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

  • Sara Issaoun
  • , Maciek Wielgus
  • , Svetlana Jorstad
  • , Thomas P. Krichbaum
  • , Lindy Blackburn
  • , Michael Janssen
  • , Chi Kwan Chan
  • , Dominic W. Pesce
  • , José L. Gómez
  • , Kazunori Akiyama
  • , Monika Moscibrodzka
  • , Iván Martí-Vidal
  • , Andrew Chael
  • , Rocco Lico
  • , Venkatessh Ramakrishnan
  • , Jun Liu
  • , Mikhail Lisakov
  • , Antonio Fuentes
  • , Guang Yao Zhao
  • , Kotaro Moriyama
  • Avery E. Broderick, Pauli Tiede, Nicholas R. MacDonald, Min Gao, Efthalia Traianou, Laurent Loinard, Jordy Davelaar, Mark Gurwell, Ru Sen Lu, Antxon Alberdi, Walter Alef, Juan Carlos Algaba, Richard Anantua, Keiichi Asada, Rebecca Azulay, Anne Kathrin Baczko, David Ball, Mislav Balokovic, John Barrett, Michi Bauböck, Bradford A. Benson, Uwe Bach, Dan Bintley, Raymond Blundell, Wilfred Boland, Katherine L. Bouman, Geoffrey C. Bower, Hope Boyce, Michael Bremer, Christiaan D. Brinkerink, Roger Brissenden, Silke Britzen, Dominique Broguiere, Thomas Bronzwaer, Sandra Bustamante, Do Young Byun, John E. Carlstrom, Chiara Ceccobello, Koushik Chatterjee, Shami Chatterjee, Ming Tang Chen, Yongjun Chen, Ilje Cho, Pierre Christian, Nicholas S. Conroy, John E. Conway, James M. Cordes, Thomas M. Crawford, Geoffrey B. Crew, Alejandro Cruz-Osorio, Yuzhu Cui, Mariafelicia De Laurentis, Roger Deane, Jessica Dempsey, Gregory Desvignes, Jason Dexter, Sheperd S. Doeleman, Vedant Dhruv, Sergio Abraham Dzib Quijano, Ralph P. Eatough, Razieh Emami, Heino Falcke, Joseph Farah, Vincent L. Fish, Ed Fomalont, H. Alyson Ford, Raquel Fraga-Encinas, William T. Freeman, Per Friberg, Christian M. Fromm, Peter Galison, Charles F. Gammie, Roberto García, Olivier Gentaz, Boris Georgiev, Ciriaco Goddi, Roman Gold, Arturo I. Gómez-Ruiz, Minfeng Gu, Kazuhiro Hada, Daryl Haggard, Ronald Hesper, Luis C. Ho, Michael H. Hecht, Paul Ho, Mareki Honma, Chih Wei L. Huang, Lei Huang, David H. Hughes, Shiro Ikeda, C. M.Violette Impellizzeri, Makoto Inoue, David J. James, Buell T. Jannuzi, Britton Jeter, Wu Jiang, Alejandra Jimenez-Rosales, Michael D. Johnson, 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, Michael Kramer, Cheng Yu Kuo, Tod R. Lauer, Daeyoung Lee, Sang Sung Lee, Po Kin Leung, Aviad Levis, Zhiyuan Li, Noemi La Bella, Rocce Lico, Greg Lindahl, Michael Lindqvist, Kuo Liu, Elisabetta Liuzzo, Wen Ping Lo, Andrei P. Lobanov, Colin Lonsdale, Jirong Mao, Nicola Marchili, Sera Markoff, Daniel P. Marrone, Alan P. Marscher, Satoki Matsushita, Lynn D. Matthews, Lia Medeiros, Karl M. Menten, Daniel Michalik, Izumi Mizuno, Chunchong Nie, James M. Moran, Cornelia Müller, Alejandro Mus, Gibwa Musoke, Ioannis Myserlis, Andrew Nadolski, Hiroshi Nagai, Neil M. Nagar, Masanori Nakamura, Ramesh Narayan, Gopal Narayanan, Iniyan Natarajan, Antonios Nathanail, 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, Vincent Piétu, Richard Plambeck, Aleksandar PopStefanija, Oliver Porth, Felix M. Pötzl, Ben Prather, Jorge A. Preciado-López, Dimitrios Psaltis, Hung Yi Pu, Ramprasad Rao, Mark G. Rawlings, Alexander W. Raymond, Luciano Rezzolla, Angelo Ricarte, Bart Ripperda, Alan Rogers, Eduardo Ros, Cristina Romero-Canizales, Arash Roshanineshat, Helge Rottmann, Alan L. Roy, Freek Roelofs, Ignacio Ruiz, Chet Ruszczyk, Kazi L.J. Rygl, Salvador Sánchez, David Sánchez-Arguelles, Miguel Sanchez-Portal, Mahito Sasada, Kaushik Satapathy, Tuomas Savolainen, F. Peter Schloerb, Karl Friedrich Schuster, Lijing Shao, Zhiqiang Shen, Bong Won Sohn, Des Small, Jason SooHoo, Kamal Souccar, He Sun, Fumie Tazaki, Alexandra J. Tetarenko, Paul Tiedee, Remo P.J. Tilanus, Michael Titus, Pablo Torne, Tyler Trent, Sascha Trippe, Ilse van Bemmel, Huib Jan van Langevelde, Daniel R. van Rossum, Jesse Vos, Jan Wagner, Derek Ward-Thompson, John Wardle, Jonathan Weintroub, Norbert Wex, Robert Wharton, Kaj Wiik, Gunther Witzel, Michael Wondrak, George N. Wong, Qingwen Wu, Paul Yamaguchi, Doosoo Yoon, André Young, Ken Young, Ziri Younsi, Feng Yuan, Ye Fei Yuan, J. Anton Zensus, Shuo Zhang, Shan Shan Zhao
  • Harvard-Smithsonian Center for Astrophysics
  • Radboud University Nijmegen
  • NASA Hubble Fellowship Program
  • Max Planck Institute for Radio Astronomy
  • Boston University
  • Harvard University
  • University of Arizona
  • CSIC - Institute of Astrophysics of Andalusia
  • Massachusetts Institute of Technology
  • National Institutes of Natural Sciences - National Astronomical Observatory of Japan
  • University of Valencia
  • Princeton University
  • National Institute for Astrophysics
  • Universidad de Concepción
  • University of Turku
  • Aalto University
  • Goethe University Frankfurt
  • Perimeter Institute for Theoretical Physics
  • University of Waterloo
  • Las Cumbres Observatory Global Telescope Network, Inc.
  • Universidad Nacional Autónoma de México
  • Columbia University
  • Simons Foundation
  • CAS - Shanghai Astronomical Observatory
  • Chinese Academy of Sciences
  • University of Malaya
  • University of Texas at San Antonio
  • Academia Sinica - Institute of Astronomy and Astrophysics
  • Yale University
  • University of Illinois at Urbana-Champaign
  • Fermi National Accelerator Laboratory
  • The University of Chicago
  • East Asian Observatory
  • James Clerk Maxwell Telescope (JCMT)
  • Nederlandse Onderzoekschool voor Astronomie (NOVA)
  • California Institute of Technology
  • University of Hawai'i at Mānoa
  • McGill University
  • Institut de radioastronomie millimétrique
  • University of Massachusetts
  • Korea Astronomy and Space Science Institute
  • University of Science and Technology UST
  • Chalmers University of Technology
  • Cornell University
  • Fairfield University
  • The Graduate University for Advanced Studies
  • University of Naples Federico II
  • National Institute for Nuclear Physics
  • University of the Witwatersrand
  • University of Pretoria
  • Rhodes University
  • Netherlands Institute for Radio Astronomy
  • Observatoire de Paris
  • JILA
  • CAS - National Astronomical Observatories
  • University of California at Santa Barbara
  • National Science Foundation
  • Alphabet Inc.
  • University of Würzburg
  • University of Cagliari
  • University of Southern Denmark
  • Instituto Nacional de Astrofisica Optica y Electronica
  • Consejo Nacional de Ciencia y Tecnologia Mexico
  • University of Groningen
  • Peking University
  • The University of Tokyo
  • Research Organization of Information and Systems, The Institute of Statistical Mathematics
  • Leiden University
  • ASTRAVEO LLC
  • Joint Institute for VLBI ERIC (JIVE)
  • Kogakuin University
  • Niigata University
  • National Sun Yat-sen University
  • National Optical Astronomy Observatory
  • Chinese University of Hong Kong
  • Nanjing University
  • National Taiwan University
  • University of Amsterdam
  • Institute for Advanced Studies
  • ESTEC
  • Shanghai Jiao Tong University
  • Institut de Radioastronomie Millimétrique (IRAM)
  • National Institute of Technology, Hachinohe College
  • South African Radio Astronomy Observatory
  • National and Kapodistrian University of Athens
  • Villanova University
  • Washington University St. Louis
  • Sejong University
  • University of Toronto
  • Canadian Institute for Advanced Research
  • University of California at Berkeley
  • University College Cork
  • National Taiwan Normal University
  • Gemini Observatory
  • Trinity College Dublin
  • Hiroshima University
  • Yonsei University
  • Texas Tech University
  • The Dutch Research Council
  • Seoul National University
  • University of New Mexico
  • University of Central Lancashire
  • Brandeis University
  • Huazhong University of Science and Technology
  • University College London
  • University of Chinese Academy of Sciences
  • University of Science and Technology of China
  • Bard College

Research output: Contribution to journalArticlepeer-review

43 Scopus citations

Abstract

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 Array (April 3), and the Very Long Baseline Array (April 28), giving a novel view of the source at four observing frequencies, 230, 86, 8.7, and 2.3 GHz. These observations probe jet properties from the subparsec to 100 pc scales. We combine the multifrequency images of J1924–2914 to study the source morphology. We find that the jet exhibits a characteristic bending, with a gradual clockwise rotation of the jet projected position angle of about 90° between 2.3 and 230 GHz. Linearly polarized intensity images of J1924–2914 with the extremely fine resolution of the EHT provide evidence for ordered toroidal magnetic fields in the blazar compact core.

Original languageEnglish
Article number145
JournalAstrophysical Journal
Volume934
Issue number2
DOIs
StatePublished - 1 Aug 2022

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