Resolving the Inner Parsec of the Blazar J1924-2914 with the Event Horizon Telescope
Journal article, 2022
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 mu as 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 degrees 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.
Author
Sara Issaoun
Harvard-Smithsonian Center for Astrophysics
National Aeronautics and Space Administration (NASA)
Radboud University
Maciek Wielgus
Max Planck Society
Svetlana Jorstad
Boston University
Thomas P. Krichbaum
Max Planck Society
Lindy Blackburn
Harvard University
Harvard-Smithsonian Center for Astrophysics
Michael Janssen
Max Planck Society
Chi-kwan Chan
University of Arizona
Dominic W. Pesce
Harvard University
Harvard-Smithsonian Center for Astrophysics
Jose L. Gomez
Spanish National Research Council (CSIC)
Kazunori Akiyama
Harvard University
Massachusetts Institute of Technology (MIT)
National Astronomical Observatory of Japan
Monika Moscibrodzka
Radboud University
Ivan Marti-Vidal
Universitat de Valencia
Andrew Chael
National Aeronautics and Space Administration (NASA)
Princeton University
Rocco Lico
Spanish National Research Council (CSIC)
Istituto nazionale di astrofisica (INAF)
Max Planck Society
Jun Liu
Max Planck Society
Venkatessh Ramakrishnan
University of Concepcion
Aalto University
European Southern Observatory (ESO)
Mikhail Lisakov
Max Planck Society
Antonio Fuentes
Spanish National Research Council (CSIC)
Guang-Yao Zhao
Spanish National Research Council (CSIC)
Kotaro Moriyama
Goethe University Frankfurt
Massachusetts Institute of Technology (MIT)
National Astronomical Observatory of Japan
Avery E. Broderick
University of Waterloo
Perimeter Institute for Theoretical Physics
Paul Tiede
Harvard University
Harvard-Smithsonian Center for Astrophysics
Nicholas R. MacDonald
Max Planck Society
Yosuke Mizuno
Shanghai Jiao Tong University
Goethe University Frankfurt
Efthalia Traianou
Spanish National Research Council (CSIC)
Max Planck Society
Laurent Loinard
Universidad Nacional Autónoma de México
Jordy Davelaar
Radboud University
Columbia University
Flatiron Institute
Mark Gurwell
Harvard-Smithsonian Center for Astrophysics
Ru-Sen Lu
Chinese Academy of Sciences
Max Planck Society
Antxon Alberdi
Spanish National Research Council (CSIC)
Walter Alef
Max Planck Society
Juan Carlos Algaba
University of Malaya
Richard Anantua
Harvard-Smithsonian Center for Astrophysics
Harvard University
University of Texas at San Antonio
Keiichi Asada
Academia Sinica
Rebecca Azulay
Max Planck Society
Universitat de Valencia
Uwe Bach
Max Planck Society
Anne-Kathrin Baczko
Max Planck Society
David Ball
University of Arizona
Mislac Balokovic
Yale University
John Barrett
Massachusetts Institute of Technology (MIT)
Michi Baubock
University of Illinois
Bradford A. Benson
University of Chicago
Fermi National Accelerator Laboratory
Dan Bintley
East Asian Observatory
James Clerk Maxwell Telescope
Raymond Blundell
Harvard-Smithsonian Center for Astrophysics
Wilfred Boland
Nederlandse Onderzoekschool voor Astronomie (NOVA)
Katherine L. Bouman
California Institute of Technology (Caltech)
Geoffrey C. Bower
University of Hawaii
Academia Sinica
Hope Boyce
McGill University
Michael Bremer
Institut de Radioastronomie Millimétrique (IRAM)
Christiaan D. Brinkerink
Radboud University
Roger Brissenden
Harvard-Smithsonian Center for Astrophysics
Harvard University
Silke Britzen
Max Planck Society
Dominique Broguiere
Institut de Radioastronomie Millimétrique (IRAM)
Thomas Bronzwaer
Radboud University
Sandra Bustamante
University of Massachusetts
Do-Young Byun
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
John E. Carlstrom
University of Chicago
Chiara Ceccobello
Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics
Koushik Chatterjee
Harvard University
Harvard-Smithsonian Center for Astrophysics
Shami Chatterjee
Cornell University
Ming-Tang Chen
Academia Sinica
Yongjun Chen
Chinese Academy of Sciences
Ilje Cho
Spanish National Research Council (CSIC)
Pierre Christian
Fairfield University
Nicholas S. Conroy
University of Illinois
Harvard-Smithsonian Center for Astrophysics
John Conway
Chalmers, Space, Earth and Environment, Onsala Space Observatory
James M. Cordes
Cornell University
Thomas M. Crawford
University of Chicago
Geoffrey B. Crew
Massachusetts Institute of Technology (MIT)
Alejandro Cruz-Osorio
Goethe University Frankfurt
Yuzhu Cui
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Mariafelicia De Laurentis
University of Naples Federico II
National Institute for Nuclear Physics
Goethe University Frankfurt
Roger Deane
Rhodes University
University of Pretoria
University of Witwatersrand
Jessica Dempsey
Netherlands Institute for Radio Astronomy (ASTRON)
James Clerk Maxwell Telescope
East Asian Observatory
Gregory Desvignes
Paris Descartes University
Jason Dexter
University of Colorado at Boulder
Sheperd S. Doeleman
Harvard University
Harvard-Smithsonian Center for Astrophysics
Vedant Dhruv
University of Illinois
Sergio Abraham Dzib Quijano
Max Planck Society
Institut de Radioastronomie Millimétrique (IRAM)
Ralph P. Eatough
Max Planck Society
Chinese Academy of Sciences
Razieh Emami
Harvard-Smithsonian Center for Astrophysics
Heino Falcke
Radboud University
Joseph Farah
Las Cumbres Observatory Global Telescope Network
University of California at Santa Barbara
Vincent L. Fish
Massachusetts Institute of Technology (MIT)
Ed Fomalont
National Radio Astronomy Observatory
H. Alyson Ford
University of Arizona
Raquel Fraga-Encinas
Radboud University
William T. Freeman
Google Inc.
Massachusetts Institute of Technology (MIT)
Per Friberg
East Asian Observatory
James Clerk Maxwell Telescope
Christian M. Fromm
Max Planck Society
Goethe University Frankfurt
University of Würzburg
Peter Galison
Harvard University
Charles F. Gammie
University of Illinois
Roberto Garcia
Institut de Radioastronomie Millimétrique (IRAM)
Olivier Gentaz
Institut de Radioastronomie Millimétrique (IRAM)
Boris Georgiev
University of Waterloo
Perimeter Institute for Theoretical Physics
Ciriaco Goddi
Istituto nazionale di astrofisica (INAF)
University of Cagliari
Roman Gold
University of Southern Denmark
Goethe University Frankfurt
Gomez-Ruiz
National Institute of Astrophysics, Optics and Electronics
National Council for Science and Technology Mexico
Minfeng Gu
Chinese Academy of Sciences
Kazuhiro Hada
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Daryl Haggard
McGill University
Michael H. Hecht
Massachusetts Institute of Technology (MIT)
Ronald Hesper
University of Groningen
Luis C. Ho
Beijing University of Technology
Paul Ho
Academia Sinica
James Clerk Maxwell Telescope
Mareki Honma
University of Tokyo
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Chih-Wei L. Huang
Academia Sinica
Lei Huang
Chinese Academy of Sciences
David H. Hughes
National Institute of Astrophysics, Optics and Electronics
Shiro Ikeda
University of Tokyo
The Graduate University for Advanced Studies (SOKENDAI)
The Institute of Statistical Mathematics
National Astronomical Observatory of Japan
C. M. Violette Impellizzeri
National Radio Astronomy Observatory
Leiden University
Makoto Inoue
Academia Sinica
David J. James
ASTRAVEO
Buell T. Jannuzi
University of Arizona
Britton Jeter
Academia Sinica
Wu Jiang
Chinese Academy of Sciences
Alejandra Jimenez-Rosales
Radboud University
Michael D. Johnson
Harvard University
Harvard-Smithsonian Center for Astrophysics
Joshi
University of Illinois
Taehyun Jung
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Mansour Karami
University of Waterloo
Perimeter Institute for Theoretical Physics
Ramesh Karuppusamy
Max Planck Society
Tomohisa Kawashima
University of Tokyo
Garrett K. Keating
Harvard-Smithsonian Center for Astrophysics
Mark Kettenis
Joint Institute for VLBI in Europe (JIVE)
Dong-Jin Kim
Max Planck Society
Jae-Young Kim
James Clerk Maxwell Telescope
East Asian Observatory
Max Planck Society
Korea Astronomy and Space Science Institute
Jongsoo Kim
Korea Astronomy and Space Science Institute
Junhan Kim
University of Arizona
California Institute of Technology (Caltech)
Motoki Kino
National Astronomical Observatory of Japan
Kogakuin University of Technology and Engineering
Jun Yi Koay
Academia Sinica
Prashant Kocherlakota
Goethe University Frankfurt
Yutaro Kofuji
University of Tokyo
National Astronomical Observatory of Japan
Patrick M. Koch
Academia Sinica
Shoko Koyama
Niigata University
Academia Sinica
Carsten Kramer
Institut de Radioastronomie Millimétrique (IRAM)
Michael Kramer
Max Planck Society
Cheng-Yu Kuo
Academia Sinica
National Sun Yat-Sen University
Noemi La Bella
Radboud University
Tod R. Lauer
National Optical Astronomy Observatory
Daeyoung Lee
University of Illinois
Sang-Sung Lee
Korea Astronomy and Space Science Institute
Po Kin Leung
Chinese University of Hong Kong
Aviad Levis
California Institute of Technology (Caltech)
Zhiyuan Li
Nanjing University
Greg Lindahl
Harvard-Smithsonian Center for Astrophysics
Michael Lindqvist
Chalmers, Space, Earth and Environment, Onsala Space Observatory
Kuo Liu
Max Planck Society
Elisabetta Liuzzo
Istituto nazionale di astrofisica (INAF)
Wen-Ping Lo
Academia Sinica
National Taiwan University
Andrei P. Lobanov
Max Planck Society
Colin Lonsdale
Massachusetts Institute of Technology (MIT)
Jirong Mao
East Asian Observatory
Chinese Academy of Sciences
James Clerk Maxwell Telescope
Nicola Marchili
Max Planck Society
Istituto nazionale di astrofisica (INAF)
Sera Markoff
University of Amsterdam
Daniel P. Marrone
University of Arizona
Alan P. Marscher
Boston University
Satoki Matsushita
Academia Sinica
Lynn D. Matthews
Massachusetts Institute of Technology (MIT)
Lia Medeiros
University of Arizona
Institute for Advanced Study
Karl M. Menten
Max Planck Society
Daniel Michalik
University of Chicago
European Space Research and Technology Centre (ESA ESTEC)
Izumi Mizuno
East Asian Observatory
James Clerk Maxwell Telescope
James M. Moran
Harvard University
Harvard-Smithsonian Center for Astrophysics
Cornelia Mueller
Radboud University
Max Planck Society
Alejandro Mus
Universitat de Valencia
Gibwa Musoke
University of Amsterdam
Radboud University
Ioannis Myserlis
Instituto de Radioastronomía Milimétrica
Andrew Nadolski
University of Illinois
Hiroshi Nagai
The Graduate University for Advanced Studies (SOKENDAI)
National Astronomical Observatory of Japan
Neil M. Nagar
University of Concepcion
Masanori Nakamura
National Institute of Technology, Hachinohe College
Academia Sinica
Ramesh Narayan
Harvard University
Harvard-Smithsonian Center for Astrophysics
Gopal Narayanan
University of Massachusetts
Iniyan Natarajan
South African Radio Astronomy Observatory (SARAO)
National Institute for Nuclear Physics
Antonios Nathanail
National and Kapodistrian University of Athens
Goethe University Frankfurt
Joseph Neilsen
Villanova University
Roberto Neri
Institut de Radioastronomie Millimétrique (IRAM)
Chunchong Ni
University of Waterloo
Perimeter Institute for Theoretical Physics
Aristeidis Noutsos
Max Planck Society
Michael A. Nowak
Washington University in St. Louis
Junghwan Oh
Sejong University
Hiroki Okino
University of Tokyo
National Astronomical Observatory of Japan
Hector Olivares
Radboud University
Gisela N. Ortiz-Leon
Max Planck Society
Tomoaki Oyama
National Astronomical Observatory of Japan
Feryal Ozel
University of Arizona
Daniel C. M. Palumbo
Harvard University
Harvard-Smithsonian Center for Astrophysics
Georgios Filippos Paraschos
Max Planck Society
Jongho Park
Academia Sinica
Harriet Parsons
East Asian Observatory
James Clerk Maxwell Telescope
Nimesh Patel
Harvard-Smithsonian Center for Astrophysics
Ue-Li Pen
Canadian Institute for Advanced Research
Academia Sinica
University of Toronto
Perimeter Institute for Theoretical Physics
Vincent Pietu
Institut de Radioastronomie Millimétrique (IRAM)
Richard Plambeck
University of California at Berkeley
Aleksandar PopStefanija
University of Massachusetts
Oliver Porth
University of Amsterdam
Goethe University Frankfurt
Felix M. Potzl
University College Cork
Max Planck Society
Ben Prather
University of Illinois
Jorge A. Preciado-Lopez
Perimeter Institute for Theoretical Physics
Dimitrios Psaltis
University of Arizona
Hung-Yi Pu
National Taiwan Normal University
Academia Sinica
Ramprasad Rao
Academia Sinica
Mark G. Rawlings
NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab)
James Clerk Maxwell Telescope
East Asian Observatory
Alexander W. Raymond
Harvard University
Harvard-Smithsonian Center for Astrophysics
Luciano Rezzolla
Goethe University Frankfurt
Trinity College Dublin
Frankfurt Institute for Advanced Studies
Angelo Ricarte
Harvard-Smithsonian Center for Astrophysics
Harvard University
Bart Ripperda
Princeton University
Flatiron Institute
Freek Roelofs
Harvard-Smithsonian Center for Astrophysics
Harvard University
Radboud University
Alan Rogers
Massachusetts Institute of Technology (MIT)
Eduardo Ros
Max Planck Society
Cristina Romero-Canizales
Academia Sinica
Arash Roshanineshat
University of Arizona
Helge Rottmann
Max Planck Society
Alan L. Roy
Max Planck Society
Ignacio Ruiz
Instituto de Radioastronomía Milimétrica
Chet Ruszczyk
Massachusetts Institute of Technology (MIT)
Kazi L. J. Rygl
Istituto nazionale di astrofisica (INAF)
Salvador Sanchez
Instituto de Radioastronomía Milimétrica
David Sanchez-Arguelles
National Council for Science and Technology Mexico
National Institute of Astrophysics, Optics and Electronics
Miguel Sanchez-Portal
Instituto de Radioastronomía Milimétrica
Mahito Sasada
Hiroshima University
National Astronomical Observatory of Japan
Kaushik Satapathy
University of Arizona
Tuomas Savolainen
Aalto University
Max Planck Society
F. Peter Schloerb
University of Massachusetts
Karl-Friedrich Schuster
Institut de Radioastronomie Millimétrique (IRAM)
Lijing Shao
Max Planck Society
Beijing University of Technology
Zhiqiang Shen
Chinese Academy of Sciences
East Asian Observatory
James Clerk Maxwell Telescope
Des Small
Joint Institute for VLBI in Europe (JIVE)
Bong Won Sohn
James Clerk Maxwell Telescope
Yonsei University
East Asian Observatory
University of Science and Technology (UST)
Korea Astronomy and Space Science Institute
Jason SooHoo
Massachusetts Institute of Technology (MIT)
Kamal Souccar
University of Massachusetts
He Sun
California Institute of Technology (Caltech)
Fumie Tazaki
National Astronomical Observatory of Japan
Alexandra J. Tetarenko
National Aeronautics and Space Administration (NASA)
Texas Tech University at Lubbock
Remo P. J. Tilanus
University of Arizona
Radboud University
Leiden University
Netherlands Organisation for Scientific Research (NWO)
Michael Titus
Massachusetts Institute of Technology (MIT)
Pablo Torne
Max Planck Society
Instituto de Radioastronomía Milimétrica
Tyler Trent
University of Arizona
Sascha Trippe
East Asian Observatory
Seoul National University
James Clerk Maxwell Telescope
Ilse van Bemmel
Joint Institute for VLBI in Europe (JIVE)
Huib Jan van Langevelde
Leiden University
Joint Institute for VLBI in Europe (JIVE)
University of New Mexico
Daniel R. van Rossum
Radboud University
Jesse Vos
Radboud University
Jan Wagner
Max Planck Society
Derek Ward-Thompson
University of Central Lancashire
John Wardle
Brandeis University
Jonathan Weintroub
Harvard-Smithsonian Center for Astrophysics
Harvard University
Norbert Wex
Max Planck Society
Robert Wharton
Max Planck Society
Kaj Wiik
University of Turku
Gunther Witzel
Max Planck Society
Michael Wondrak
Radboud University
George N. Wong
Institute for Advanced Study
Princeton University
Qingwen Wu
James Clerk Maxwell Telescope
East Asian Observatory
Huazhong University of Science and Technology
Paul Yamaguchi
Harvard-Smithsonian Center for Astrophysics
Doosoo Yoon
University of Amsterdam
Andre Young
Radboud University
Ken Young
Harvard-Smithsonian Center for Astrophysics
Ziri Younsi
Goethe University Frankfurt
University College London (UCL)
Feng Yuan
Chinese Academy of Sciences
James Clerk Maxwell Telescope
East Asian Observatory
Ye-Fei Yuan
East Asian Observatory
University of Science and Technology of China
James Clerk Maxwell Telescope
J. Anton Zensus
Max Planck Society
Shuo Zhang
Bard College
Shan-Shan Zhao
Chinese Academy of Sciences
Astrophysical Journal
0004-637X (ISSN) 1538-4357 (eISSN)
Vol. 934 2 145Subject Categories (SSIF 2011)
Meteorology and Atmospheric Sciences
Astronomy, Astrophysics and Cosmology
Fusion, Plasma and Space Physics
DOI
10.3847/1538-4357/ac7a40