First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization

Kazunori Akiyama; Antxon Alberdi; Walter Alef; Juan Carlos Algaba; Richard Anantua; Keiichi Asada; Rebecca Azulay; Uwe Bach; Anne-Kathrin Baczko; David Ball; Mislav Baloković; John Barrett; Michi Bauböck; Bradford A. Benson; Dan Bintley; Lindy Blackburn; Raymond Blundell; Katherine L. Bouman; Geoffrey C. Bower; Hope Boyce; Michael Bremer; Christiaan D. Brinkerink; Roger Brissenden; Silke Britzen; Avery E. Broderick; Dominique Broguiere; Thomas Bronzwaer; Sandra Bustamante; Do-Young Byun; John E. Carlstrom; Chiara Ceccobello; Andrew Chael; Chi-kwan Chan; Dominic O. Chang; Koushik Chatterjee; Shami Chatterjee; Ming-Tang Chen; Yongjun 永军 Chen 陈; Xiaopeng Cheng; Ilje Cho; Pierre Christian; Nicholas S. Conroy; John E. Conway; James M. Cordes; Thomas M. Crawford; Geoffrey B. Crew; Alejandro Cruz-Osorio; Yuzhu 玉竹 Cui 崔; Rohan Dahale; Jordy Davelaar; Mariafelicia De Laurentis; Roger Deane; Jessica Dempsey; Gregory Desvignes; Jason Dexter; Vedant Dhruv; Sheperd S. Doeleman; Sean Dougal; Sergio A. Dzib; Ralph P. Eatough; Razieh Emami; Heino Falcke; Joseph Farah; Vincent L. Fish; Ed Fomalont; H. Alyson Ford; Marianna Foschi; Raquel Fraga-Encinas; William T. Freeman; Per Friberg; Christian M. Fromm; Antonio Fuentes; Peter Galison; Charles F. Gammie; Roberto García; Olivier Gentaz; Boris Georgiev; Ciriaco Goddi; Roman Gold; Arturo I. Gómez-Ruiz; José L. Gómez; Minfeng 敏峰 Gu 顾; Mark Gurwell; Kazuhiro Hada; Daryl Haggard; Kari Haworth; Michael H. Hecht; Ronald Hesper; Dirk Heumann; Luis C. 子山 Ho 何; Paul Ho; Mareki Honma; Chih-Wei L. Huang; Lei 磊 Huang 黄; David H. Hughes; Shiro Ikeda; C. M. Violette Impellizzeri; Makoto Inoue; Sara Issaoun; David J. James; Buell T. Jannuzi; Michael Janssen; Britton Jeter; Wu 悟 Jiang 江; Alejandra Jiménez-Rosales; Michael D. Johnson; Svetlana Jorstad; Abhishek V. Joshi; Taehyun Jung; Mansour Karami; Ramesh Karuppusamy; Tomohisa Kawashima; Garrett K. Keating; Mark Kettenis; Dong-Jin Kim; Jae-Young Kim; Jongsoo Kim; Junhan Kim; Motoki Kino; Jun Yi Koay; Prashant Kocherlakota; Yutaro Kofuji; Patrick M. Koch; Shoko Koyama; Carsten Kramer; Joana A. Kramer; Michael Kramer; Thomas P. Krichbaum; Cheng-Yu Kuo; Noemi La Bella; Tod R. Lauer; Daeyoung Lee; Sang-Sung Lee; Po Kin Leung; Aviad Levis; Zhiyuan 志远 Li 李; Rocco Lico; Greg Lindahl; Michael Lindqvist; Mikhail Lisakov; Jun 俊 Liu 刘; Kuo Liu; Elisabetta Liuzzo; Wen-Ping Lo; Andrei P. Lobanov; Laurent Loinard; Colin J. Lonsdale; Amy E. Lowitz; Ru-Sen 如森 Lu 路; Nicholas R. MacDonald; Jirong 基荣 Mao 毛; Nicola Marchili; Sera Markoff; Daniel P. Marrone; Alan P. Marscher; Iván Martí-Vidal; Satoki Matsushita; Lynn D. Matthews; Lia Medeiros; Karl M. Menten; Daniel Michalik; Izumi Mizuno; Yosuke Mizuno; James M. Moran; Kotaro Moriyama; Monika Moscibrodzka; Wanga Mulaudzi; Cornelia Müller; Hendrik Müller; Alejandro Mus; Gibwa Musoke; Ioannis Myserlis; Andrew Nadolski; Hiroshi Nagai; Neil M. Nagar; Masanori Nakamura; Ramesh Narayan; Gopal Narayanan; Iniyan Natarajan; Antonios Nathanail; Santiago Navarro Fuentes; Joey Neilsen; Roberto Neri; Chunchong Ni; Aristeidis Noutsos; Michael A. Nowak; Junghwan Oh; Hiroki Okino; Héctor Olivares; Gisela N. Ortiz-León; Tomoaki Oyama; Feryal Özel; Daniel C. M. Palumbo; Georgios Filippos Paraschos; Jongho Park; Harriet Parsons; Nimesh Patel; Ue-Li Pen; Dominic W. Pesce; Vincent Piétu; Richard Plambeck; Aleksandar PopStefanija; Oliver Porth; Felix M. Pötzl; Ben Prather; Jorge A. Preciado-López; Dimitrios Psaltis; Hung-Yi Pu; Venkatessh Ramakrishnan; Ramprasad Rao; Mark G. Rawlings; Alexander W. Raymond; Luciano Rezzolla; Angelo Ricarte; Bart Ripperda; Freek Roelofs; Alan Rogers; Cristina Romero-Cañizales; Eduardo Ros; Arash Roshanineshat; Helge Rottmann; Alan L. Roy; Ignacio Ruiz; Chet Ruszczyk; Kazi L. J. Rygl; Salvador Sánchez; David Sánchez-Argüelles; Miguel Sánchez-Portal; Mahito Sasada; Kaushik Satapathy; Tuomas Savolainen; F. Peter Schloerb; Jonathan Schonfeld; Karl-Friedrich Schuster; Lijing Shao; Zhiqiang 志强 Shen 沈; Des Small; Bong Won Sohn; Jason SooHoo; León David Sosapanta Salas; Kamal Souccar; He 赫 Sun 孙; Fumie Tazaki; Alexandra J. Tetarenko; Paul Tiede; Remo P. J. Tilanus; Michael Titus; Pablo Torne; Teresa Toscano; Efthalia Traianou; Tyler Trent; Sascha Trippe; Matthew Turk; Ilse van Bemmel; Huib Jan van Langevelde; Daniel R. van Rossum; Jesse Vos; Jan Wagner; Derek Ward-Thompson; John Wardle; Jasmin E. Washington; Jonathan Weintroub; Robert Wharton; Maciek Wielgus; Kaj Wiik; Gunther Witzel; Michael F. Wondrak; George N. Wong; Qingwen 庆文 Wu 吴; Nitika Yadlapalli; Paul Yamaguchi; Aristomenis Yfantis; Doosoo Yoon; André Young; Ken Young; Ziri Younsi; Wei 威 Yu 于; Feng 峰 Yuan 袁; Ye-Fei 业飞 Yuan 袁; J. Anton Zensus; Shuo Zhang; Guang-Yao Zhao; Shan-Shan 杉杉 Zhao 赵; The Event Horizon Telescope Collaboration

doi:10.3847/2041-8213/acff70

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First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization

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First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization

Kazunori Akiyama, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Uwe Bach, Anne-Kathrin Baczko, David Ball, …

Astrophysical journal. Letters, Vol.957(2), p.L20

11/01/2023

DOI: https://doi.org/10.3847/2041-8213/acff70

Abstract

Abstract Event Horizon Telescope (EHT) observations have revealed a bright ring of emission around the supermassive black hole at the center of the M87 galaxy. EHT images in linear polarization have further identified a coherent spiral pattern around the black hole, produced from ordered magnetic fields threading the emitting plasma. Here we present the first analysis of circular polarization using EHT data, acquired in 2017, which can potentially provide additional insights into the magnetic fields and plasma composition near the black hole. Interferometric closure quantities provide convincing evidence for the presence of circularly polarized emission on event-horizon scales. We produce images of the circular polarization using both traditional and newly developed methods. All methods find a moderate level of resolved circular polarization across the image (〈∣ v ∣〉 < 3.7%), consistent with the low image-integrated circular polarization fraction measured by the Atacama Large Millimeter/submillimeter Array (∣ v int ∣ < 1%). Despite this broad agreement, the methods show substantial variation in the morphology of the circularly polarized emission, indicating that our conclusions are strongly dependent on the imaging assumptions because of the limited baseline coverage, uncertain telescope gain calibration, and weakly polarized signal. We include this upper limit in an updated comparison to general relativistic magnetohydrodynamic simulation models. This analysis reinforces the previously reported preference for magnetically arrested accretion flow models. We find that most simulations naturally produce a low level of circular polarization consistent with our upper limit and that Faraday conversion is likely the dominant production mechanism for circular polarization at 230 GHz in M87*.

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Title: First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization
Creators: Kazunori Akiyama - Woodwell Climate Research Center
Antxon Alberdi - Instituto de Astrofísica de Andalucía
Walter Alef - Max Planck Institute for Radio Astronomy
Juan Carlos Algaba - University of Malaya
Richard Anantua - Woodwell Climate Research Center
Keiichi Asada - Institute of Astronomy and Astrophysics, Academia Sinica
Rebecca Azulay - Parc Científic de la Universitat de València
Uwe Bach - Max Planck Institute for Radio Astronomy
Anne-Kathrin Baczko - Chalmers University of Technology
David Ball - University of Arizona
Mislav Baloković - Yale University
John Barrett - Massachusetts Institute of Technology
Michi Bauböck - University of Illinois Urbana-Champaign
Bradford A. Benson - Fermi National Accelerator Laboratory
Dan Bintley - East Asian Observatory
Lindy Blackburn - Woodwell Climate Research Center
Raymond Blundell - Center for Astrophysics Harvard & Smithsonian
Katherine L. Bouman - California Institute of Technology
Geoffrey C. Bower - University of Hawaiʻi at Mānoa
Hope Boyce - McGill University
Michael Bremer - Institut de Radioastronomie Millimétrique
Christiaan D. Brinkerink - Radboud University Nijmegen
Roger Brissenden - Woodwell Climate Research Center
Silke Britzen - Max Planck Institute for Radio Astronomy
Avery E. Broderick - Perimeter Institute
Dominique Broguiere - Institut de Radioastronomie Millimétrique
Thomas Bronzwaer - Radboud University Nijmegen
Sandra Bustamante - University of Massachusetts Amherst
Do-Young Byun - Korea Astronomy and Space Science Institute
John E. Carlstrom - University of Chicago
Chiara Ceccobello - Chalmers University of Technology
Andrew Chael - Princeton Plasma Physics Laboratory
Chi-kwan Chan - University of Arizona
Dominic O. Chang - Woodwell Climate Research Center
Koushik Chatterjee - Woodwell Climate Research Center
Shami Chatterjee - Cornell University
Ming-Tang Chen
Yongjun 永军 Chen 陈
Xiaopeng Cheng - Korea Astronomy and Space Science Institute
Ilje Cho - Instituto de Astrofísica de Andalucía
Pierre Christian - Fairfield University
Nicholas S. Conroy - University of Illinois Urbana-Champaign
John E. Conway - Chalmers University of Technology
James M. Cordes - Cornell University
Thomas M. Crawford - University of Chicago
Geoffrey B. Crew - Massachusetts Institute of Technology
Alejandro Cruz-Osorio - Universidad Nacional Autónoma de México
Yuzhu 玉竹 Cui 崔
Rohan Dahale - Instituto de Astrofísica de Andalucía
Jordy Davelaar - Columbia University
Mariafelicia De Laurentis - INFN Sezione di Napoli
Roger Deane - Rhodes University
Jessica Dempsey - East Asian Observatory
Gregory Desvignes - Université Paris Cité
Jason Dexter - Joint Institute for Laboratory Astrophysics
Vedant Dhruv - University of Illinois Urbana-Champaign
Sheperd S. Doeleman - Harvard University
Sean Dougal - University of Arizona
Sergio A. Dzib - Max Planck Institute for Radio Astronomy
Ralph P. Eatough - National Astronomical Observatories
Razieh Emami - Center for Astrophysics Harvard & Smithsonian
Heino Falcke - Radboud University Nijmegen
Joseph Farah - Las Cumbres Observatory Global Telescope Network
Vincent L. Fish - Massachusetts Institute of Technology
Ed Fomalont - National Radio Astronomy Observatory
H. Alyson Ford - University of Arizona
Marianna Foschi - Instituto de Astrofísica de Andalucía
Raquel Fraga-Encinas - Radboud University Nijmegen
William T. Freeman - Massachusetts Institute of Technology
Per Friberg - East Asian Observatory
Christian M. Fromm - Max Planck Institute for Radio Astronomy
Antonio Fuentes - Instituto de Astrofísica de Andalucía
Peter Galison - Harvard University
Charles F. Gammie - University of Illinois Urbana-Champaign
Roberto García - Institut de Radioastronomie Millimétrique
Olivier Gentaz - Institut de Radioastronomie Millimétrique
Boris Georgiev - University of Waterloo
Ciriaco Goddi - Osservatorio Astronomico di Cagliari
Roman Gold - University of Southern Denmark
Arturo I. Gómez-Ruiz - National Institute of Astrophysics, Optics and Electronics
José L. Gómez - Instituto de Astrofísica de Andalucía
Minfeng 敏峰 Gu 顾
Mark Gurwell - Center for Astrophysics Harvard & Smithsonian
Kazuhiro Hada - The Graduate University for Advanced Studies, SOKENDAI
Daryl Haggard - McGill University
Kari Haworth - Center for Astrophysics Harvard & Smithsonian
Michael H. Hecht - Massachusetts Institute of Technology
Ronald Hesper - University of Groningen
Dirk Heumann - University of Arizona
Luis C. 子山 Ho 何
Paul Ho
Mareki Honma - The University of Tokyo
Chih-Wei L. Huang - Institute of Astronomy and Astrophysics, Academia Sinica
Lei 磊 Huang 黄
David H. Hughes - National Institute of Astrophysics, Optics and Electronics
Shiro Ikeda - National Astronomical Observatory of Japan
C. M. Violette Impellizzeri - Leiden University
Makoto Inoue - Institute of Astronomy and Astrophysics, Academia Sinica
Sara Issaoun - Center for Astrophysics Harvard & Smithsonian
David J. James - Applied Materials
Buell T. Jannuzi - University of Arizona
Michael Janssen - Max Planck Institute for Radio Astronomy
Britton Jeter - Institute of Astronomy and Astrophysics, Academia Sinica
Wu 悟 Jiang 江
Alejandra Jiménez-Rosales - Radboud University Nijmegen
Michael D. Johnson - Center for Astrophysics Harvard & Smithsonian
Svetlana Jorstad - Boston University
Abhishek V. Joshi - University of Illinois Urbana-Champaign
Taehyun Jung - Korea Astronomy and Space Science Institute
Mansour Karami - University of Waterloo
Ramesh Karuppusamy - Max Planck Institute for Radio Astronomy
Tomohisa Kawashima - The University of Tokyo
Garrett K. Keating - Center for Astrophysics Harvard & Smithsonian
Mark Kettenis - Joint Institute for VLBI ERIC
Dong-Jin Kim - Max Planck Institute for Radio Astronomy
Jae-Young Kim - Max Planck Institute for Radio Astronomy
Jongsoo Kim - Korea Astronomy and Space Science Institute
Junhan Kim - California Institute of Technology
Motoki Kino - Kogakuin University
Jun Yi Koay - Institute of Astronomy and Astrophysics, Academia Sinica
Prashant Kocherlakota - Goethe University Frankfurt
Yutaro Kofuji - The University of Tokyo
Patrick M. Koch - Institute of Astronomy and Astrophysics, Academia Sinica
Shoko Koyama - Niigata University
Carsten Kramer - Institut de Radioastronomie Millimétrique
Joana A. Kramer - Max Planck Institute for Radio Astronomy
Michael Kramer - Max Planck Institute for Radio Astronomy
Thomas P. Krichbaum - Max Planck Institute for Radio Astronomy
Cheng-Yu Kuo
Noemi La Bella - Radboud University Nijmegen
Tod R. Lauer - Kitt Peak National Observatory
Daeyoung Lee - University of Illinois Urbana-Champaign
Sang-Sung Lee - Korea Astronomy and Space Science Institute
Po Kin Leung - Chinese University of Hong Kong
Aviad Levis - California Institute of Technology
Zhiyuan 志远 Li 李
Rocco Lico - Istituto di Radioastronomia di Bologna
Greg Lindahl - Center for Astrophysics Harvard & Smithsonian
Michael Lindqvist - Chalmers University of Technology
Mikhail Lisakov - Max Planck Institute for Radio Astronomy
Jun 俊 Liu 刘
Kuo Liu - Max Planck Institute for Radio Astronomy
Elisabetta Liuzzo - Istituto di Radioastronomia di Bologna
Wen-Ping Lo - National Taiwan University
Andrei P. Lobanov - Max Planck Institute for Radio Astronomy
Laurent Loinard - Universidad Nacional Autónoma de México
Colin J. Lonsdale - Massachusetts Institute of Technology
Amy E. Lowitz - University of Arizona
Ru-Sen 如森 Lu 路
Nicholas R. MacDonald - Max Planck Institute for Radio Astronomy
Jirong 基荣 Mao 毛
Nicola Marchili - Istituto di Radioastronomia di Bologna
Sera Markoff - The Netherlands Cancer Institute
Daniel P. Marrone - University of Arizona
Alan P. Marscher - Boston University
Iván Martí-Vidal - Parc Científic de la Universitat de València
Satoki Matsushita - Institute of Astronomy and Astrophysics, Academia Sinica
Lynn D. Matthews - Massachusetts Institute of Technology
Lia Medeiros - Princeton University
Karl M. Menten - Max Planck Institute for Radio Astronomy
Daniel Michalik - University of Chicago
Izumi Mizuno - East Asian Observatory
Yosuke Mizuno - Shanghai Jiao Tong University
James M. Moran - Woodwell Climate Research Center
Kotaro Moriyama - National Astronomical Observatory of Japan
Monika Moscibrodzka - Radboud University Nijmegen
Wanga Mulaudzi - The Netherlands Cancer Institute
Cornelia Müller - Radboud University Nijmegen
Hendrik Müller - Max Planck Institute for Radio Astronomy
Alejandro Mus - Parc Científic de la Universitat de València
Gibwa Musoke - The Netherlands Cancer Institute
Ioannis Myserlis - Shanghai Jiao Tong University
Andrew Nadolski - University of Illinois Urbana-Champaign
Hiroshi Nagai - National Astronomical Observatory of Japan
Neil M. Nagar - University of Concepción
Masanori Nakamura - Hachinohe National College of Technology
Ramesh Narayan - Woodwell Climate Research Center
Gopal Narayanan - University of Massachusetts Amherst
Iniyan Natarajan - Woodwell Climate Research Center
Antonios Nathanail - Academy of Athens
Santiago Navarro Fuentes - Instituto de Radioastronomía Milimétrica
Joey Neilsen - Villanova University
Roberto Neri - Institut de Radioastronomie Millimétrique
Chunchong Ni - University of Waterloo
Aristeidis Noutsos - Max Planck Institute for Radio Astronomy
Michael A. Nowak - Washington University in St. Louis
Junghwan Oh - Sejong University
Hiroki Okino - National Astronomical Observatory of Japan
Héctor Olivares - Radboud University Nijmegen
Gisela N. Ortiz-León - National Institute of Astrophysics, Optics and Electronics
Tomoaki Oyama - National Astronomical Observatory of Japan
Feryal Özel - Georgia Institute of Technology
Daniel C. M. Palumbo - Woodwell Climate Research Center
Georgios Filippos Paraschos - Max Planck Institute for Radio Astronomy
Jongho Park
Harriet Parsons - East Asian Observatory
Nimesh Patel - Center for Astrophysics Harvard & Smithsonian
Ue-Li Pen - Canadian Institute for Theoretical Astrophysics
Dominic W. Pesce - Woodwell Climate Research Center
Vincent Piétu - Institut de Radioastronomie Millimétrique
Richard Plambeck - University of California, Berkeley
Aleksandar PopStefanija - University of Massachusetts Amherst
Oliver Porth - The Netherlands Cancer Institute
Felix M. Pötzl - Foundation for Research and Technology Hellas
Ben Prather - University of Illinois Urbana-Champaign
Jorge A. Preciado-López - Perimeter Institute
Dimitrios Psaltis - Georgia Institute of Technology
Hung-Yi Pu - National Taiwan Normal University
Venkatessh Ramakrishnan - Aalto University
Ramprasad Rao - Center for Astrophysics Harvard & Smithsonian
Mark G. Rawlings - East Asian Observatory
Alexander W. Raymond - Woodwell Climate Research Center
Luciano Rezzolla - Trinity College Dublin
Angelo Ricarte - Woodwell Climate Research Center
Bart Ripperda - Canadian Institute for Theoretical Astrophysics
Freek Roelofs - Woodwell Climate Research Center
Alan Rogers
Cristina Romero-Cañizales - Institute of Astronomy and Astrophysics, Academia Sinica
Eduardo Ros - Max Planck Institute for Radio Astronomy
Arash Roshanineshat - University of Arizona
Helge Rottmann - Max Planck Institute for Radio Astronomy
Alan L. Roy - Max Planck Institute for Radio Astronomy
Ignacio Ruiz - Instituto de Radioastronomía Milimétrica
Chet Ruszczyk - Massachusetts Institute of Technology
Kazi L. J. Rygl - Istituto di Radioastronomia di Bologna
Salvador Sánchez - Instituto de Radioastronomía Milimétrica
David Sánchez-Argüelles - National Institute of Astrophysics, Optics and Electronics
Miguel Sánchez-Portal
Mahito Sasada - Hiroshima University
Kaushik Satapathy - University of Arizona
Tuomas Savolainen - Aalto University
F. Peter Schloerb - University of Massachusetts Amherst
Jonathan Schonfeld - Center for Astrophysics Harvard & Smithsonian
Karl-Friedrich Schuster - Institut de Radioastronomie Millimétrique
Lijing Shao - Kavli Institute for Theoretical Sciences
Zhiqiang 志强 Shen 沈
Des Small - Joint Institute for VLBI ERIC
Bong Won Sohn - Korea Astronomy and Space Science Institute
Jason SooHoo - Massachusetts Institute of Technology
León David Sosapanta Salas
Kamal Souccar - University of Massachusetts Amherst
He 赫 Sun 孙
Fumie Tazaki - National Astronomical Observatory of Japan
Alexandra J. Tetarenko - University of Lethbridge
Paul Tiede - Woodwell Climate Research Center
Remo P. J. Tilanus - University of Arizona
Michael Titus - Massachusetts Institute of Technology
Pablo Torne - Instituto de Radioastronomía Milimétrica
Teresa Toscano - Instituto de Astrofísica de Andalucía
Efthalia Traianou - Max Planck Institute for Radio Astronomy
Tyler Trent - University of Arizona
Sascha Trippe - Seoul National University
Matthew Turk - University of Illinois Urbana-Champaign
Ilse van Bemmel - Joint Institute for VLBI ERIC
Huib Jan van Langevelde - Joint Institute for VLBI ERIC
Daniel R. van Rossum - Radboud University Nijmegen
Jesse Vos - Radboud University Nijmegen
Jan Wagner - Max Planck Institute for Radio Astronomy
Derek Ward-Thompson - University of Central Lancashire
John Wardle
Jasmin E. Washington - University of Arizona
Jonathan Weintroub - Woodwell Climate Research Center
Robert Wharton - Max Planck Institute for Radio Astronomy
Maciek Wielgus - Max Planck Institute for Radio Astronomy
Kaj Wiik - University of Turku
Gunther Witzel - Max Planck Institute for Radio Astronomy
Michael F. Wondrak - Radboud University Nijmegen
George N. Wong - Princeton Plasma Physics Laboratory
Qingwen 庆文 Wu 吴
Nitika Yadlapalli - California Institute of Technology
Paul Yamaguchi - Center for Astrophysics Harvard & Smithsonian
Aristomenis Yfantis - Radboud University Nijmegen
Doosoo Yoon - The Netherlands Cancer Institute
André Young - Radboud University Nijmegen
Ken Young - Center for Astrophysics Harvard & Smithsonian
Ziri Younsi - University College London
Wei 威 Yu 于
Feng 峰 Yuan 袁
Ye-Fei 业飞 Yuan 袁
J. Anton Zensus - Max Planck Institute for Radio Astronomy
Shuo Zhang - Michigan State University
Guang-Yao Zhao - Instituto de Astrofísica de Andalucía
Shan-Shan 杉杉 Zhao 赵
The Event Horizon Telescope Collaboration
Publication Details: Astrophysical journal. Letters, Vol.957(2), p.L20
Identifiers: 9924301557701921
Academic Unit: Martin A. Fisher School of Physics
Language: English
Resource Type: Journal article

First M87 Event Horizon Telescope Results. IX. Detection of Near-horizon Circular Polarization

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