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dc.contributor.authorThe Event Horizon Telescope Collaboration
dc.date.accessioned2021-10-27T20:05:57Z
dc.date.available2021-10-27T20:05:57Z
dc.date.issued2019
dc.identifier.urihttps://hdl.handle.net/1721.1/134644
dc.description.abstract© 2019. The American Astronomical Society.. 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 ∼40 μas, consistent with the size and shape of the lensed photon orbit encircling the "shadow" 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' 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.
dc.language.isoen
dc.publisherAmerican Astronomical Society
dc.relation.isversionof10.3847/2041-8213/ab0e85
dc.rightsCreative Commons Attribution 3.0 unported license
dc.rights.urihttps://creativecommons.org/licenses/by/3.0/
dc.sourceIOP Publishing
dc.titleFirst M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
dc.typeArticle
dc.contributor.departmentHaystack Observatory
dc.contributor.departmentMassachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
dc.relation.journalAstrophysical Journal Letters
dc.eprint.versionFinal published version
dc.type.urihttp://purl.org/eprint/type/JournalArticle
eprint.statushttp://purl.org/eprint/status/PeerReviewed
dc.date.updated2019-05-23T15:06:51Z
dspace.orderedauthorsAkiyama, K; Alberdi, A; Alef, W; Asada, K; Azulay, R; Baczko, A-K; Ball, D; Baloković, M; Barrett, J; Bintley, D; Blackburn, L; Boland, W; Bouman, KL; Bower, GC; Bremer, M; Brinkerink, CD; Brissenden, R; Britzen, S; Broderick, AE; Broguiere, D; Bronzwaer, T; Byun, D-Y; Carlstrom, JE; Chael, A; Chan, C-K; Chatterjee, S; Chatterjee, K; Chen, M-T; Chen, Y; Cho, I; Christian, P; Conway, JE; Cordes, JM; Crew, GB; Cui, Y; Davelaar, J; De Laurentis, M; Deane, R; Dempsey, J; Desvignes, G; Dexter, J; Doeleman, SS; Eatough, RP; Falcke, H; Fish, VL; Fomalont, E; Fraga-Encinas, R; Freeman, WT; Friberg, P; Fromm, CM; Gómez, JL; Galison, P; Gammie, CF; García, R; Gentaz, O; Georgiev, B; Goddi, C; Gold, R; Gu, M; Gurwell, M; Hada, K; Hecht, MH; Hesper, R; Ho, LC; Ho, P; Honma, M; Huang, C-WL; Huang, L; H Hughes, D; Ikeda, S; Inoue, M; Issaoun, S; James, DJ; Jannuzi, BT; Janssen, M; Jeter, B; Jiang, W; Johnson, MD; Jorstad, S; Jung, T; Karami, M; Karuppusamy, R; Kawashima, T; Keating, GK; Kettenis, M; Kim, J-Y; Kim, J; Kim, J; Kino, M; Koay, JY; Koch, PM; Koyama, S; Kramer, M; Kramer, C; Krichbaum, TP; Kuo, C-Y; Lauer, TR; Lee, S-S; Li, Y-R; Li, Z; Lindqvist, M; Liu, K; Liuzzo, E; Lo, W-P; Lobanov, AP; Loinard, L; Lonsdale, C; Lu, R-S; MacDonald, NR; Mao, J; Markoff, S; Marrone, DP; Marscher, AP; Martí-Vidal, I; Matsushita, S; Matthews, LD; Medeiros, L; Menten, KM; Mizuno, Y; Mizuno, I; Moran, JM; Moriyama, K; Moscibrodzka, M; Müller, C; Nagai, H; Nagar, NM; Nakamura, M; Narayan, R; Narayanan, G; Natarajan, I; Neri, R; Ni, C; Noutsos, A; Okino, H; Olivares, H; Oyama, T; Özel, F; Palumbo, DCM; Patel, N; Pen, U-L; Pesce, DW; Piétu, V; Plambeck, R; PopStefanija, A; Porth, O; Prather, B; Preciado-López, JA; Psaltis, D; Pu, H-Y; Ramakrishnan, V; Rao, R; Rawlings, MG; Raymond, AW; Rezzolla, L; Ripperda, B; Roelofs, F; Rogers, A; Ros, E; Rose, M; Roshanineshat, A; Rottmann, H; Roy, AL; Ruszczyk, C; Ryan, BR; Rygl, KLJ; Sánchez, S; Sánchez-Arguelles, D; Sasada, M; Savolainen, T; Schloerb, FP; Schuster, K-F; Shao, L; Shen, Z; Small, D; Sohn, BW; SooHoo, J; Tazaki, F; Tiede, P; Tilanus, RPJ; Titus, M; Toma, K; Torne, P; Trent, T; Trippe, S; Tsuda, S; van Bemmel, I; van Langevelde, HJ; van Rossum, DR; Wagner, J; Wardle, J; Weintroub, J; Wex, N; Wharton, R; Wielgus, M; Wong, GN; Wu, Q; Young, A; Young, K; Younsi, Z; Yuan, F; Yuan, Y-F; Zensus, JA; Zhao, G; Zhao, S-S; Zhu, Z; Farah, JR; Meyer-Zhao, Z; Michalik, D; Nadolski, A; Nishioka, H; Pradel, N; Primiani, RA; Souccar, K; Vertatschitsch, L; Yamaguchi, P
dspace.date.submission2019-05-23T15:06:55Z
mit.journal.volume875
mit.journal.issue1
mit.metadata.statusAuthority Work and Publication Information Needed


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