[2019,4,9]],"date-time":"2019-04-09T07:13:15Z","timestamp":1554793995000},"page":"L4","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":1395,"title":["First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole"],"prefix":"10.3847","volume":"875","author":[{"name":"The Event Horizon Telescope Collaboration","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9475-4254","authenticated-orcid":false,"given":"Kazunori","family":"Akiyama","sequence":"additional","affiliation":[{"name":"National Radio Astronomy Observatory, 520 Edgemont Rd, Charlottesville, VA 22903,"},{"name":"Massachusetts Institute of Technology Haystack Observatory"},{"name":"National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588,"},{"name":"Black Hole Initiative at Harvard University"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9371-1033","authenticated-orcid":false,"given":"Antxon","family":"Alberdi","sequence":"additional","affiliation":[{"name":"Instituto de Astrof\u00edsica de Andaluc\u00eda\u2013CSIC, Glorieta de la Astronom\u00eda s\/n, E-18008 Granada,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Walter","family":"Alef","sequence":"additional","affiliation":[{"name":"Max-Planck-Institut f\u00fcr Radioastronomie, Auf dem H\u00fcgel 69, D-53121 Bonn,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Keiichi","family":"Asada","sequence":"additional","affiliation":[{"name":"Institute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS\/NTU No. 1, Sec. 4, Roosevelt Rd, Taipei 10617, Taiwan, R.O.C."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2200-5393","authenticated-orcid":false,"given":"Rebecca","family":"Azulay","sequence":"additional","affiliation":[{"name":"Universitat de Val\u00e8ncia"},{"name":"Universitat de Val\u00e8ncia"},{"name":"Max-Planck-Institut f\u00fcr Radioastronomie, Auf dem H\u00fcgel 69, D-53121 Bonn,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3090-3975","authenticated-orcid":false,"given":"Anne-Kathrin","family":"Baczko","sequence":"additional","affiliation":[{"name":"Max-Planck-Institut f\u00fcr Radioastronomie, Auf dem H\u00fcgel 69, D-53121 Bonn,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"David","family":"Ball","sequence":"additional","affiliation":[{"name":"University of Arizona"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0476-6647","authenticated-orcid":false,"given":"Mislav","family":"Balokovi\u0107","sequence":"additional","affiliation":[{"name":"Black Hole Initiative at Harvard University"},{"name":"Center for Astrophysics | Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138,"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9290-0764","authenticated-orcid":false,"given":"John","family":"Barrett","sequence":"additional","affiliation":[{"name":"Massachusetts Institute of Technology Haystack Observatory"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Dan","family":"Bintley","sequence":"additional","affiliation":[{"name":"East Asian Observatory, 660 N. 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