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
Radboud University
National Aeronautics and Space Administration (NASA)
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
National Astronomical Observatory of Japan
Massachusetts Institute of Technology (MIT)
Harvard University
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
European Southern Observatory (ESO)
Aalto University
Mikhail Lisakov
Max Planck Society
Antonio Fuentes
Spanish National Research Council (CSIC)
Guang-Yao Zhao
Spanish National Research Council (CSIC)
Kotaro Moriyama
National Astronomical Observatory of Japan
Massachusetts Institute of Technology (MIT)
Goethe University Frankfurt
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
Columbia University
Flatiron Institute
Radboud University
Mark Gurwell
Harvard-Smithsonian Center for Astrophysics
Ru-Sen Lu
Max Planck Society
Chinese Academy of Sciences
Antxon Alberdi
Spanish National Research Council (CSIC)
Walter Alef
Max Planck Society
Juan Carlos Algaba
University of Malaya
Richard Anantua
University of Texas
Harvard University
Harvard-Smithsonian Center for Astrophysics
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
Fermi National Accelerator Laboratory
University of Chicago
Dan Bintley
East Asian Observatory
James Clerk Maxwell Telescope
Raymond Blundell
Harvard-Smithsonian Center for Astrophysics
Wilfred Boland
NOVA
Katherine L. Bouman
California Institute of Technology (Caltech)
Geoffrey C. Bower
Academia Sinica
University of Hawaii
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-Smithsonian Center for Astrophysics
Harvard University
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
National Institute for Nuclear Physics
University of Naples Federico II
Goethe University Frankfurt
Roger Deane
University of Witwatersrand
University of Pretoria
Rhodes University
Jessica Dempsey
East Asian Observatory
James Clerk Maxwell Telescope
Netherlands Institute for Radio Astronomy (ASTRON)
Gregory Desvignes
Paris Descartes University
Jason Dexter
University of Colorado
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
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
Massachusetts Institute of Technology (MIT)
Google Inc.
Per Friberg
James Clerk Maxwell Telescope
East Asian Observatory
Christian M. Fromm
University of Würzburg
Goethe University Frankfurt
Max Planck Society
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
University of Cagliari
Istituto nazionale di astrofisica (INAF)
Roman Gold
Goethe University Frankfurt
University of Southern Denmark
Gomez-Ruiz
National Council for Science and Technology Mexico
National Institute of Astrophysics, Optics and Electronics
Minfeng Gu
Chinese Academy of Sciences
Kazuhiro Hada
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
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
James Clerk Maxwell Telescope
Academia Sinica
Mareki Honma
National Astronomical Observatory of Japan
University of Tokyo
The Graduate University for Advanced Studies (SOKENDAI)
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
National Astronomical Observatory of Japan
The Institute of Statistical Mathematics
The Graduate University for Advanced Studies (SOKENDAI)
C. M. Violette Impellizzeri
Leiden University
National Radio Astronomy Observatory
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-Smithsonian Center for Astrophysics
Harvard University
Joshi
University of Illinois
Taehyun Jung
Korea Astronomy and Space Science Institute
University of Science and Technology (UST)
Mansour Karami
Perimeter Institute for Theoretical Physics
University of Waterloo
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
Korea Astronomy and Space Science Institute
Max Planck Society
East Asian Observatory
James Clerk Maxwell Telescope
Jongsoo Kim
Korea Astronomy and Space Science Institute
Junhan Kim
California Institute of Technology (Caltech)
University of Arizona
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
National Sun Yat-Sen University
Academia Sinica
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
James Clerk Maxwell Telescope
Chinese Academy of Sciences
East Asian Observatory
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
Institute for Advanced Study
University of Arizona
Karl M. Menten
Max Planck Society
Daniel Michalik
University of Chicago
European Space Agency (ESA)
Izumi Mizuno
East Asian Observatory
James Clerk Maxwell Telescope
James M. Moran
Harvard-Smithsonian Center for Astrophysics
Harvard University
Cornelia Mueller
Radboud University
Max Planck Society
Alejandro Mus
Universitat de Valencia
Gibwa Musoke
Radboud University
University of Amsterdam
Ioannis Myserlis
Instituto de Radioastronomía Milimétrica
Andrew Nadolski
University of Illinois
Hiroshi Nagai
National Astronomical Observatory of Japan
The Graduate University for Advanced Studies (SOKENDAI)
Neil M. Nagar
University of Concepcion
Masanori Nakamura
Academia Sinica
National Institute of Technology (KOSEN)
Ramesh Narayan
Harvard University
Harvard-Smithsonian Center for Astrophysics
Gopal Narayanan
University of Massachusetts
Iniyan Natarajan
National Institute for Nuclear Physics
South African Radio Astronomy Observatory (SARAO)
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
National Astronomical Observatory of Japan
University of Tokyo
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-Smithsonian Center for Astrophysics
Harvard University
Georgios Filippos Paraschos
Max Planck Society
Jongho Park
Academia Sinica
Harriet Parsons
James Clerk Maxwell Telescope
East Asian Observatory
Nimesh Patel
Harvard-Smithsonian Center for Astrophysics
Ue-Li Pen
University of Toronto
Academia Sinica
Perimeter Institute for Theoretical Physics
Canadian Institute for Advanced Research
Vincent Pietu
Institut de Radioastronomie Millimétrique (IRAM)
Richard Plambeck
University of California
Aleksandar PopStefanija
University of Massachusetts
Oliver Porth
Goethe University Frankfurt
University of Amsterdam
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
James Clerk Maxwell Telescope
NSF's National Optical-Infrared Astronomy Research Laboratory (NOIRLab)
East Asian Observatory
Alexander W. Raymond
Harvard-Smithsonian Center for Astrophysics
Harvard University
Luciano Rezzolla
Goethe University Frankfurt
Frankfurt Institute for Advanced Studies
Trinity College Dublin
Angelo Ricarte
Harvard-Smithsonian Center for Astrophysics
Harvard University
Bart Ripperda
Princeton University
Flatiron Institute
Freek Roelofs
Harvard University
Harvard-Smithsonian Center for Astrophysics
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 Institute of Astrophysics, Optics and Electronics
National Council for Science and Technology Mexico
Miguel Sanchez-Portal
Instituto de Radioastronomía Milimétrica
Mahito Sasada
National Astronomical Observatory of Japan
Hiroshima University
Kaushik Satapathy
University of Arizona
Tuomas Savolainen
Max Planck Society
Aalto University
F. Peter Schloerb
University of Massachusetts
Karl-Friedrich Schuster
Institut de Radioastronomie Millimétrique (IRAM)
Lijing Shao
Beijing University of Technology
Max Planck Society
Zhiqiang Shen
Chinese Academy of Sciences
James Clerk Maxwell Telescope
East Asian Observatory
Des Small
Joint Institute for VLBI in Europe (JIVE)
Bong Won Sohn
James Clerk Maxwell Telescope
East Asian Observatory
Korea Astronomy and Space Science Institute
Yonsei University
University of Science and Technology (UST)
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
Texas Tech University
National Aeronautics and Space Administration (NASA)
Remo P. J. Tilanus
Netherlands Organisation for Scientific Research (NWO)
University of Arizona
Radboud University
Leiden University
Michael Titus
Massachusetts Institute of Technology (MIT)
Pablo Torne
Max Planck Society
Instituto de Radioastronomía Milimétrica
Tyler Trent
University of Arizona
Sascha Trippe
James Clerk Maxwell Telescope
East Asian Observatory
Seoul National University
Ilse van Bemmel
Joint Institute for VLBI in Europe (JIVE)
Huib Jan van Langevelde
Joint Institute for VLBI in Europe (JIVE)
Leiden University
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
University College London (UCL)
Goethe University Frankfurt
Feng Yuan
James Clerk Maxwell Telescope
Chinese Academy of Sciences
East Asian Observatory
Ye-Fei Yuan
James Clerk Maxwell Telescope
University of Science and Technology of China
East Asian Observatory
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