GMVA23B-152

Imaging supermassive binary black hole candidate OJ287 with GMVA+ALMA

Abstract

We propose new 3 mm GMVA+ALMA observations of the inner jet of OJ 287 in April 2024. OJ287 is one of the best candidates for hosting a sub-pc separation supermassive binary black hole system (SMBBH), which are prime targets for future nano- and milli-hertz gravitational wave detectors. The expected separation between the two SMBHs will reach the maximum in 2024. The larger projected separation, together with the improved array capability in 2024, will provide a unique opportunity to test SMBBH models proposed for this source. Combined with previous data taken during 2017-2022, the proposed observations will also enable us to measure the temporal evolution of the innermost jet position angle over a timescale that is more than half of the orbital period and provide insights into the dynamics of the proposed SMBBH system. Along with the to be proposed EHT 1.3 mm & 0.8 mm observations, we will analyze the structure of the magnetic field, and probe the Faraday screen of the accretion flow around the SMBH and across the inner jet.

Investigators

Name	Institution
Laurent Loinard	México, Universidad Nacional Autónoma de
Marianna Foschi	Andalucía, Instituto de Astrofísica de
Teresa Toscano	Andalucía, Instituto de Astrofísica de
Rohan Dahale	Andalucía, Instituto de Astrofísica de
Abhimanyu Susobhanan	Tata Institute of Fundamental Research
Ilje Cho	Korea Astronomy and Space Science Institute; Andalucía, Instituto de Astrofísica de; Korea University of Science and Technology
Jun Yi Koay	Academia Sinica
Jongho Park	Kyung Hee University
Hugo Messias	Joint ALMA Observatory
Violette Impellizzeri	National Radio Astronomy Observatory; Leiden, University of; Joint ALMA Observatory
Shoko Koyama	National Astronomical Observatory of Japan ; Academia Sinica
Lankeswar Dey	Tata Institute of Fundamental Research
A Gopakumar	Tata Institute of Fundamental Research
Rocco Lico	Istituto Nazionale di Astrofisica; Max-Planck-Institut für Radioastronomie; Andalucía, Instituto de Astrofísica de
Venkatessh Ramakrishnan	Turku, University of
Lindy Blackburn	Center for Astrophysics | Harvard & Smithsonian
Keiichi Asada	Academia Sinica
Michael Janssen	Max-Planck-Institut für Radioastronomie; Nijmegen, Radboud Universiteit
Sara Issaoun	Center for Astrophysics | Harvard & Smithsonian; Nijmegen, Radboud Universiteit
Efthalia Traianou	Max-Planck-Institut für Radioastronomie; Köln, Universität zu; Andalucía, Instituto de Astrofísica de
Tuomas Savolainen	Max-Planck-Institut für Radioastronomie; Aalto yliopisto
Helge Rottmann	Max-Planck-Institut für Radioastronomie
Tony Zensus	National Radio Astronomy Observatory; Max-Planck-Institut für Radioastronomie
Geoffrey Crew	Massachusetts Institute of Technology
Rusen Lu	Max-Planck-Institut für Radioastronomie; Shanghai Astronomical Observatory, CAS
Silke Britzen	Max-Planck-Institut für Radioastronomie
Eduardo Ros	Max-Planck-Institut für Radioastronomie; València, Universitat de
Manel Perucho	València, Universitat de
Jos M. Mart	València, Universitat de
Yosuke Mizuno	Shanghai Jiao Tong University; Frankfurt am Main, Goethe-Universität
Uwe Bach	Max-Planck-Institut für Radioastronomie
Brissa Gomez-Miller	México, Universidad Nacional Autónoma de
Sera Markoff	Amsterdam, Universiteit van
Michael Johnson	California at Santa Barbara, University of; Center for Astrophysics | Harvard & Smithsonian
Kazunori Akiyama	Massachusetts Institute of Technology; Haystack Observatory
Roman Gold	Maryland, University of; Perimeter Institute for Theoretical Physics; Syddansk Universitet
Jeffrey Hodgson	Max-Planck-Institut für Radioastronomie; Korea Astronomy and Space Science Institute
Ivan Marti-Vidal	València, Universitat de
Jae-Young Kim	Max-Planck-Institut für Radioastronomie; Kyungpook National University
Yuri Kovalev	Max-Planck-Institut für Radioastronomie
Gabriele Bruni	Istituto Nazionale di Astrofisica
Svetlana Jorstad	Boston University
Alan Marscher	Boston University
Stefanie Komossa	Max-Planck-Institut für Radioastronomie
Antonio Fuentes	Andalucía, Instituto de Astrofísica de
Guangyao Zhao	Max-Planck-Institut für Radioastronomie; Korea Astronomy and Space Science Institute; Andalucía, Instituto de Astrofísica de
Thomas Krichbaum	Max-Planck-Institut für Radioastronomie
Jose L. Gomez *	Andalucía, Instituto de Astrofísica de

* indicates the PI