GMVA22B-100

A Multicolor View of the Black Hole Environment in M87

Abstract

Recent Event Horizon Telescope (EHT) observations of M87 have revealed a ring-like structure near the event horizon at 230 GHz. This structure was interpreted as a photon ring surrounding a dark shadow caused by gravitational light bending and the photon capture at the event horizon. However, the origin of the ring needs to be better understood. Photons that are not entirely bound by black hole gravity, such as the emission from plasma located further away from the photon capture radius, may also contribute to the observed ring. Our recent GMVA+ALMA observations of M87 at 86 GHz indicate that a ring-like structure may exist in the core of M87 at this frequency as well. Here we propose further confirmation and refinement of the ring properties through new observations of M87 using the GMVA+ALMA in 2023. Also in 2023, EHT+ALMA observations at both 230 and 345 GHz will be performed for the first time. These observations will provide a multicolor view of the black hole environment in M87, allowing us to investigate the origin of the ring, the physical properties of plasmas in the innermost accretion flows and jets, and the magnetic field structure and Faraday rotation of the ring.

Investigators

Name	Institution
Jongho Park *	Kyung Hee University
Keiichi Asada	Academia Sinica
Masanori Nakamura	Academia Sinica; National Institute of Technology, Hachinohe College
Hung-Yi Pu	Perimeter Institute for Theoretical Physics
Rusen Lu	Max-Planck-Institut für Radioastronomie; Shanghai Astronomical Observatory, CAS
Thomas Krichbaum	Max-Planck-Institut für Radioastronomie
Tomohisa Kawashima	Tokyo, University of
Jose L. Gomez	Andalucía, Instituto de Astrofísica de
Feng Yuan	Shanghai Astronomical Observatory, CAS
Jae-Young Kim	Max-Planck-Institut für Radioastronomie; Kyungpook National University
Kazuhiro Hada	Istituto Nazionale di Astrofisica; National Astronomical Observatory of Japan ; Nagoya City University
Fumie Tazaki	National Astronomical Observatory of Japan ; Tokyo Electron Technology Solutions Ltd.
Ivan Marti-Vidal	València, Universitat de
Andrei Lobanov	Max-Planck-Institut für Radioastronomie
Kazunori Akiyama	Massachusetts Institute of Technology; Haystack Observatory
Lindy Blackburn	Center for Astrophysics | Harvard & Smithsonian
Katherine Bouman	Massachusetts Institute of Technology; California Institute of Technology
Geoffrey Bower	Academia Sinica
Silke Britzen	Max-Planck-Institut für Radioastronomie
Michael Bremer	Institut de Radio Astronomique Millimétrique
Avery Broderick	Waterloo, University of
Sunil Chandra	North-West University
Ilje Cho	Korea Astronomy and Space Science Institute; Andalucía, Instituto de Astrofísica de; Korea University of Science and Technology
Geoffrey Crew	Massachusetts Institute of Technology
Shep Doeleman	Center for Astrophysics | Harvard & Smithsonian
Akihiro Doi	Japan Aerospace Exploration Agency
Heino Falcke	Netherlands Institute for Radio Astronomy; Nijmegen, Radboud Universiteit
Vincent Fish	Haystack Observatory
Gabriele Giovannini	Istituto Nazionale di Astrofisica
Marcello Giroletti	Istituto Nazionale di Astrofisica
Jordy Davelaar	Columbia University
Paul Ho	Academia Sinica; East Asian Observatory
Mareki Honma	National Astronomical Observatory of Japan
David Hughes	Astrofísica, Óptica y Electrónica, Instituto Nacional de
Violette Impellizzeri	National Radio Astronomy Observatory; Leiden, University of; Joint ALMA Observatory
Makoto Inoue	Academia Sinica
Sara Issaoun	Center for Astrophysics | Harvard & Smithsonian; Nijmegen, Radboud Universiteit
David James	Smithsonian Astrophysical Observatory
Michael Janssen	Max-Planck-Institut für Radioastronomie; Nijmegen, Radboud Universiteit
Wu Jiang	Shanghai Astronomical Observatory, CAS
Michael Johnson	California at Santa Barbara, University of; Center for Astrophysics | Harvard & Smithsonian
Motoki Kino	National Astronomical Observatory of Japan ; Korea Astronomy and Space Science Institute
Shoko Koyama	National Astronomical Observatory of Japan ; Academia Sinica
Michael Lindqvist	Chalmers University of Technology
Elisabetta Liuzzo	Istituto Nazionale di Astrofisica
Laurent Loinard	México, Universidad Nacional Autónoma de
Nicholas MacDonald	Boston University; Max-Planck-Institut für Radioastronomie; Mississippi, University of
Sera Markoff	Amsterdam, Universiteit van
Alan Marscher	Boston University
Satoki Matsushita	Academia Sinica
Hugo Messias	Joint ALMA Observatory
Monika Moscibrodzka	Nijmegen, Radboud Universiteit
Shin Mineshige	Kyoto University
Yosuke Mizuno	Shanghai Jiao Tong University; Frankfurt am Main, Goethe-Universität
Hiroshi Nagai	National Astronomical Observatory of Japan ; Japan Aerospace Exploration Agency
Gopal Narayanan	Massachusetts at Amherst, University of
Monica Orienti	Istituto Nazionale di Astrofisica; Bologna, Universita degli Studi di
Yurii Pidopryhora	Max-Planck-Institut für Radioastronomie
Oliver Porth	Amsterdam, Universiteit van; Frankfurt am Main, Goethe-Universität
Luciano Rezzolla	Frankfurt am Main, Goethe-Universität
Eduardo Ros	Max-Planck-Institut für Radioastronomie; València, Universitat de
Helge Rottmann	Max-Planck-Institut für Radioastronomie
Kazi Rygl	Istituto Nazionale di Astrofisica
David Sanchez-Arguelles	Astrofísica, Óptica y Electrónica, Instituto Nacional de
Tuomas Savolainen	Max-Planck-Institut für Radioastronomie; Aalto yliopisto
Karl Schuster	Institut de Radio Astronomique Millimétrique
zhi-qiang shen	Shanghai Astronomical Observatory, CAS
Kenji Toma	Tohoku University
Pablo de Vicente	Yebes, Centro Astronómico de
John Wardle	Brandeis University
Maciek Wielgus	Max-Planck-Institut für Radioastronomie; Smithsonian Astrophysical Observatory
Tony Zensus	National Radio Astronomy Observatory; Max-Planck-Institut für Radioastronomie
Uwe Bach	Max-Planck-Institut für Radioastronomie
Lynn Matthews	Haystack Observatory; Center for Astrophysics | Harvard & Smithsonian
Noemi La Bella	Nijmegen, Radboud Universiteit
Yuzhu Cui	Zhejiang Lab
GBT Operator	Green Bank Observatory

* indicates the PI