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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29344
Title: First M87 Event Horizon Telescope Results. IV. Imaging the Central Supermassive Black Hole
Authors: Event Horizon Telescope Collaboration
Akiyama, Kazunori
Alberdi, Antxon
Alef, Walter
Asada, Keiichi
Azulay, Rebecca
Baczko, Anne-Kathrin
Ball, David
Baloković, Mislav
Barrett, John
Bintley, Dan
Blackburn, Lindy
Boland, Wilfred
Bouman, Katherine L.
Bower, Geoffrey C.
Bremer, Michael
Brinkerink, Christiaan D.
Brissenden, Roger
Britzen, Silke
Broderick, Avery E.
Broguiere, Dominique
Bronzwaer, Thomas
Byun, Do-Young
Carlstrom, John E.
Chael, Andrew
Chan, Chi-kwan
Chatterjee, Shami
Chatterjee, Koushik
Chen, Ming-Tang
Chen, Yongjun
Cho, Ilje
Christian, Pierre
Conway, John E.
Cordes, James M.
Crew, Geoffrey B.
Cui, Yuzhu
Davelaar, Jordy
De Laurentis, Mariafelicia
Deane, Roger
Dempsey, Jessica
Desvignes, Gregory
Dexter, Jason
Doeleman, Sheperd S.
Eatough, Ralph P.
Falcke, Heino
Fish, Vincent L.
Fomalont, Ed
Fraga-Encinas, Raquel
Freeman, William T.
Friberg, Per
Fromm, Christian M.
Gómez, José L.
Galison, Peter
Gammie, Charles F.
García, Roberto
Gentaz, Olivier
Georgiev, Boris
GODDI, CIRIACO
Gold, Roman
Gu, Minfeng
Gurwell, Mark
Hada, Kazuhiro
Hecht, Michael H.
Hesper, Ronald
Ho, Luis C.
Ho, Paul
Honma, Mareki
Huang, Chih-Wei L.
Huang, Lei
Hughes, David H.
Ikeda, Shiro
Inoue, Makoto
Issaoun, Sara
James, David J.
Jannuzi, Buell T.
Janssen, Michael
Jeter, Britton
Jiang, Wu
Johnson, Michael D.
Jorstad, Svetlana
Jung, Taehyun
Karami, Mansour
Karuppusamy, Ramesh
Kawashima, Tomohisa
Keating, Garrett K.
Kettenis, Mark
Kim, Jae-Young
Kim, Junhan
Kim, Jongsoo
Kino, Motoki
Koay, Jun Yi
Koch, Patrick M.
Koyama, Shoko
Kramer, Michael
Kramer, Carsten
Krichbaum, Thomas P.
Kuo, Cheng-Yu
Lauer, Tod R.
Lee, Sang-Sung
Li, Yan-Rong
Li, Zhiyuan
Lindqvist, Michael
Liu, Kuo
LIUZZO, Elisabetta Teodorina 
Lo, Wen-Ping
Lobanov, Andrei P.
Loinard, Laurent
Lonsdale, Colin
Lu, Ru-Sen
MacDonald, Nicholas R.
Mao, Jirong
Markoff, Sera
Marrone, Daniel P.
Marscher, Alan P.
Martí-Vidal, Iván
Matsushita, Satoki
Matthews, Lynn D.
Medeiros, Lia
Menten, Karl M.
Mizuno, Yosuke
Mizuno, Izumi
Moran, James M.
Moriyama, Kotaro
Moscibrodzka, Monika
Müller, Cornelia
Nagai, Hiroshi
Nagar, Neil M.
Nakamura, Masanori
Narayan, Ramesh
Narayanan, Gopal
Natarajan, Iniyan
Neri, Roberto
Ni, Chunchong
Noutsos, Aristeidis
Okino, Hiroki
Olivares, Héctor
Oyama, Tomoaki
Özel, Feryal
Palumbo, Daniel C. M.
Patel, Nimesh
Pen, Ue-Li
Pesce, Dominic W.
Piétu, Vincent
Plambeck, Richard
PopStefanija, Aleksandar
Porth, Oliver
Prather, Ben
Preciado-López, Jorge A.
Psaltis, Dimitrios
Pu, Hung-Yi
Ramakrishnan, Venkatessh
Rao, Ramprasad
Rawlings, Mark G.
Raymond, Alexander W.
Rezzolla, Luciano
Ripperda, Bart
Roelofs, Freek
Rogers, Alan
Ros, Eduardo
Rose, Mel
Roshanineshat, Arash
Rottmann, Helge
Roy, Alan L.
Ruszczyk, Chet
Ryan, Benjamin R.
RYGL, Kazi Lucie Jessica 
Sánchez, Salvador
Sánchez-Arguelles, David
Sasada, Mahito
Savolainen, Tuomas
Schloerb, F. Peter
Schuster, Karl-Friedrich
Shao, Lijing
Shen, Zhiqiang
Small, Des
Sohn, Bong Won
SooHoo, Jason
Tazaki, Fumie
Tiede, Paul
Tilanus, Remo P. J.
Titus, Michael
Toma, Kenji
Torne, Pablo
Trent, Tyler
Trippe, Sascha
Tsuda, Shuichiro
van Bemmel, Ilse
van Langevelde, Huib Jan
van Rossum, Daniel R.
Wagner, Jan
Wardle, John
Weintroub, Jonathan
Wex, Norbert
Wharton, Robert
Wielgus, Maciek
Wong, George N.
Wu, Qingwen
Young, André
Young, Ken
Younsi, Ziri
Yuan, Feng
Yuan, Ye-Fei
Zensus, J. Anton
Zhao, Guangyao
Zhao, Shan-Shan
Zhu, Ziyan
Farah, Joseph R.
Meyer-Zhao, Zheng
Michalik, Daniel
Nadolski, Andrew
Nishioka, Hiroaki
Pradel, Nicolas
Primiani, Rurik A.
Souccar, Kamal
Vertatschitsch, Laura
Yamaguchi, Paul
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL LETTERS 
Number: 875
Issue: 1
First Page: L4
Abstract: 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.
URI: http://hdl.handle.net/20.500.12386/29344
URL: https://iopscience.iop.org/article/10.3847/2041-8213/ab0e85
ISSN: 2041-8205
DOI: 10.3847/2041-8213/ab0e85
Bibcode ADS: 2019ApJ...875L...4E
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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