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Resolving the inner parsec of the blazar J1924-2914 with the Event Horizon Telescope

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arxiv 2208.01662 v1 pith:XDIZ5FSR submitted 2022-08-02 astro-ph.HE

Sara Issaoun , Maciek Wielgus , Svetlana Jorstad , Thomas P. Krichbaum , Lindy Blackburn , Michael Janssen , Chi-Kwan Chan , Dominic W. Pesce
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Jose L. Gomez Kazunori Akiyama Monika Moscibrodzka Ivan Marti-Vidal Andrew Chael Rocco Lico Jun Liu Venkatessh Ramakrishnan Mikhail Lisakov Antonio Fuentes Guang-Yao Zhao Kotaro Moriyama Avery E. Broderick Paul Tiede Nicholas R. MacDonald Yosuke Mizuno Efthalia Traianou Laurent Loinard Jordy Davelaar Mark Gurwell Ru-Sen Lu Event Horizon Telescope Collaboration
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abstract

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-parsec scales. We combine the multi-frequency 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.

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Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. VAPOLA -- A multi-year, multi-band polarization survey of AGN and Sgr A* at mm wavelengths with ALMA I. Survey Overview and Science-Ready Archival Products

    astro-ph.GA 2026-07 accept novelty 6.0 of 10

    An automated pipeline and web portal deliver science-ready, full-polarization ALMA data products from VLBI campaigns for AGN and Sgr A* across Bands 3, 6, and 7.

  2. VAPOLA -- A multi-year, multi-band polarization survey of AGN and Sgr A* at mm wavelengths with ALMA I. Survey Overview and Science-Ready Archival Products

    astro-ph.GA 2026-07 conditional novelty 6.0 of 10

    VAPOLA releases multi-epoch multi-band ALMA full-Stokes products and polarimetric fits for AGN and Sgr A* via an automated pipeline and web portal.

  3. Dynamics and geometry of the inner sub-parsec-scale jet in 3C 279 observed with the Event Horizon Telescope

    astro-ph.GA 2026-07 conditional novelty 5.0 of 10

    EHT 2021 images of 3C 279 reveal an intrinsic, sideways-elongated jet base whose components move at apparent speeds up to 10c, implying a sub-parsec bend toward the observer and viewing angles below one degree.

  4. Can a gamma-ray dim radio blazar produce a 200-PeV neutrino? The case of PMN J0606$-$0724 and KM3-230213A

    astro-ph.HE 2025-09 conditional novelty 5.0 of 10

    A gamma-ray dim radio blazar, PMN J0606-0724, can plausibly explain the 200 PeV KM3NeT neutrino through proton-photon interactions in its radio core, with the associated gamma rays absorbed internally.

  5. Polarization Signatures from GRMHD Simulations of Black Hole Accretion

    astro-ph.HE 2026-05 unverdicted novelty 2.0 of 10

    Polarization signatures from GRMHD simulations of black hole accretion can help probe disk, corona, and jet properties when combined with X-ray polarimetry observations.

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