Resolving the Inner Parsec of the Blazar J1924–2914 with the Event Horizon Telescope

  title={Resolving the Inner Parsec of the Blazar J1924–2914 with the Event Horizon Telescope},
  author={Sara Issaoun and Maciek Wielgus and Svetlana G. Jorstad and Thomas P. Krichbaum and Lindy L. Blackburn and Michael Janssen and Chi-kwan Chan and Dominic W. Pesce and Jos{\'e} L. G{\'o}mez and Kazunori Akiyama and Monika A. Mościbrodzka and Iv{\'a}n Mart{\'i}-Vidal and Andrew Chael and Rocco Lico and Junhao 峻豪 Liu 刘 and Venkatessh Ramakrishnan and Mikhail M. Lisakov and Antonio Fuentes and Guangyao Zhao and Kotaro Moriyama and Avery E. Broderick and Paul Tiede and Nicholas R. MacDonald and Yosuke Mizuno and Efthalia Traianou and Laurent Loinard and Jordy Davelaar and Mark A. Gurwell and Ru-Sen 如森 Lu 路 and Antxon Alberdi and Walter Alef and Juan Carlos Algaba and Richard Anantua and Keiichi Asada and Rebecca Azulay and Uwe Bach and Anne-Kathrin Baczko and David Ball and Mislav Balokovi{\'c} and John Barrett and Michi Baub{\"o}ck and Bradford A. Benson and Dan Bintley and Raymond Blundell and Wilfred Boland and Katherine L. Bouman and Geoff C. Bower and Hope Boyce and Michael Bremer and Christiaan D. Brinkerink and Roger Brissenden and Silke Britzen and Dominique Broguiere and Thomas Bronzwaer and Sandra Bustamante and Do-young Byun and John E. Carlstrom and Chiara Ceccobello and Koushik Chatterjee and Shami Chatterjee and Ming-Tang Chen and Yongjun 永 军 Chen 陈 and Ilje Cho and Pierre Christian and Nicholas S. Conroy and John E. Conway and James M. Cordes and Thomas M. Crawford and Geoffrey B. Crew and Alejandro Cruz-Osorio and Yuzhu Cui and Mariafelicia De Laurentis and Roger Deane and Jessica Dempsey and Gregory Desvignes and Jason Dexter and Sheperd S. Doeleman and Vedant Dhruv and Sergio Abraham Dzib Quijano and Ralph P. Eatough and Razieh Emami and Heino Falcke and Joseph R. Farah and Vincent L. Fish and Edward B. Fomalont and Heather A. Ford and Raquel Fraga-Encinas and William T. Freeman and Per Friberg and Christian M. Fromm and Peter Galison and Charles F. Gammie and Roberto Garc{\'i}a and Olivier Gentaz and Boris Georgiev and Ciriaco Goddi and Roman Gold and Arturo I. G{\'o}mez-Ruiz and Minfeng 敏峰 Gu 顾 and Kazuhiro Hada and Daryl Haggard and Michael H. Hecht and Ronald Hesper and Luis C. 子山 Ho 何 and Paul T. P. Ho and Mareki Honma and Chih-Wei L. Huang and Lei 磊 Huang 黄 and David H. Hughes and Shiro Ikeda and C. M. Violette Impellizzeri and Makoto Inoue and David J. James and Buell T. Jannuzi and Britton Jeter and Wu 悟 Jiang 江 and Alejandra Jim{\'e}nez-Rosales and Michael D. Johnson and Abhishek V. Joshi and Taehyun Jung and Mansour Karami and Ramesh Karuppusamy and Tomohisa Kawashima and Garrett K. Keating and Mark Kettenis and Dong-Jin Kim and Jae-Young Kim and Jongsoo Kim and Junhan Kim and Motoki Kino and Jun Yi Koay and Prashant Kocherlakota and Yutaro Kofuji and Patrick M. Koch and Shoko Koyama and Carsten Kramer and Michael Kramer and C. Y. Kuo and Noemi La Bella and Tod R. Lauer and Daeyoung Lee and Sang-Sung Lee and Po Kin Leung and Aviad Levis and Zhiyuan 志远 Li 李 and Greg Lindahl and Michael Lindqvist and Kuo Liu and Elisabetta Liuzzo and W. Lo and Andrei P. Lobanov and Colin J. Lonsdale and Jirong 基荣 Mao 毛 and Nicola Marchili and Sera B. Markoff and Daniel P. Marrone and Alan P. Marscher and Satoki Matsushita and Lynn D. Matthews and Lia Medeiros and Karl M. Menten and Daniel Michalik and Izumi Mizuno and James M. Moran and Cornelia M{\"u}ller and Alejandro Mus and Gibwa Musoke and Ioannis Myserlis and Andrew Nadolski and Hiroshi Nagai and Neil M. Nagar and Masanori Nakamura and Ramesh Narayan and Gopal Narayanan and Iniyan Natarajan and Antonios Nathanail and Joey Neilsen and Roberto Neri and Chunchong Ni and Aristeidis Noutsos and Michael A. Nowak and Junghwan Oh and Hiroki Okino and H{\'e}ctor Olivares and Gisela N. Ortiz-L{\'e}on and Tomoaki Oyama and Feryal {\"O}zel and Daniel C. M. Palumbo and Georgios Filippos Paraschos and Jongho Park and Harriet Parsons and Nimesh A. Patel and Ue-li Pen and Vincent Pi{\'e}tu and Richard L. Plambeck and Aleksandar PopStefanija and Oliver Porth and Felix M. P{\"o}tzl and Ben S. Prather and Jorge A. Preciado-L{\'o}pez and Dimitrios Psaltis and Hung-Yi Pu and Ramprasad Rao and Mark G. Rawlings and Alexander W. Raymond and Luciano Rezzolla and Angelo Ricarte and Bart Ripperda and Freek Roelofs and Alan E. E. Rogers and Eduardo Ros and Cristina Romero-Ca{\~n}izales and Arash Roshanineshat and Helge Rottmann and Alan L. Roy and Ignacio Ruiz and Chester A. Ruszczyk and Kazi L. J. Rygl and Salvador S{\'a}nchez and David S{\'a}nchez-Arguelles and Miguel S{\'a}nchez-Portal and Mahito Sasada and Kaushik Satapathy and Tuomas Savolainen and F. P. Schloerb and Karl F. Schuster and Lijing Shao and Zhiqiang 志强 Shen 沈 and Des Small and Bong Won Sohn and Jason SooHoo and Kamal Souccar and He 赫 Sun 孙 and Fumie Tazaki and Alexandra J. Tetarenko and Remo P. J. Tilanus and Michael Titus and Pablo Torne and Tyler Trent and Sascha Trippe and Ilse M. van Bemmel and Huib Jan van Langevelde and Daniel R. van Rossum and Jesse Vos and Jan Wagner and Derek Ward-Thompson and J. F. C. Wardle and Jonathan Weintroub and Norbert Wex and Robert S. Wharton and Kaj Wiik and Gunther Witzel and Michael F. Wondrak and George N. Wong and Qingwen 庆文 Wu 吴 and Paul Yamaguchi and Doosoo Yoon and Andr{\'e} Young and K. H. Young and Ziri Younsi and Feng 峰 Yuan 袁 and Ye-Fei 业 飞 Yuan 袁 and J. Anton Zensus and Shuo Zhang and Shan-Shan Zhao},
  journal={The Astrophysical Journal},
The blazar J1924–2914 is a primary Event Horizon Telescope (EHT) calibrator for the Galactic center’s black hole Sagittarius A*. Here we present the first total and linearly polarized intensity images of this source obtained with the unprecedented 20 μas resolution of the EHT. J1924–2914 is a very compact flat-spectrum radio source with strong optical variability and polarization. In April 2017 the source was observed quasi-simultaneously with the EHT (April 5–11), the Global Millimeter VLBI… 

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