Статья

Unraveling the Innermost Jet Structure of OJ 287 with the First GMVA + ALMA Observations

Guang-Yao ZhaoInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; [email protected]José L. GómezInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; [email protected]Antonio FuentesInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; [email protected]T. P. KrichbaumMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanyEfthalia TraianouInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; [email protected]Rocco LicoINAF-Istituto di Radioastronomia, Via P. Gobetti 101, I-40129 Bologna, ItalyIlje ChoInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; [email protected]E. RosMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanyS. KomossaMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanyKazunori AkiyamaBlack Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USAKeiichi AsadaInstitute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.CLindy BlackburnBlack Hole Initiative at Harvard University, 20 Garden Street, Cambridge, MA 02138, USAS. BritzenMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanyG. BruniINAF—Istituto di Astrofisica e Planetologia Spaziali, via Fosso del Cavaliere 100, I-00133 Roma, ItalyG. CrewMassachusetts Institute of Technology Haystack Observatory, 99 Millstone Road, Westford, MA 01886, USARohan DahaleIndian Institute of Science Education and Research Kolkata, Mohanpur, Nadia, West Bengal 741246, IndiaLankeswar DeyDepartment of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, IndiaRoman GoldCP3-Origins, University of Southern Denmark, Campusvej 55, DK-5230 Odense M, DenmarkA. GopakumarDepartment of Astronomy and Astrophysics, Tata Institute of Fundamental Research, Mumbai 400005, IndiaSara IssaounCenter for Astrophysics ∣ Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USAMichaël JanssenMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanySvetlana G. JorstadAstronomical Institute, St. Petersburg University, Universitetskij pr., 28, Petrodvorets,198504 St.Petersburg, RussiaJae-Young KimDepartment of Astronomy and Atmospheric Sciences, Kyungpook National University, Daegu 702-701, Republic of KoreaJun Yi KoayInstitute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.CY. Y. KovalevLebedev Physical Institute of the Russian Academy of Sciences, Leninsky prospekt 53, 119991 Moscow, RussiaShoko KoyamaInstitute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.CA. P. LobanovMax-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, GermanyLaurent LoinardInstituto de Astronomía, Universidad Nacional Autónoma de México, CdMx 04510, MéxicoRu-Sen LuKey Laboratory of Radio Astronomy, Chinese Academy of Sciences, Nanjing 210008, People's Republic of ChinaSera MarkoffAnton Pannekoek Institute for Astronomy, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The NetherlandsAlan P. MarscherInstitute for Astrophysical Research, Boston University, 725 Commonwealth Ave., Boston, MA 02215, USAI. Martí‐VidalDepartament d’Astronomia i Astrofísica, Universitat de València, C. Dr. Moliner 50, E-46100 Burjassot, València, SpainYosuke MizunoInstitut für Theoretische Physik, Goethe-Universität Frankfurt, Max-von-Laue-Straße 1, D-60438 Frankfurt am Main, GermanyJongho ParkInstitute of Astronomy and Astrophysics, Academia Sinica, 11F of Astronomy-Mathematics Building, AS/NTU No. 1, Sec. 4, Roosevelt Road, Taipei 10617, Taiwan, R.O.CT. SavolainenAalto University Department of Electronics and Nanoengineering, PL 15500, FI-00076 Aalto, FinlandTeresa ToscanoInstituto de Astrofísica de Andalucía-CSIC, Glorieta de la Astronomía s/n, E-18008 Granada, Spain; [email protected]

2022en

ABI

Аннотация

Abstract We present the first very long baseline interferometric (VLBI) observations of the blazar OJ 287 carried out jointly with the Global Millimeter VLBI Array (GMVA) and the phased Atacama Large Millimeter/submillimeter Array (ALMA) at 3.5 mm on 2017 April 2. The participation of phased ALMA has not only improved the GMVA north–south resolution by a factor of ∼3, but has also enabled fringe detections with signal-to-noise ratios up to 300 at baselines longer than 2 G λ . The high sensitivity has motivated us to image the data with newly developed regularized maximum likelihood imaging methods, revealing the innermost jet structure with unprecedentedly high angular resolution. Our images reveal a compact and twisted jet extending along the northwest direction, with two bends within the inner 200 μ as, resembling a precessing jet in projection. The component at the southeastern end shows a compact morphology and high brightness temperature, and is identified as the VLBI core. An extended jet feature that lies at ∼200 μ as northwest of the core shows a conical shape, in both total and linearly polarized intensity, and a bimodal distribution of the linear polarization electric vector position angle. We discuss the nature of this feature by comparing our observations with models and simulations of oblique and recollimation shocks with various magnetic field configurations. Our high-fidelity images also enabled us to search for possible jet features from the secondary supermassive black hole (SMBH) and test the SMBH binary hypothesis proposed for this source.

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Идентификаторы

DOI: 10.3847/1538-4357/ac6b9c

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Цитирований: 2Использованных источников: 0

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