{
  "abstract": "The archetypal blazar 3C 279 hosts a prominent relativistic jet and exhibits strong broadband variability across the electromagnetic spectrum. In April 2017, the Event Horizon Telescope (EHT) observed 3C 279, alongside one of the most extensive quasi-simultaneous multiwavelength (MWL) campaigns ever conducted. With the aim of investigating the physical processes governing 3C 279, we analyzed individual observations and multiband light curves, and constructed a new quasi-simultaneous MWL spectrum. We also performed phenomenological modeling using the turbulent extreme multi-zone (TEMZ) model to constrain the fundamental physical properties of the source. The EHT observations reveal a clear flux increase in the innermost core between April 5 and 11, 2017. Over a broader timescale, radio measurements at longer wavelengths show concurrent enhancements in core flux and polarization around mid-April, coinciding with the ejection of a superluminal knot. Record UV-optical flares with strong polarization variability occurred in late March, followed by gamma-ray activity that declined before the end of the EHT observing period. During this interval, the source remained in a low X-ray state and showed no detectable VHE emission. The TEMZ modeling suggests that the broadband spectrum and variability of 3C 279 can be explained within a jet scenario in which turbulent plasma cells are compressed by a stationary conical shock. However, alternative interpretations, such as magnetic reconnection or a moving shock-in-jet event, remain plausible. This coordinated MWL campaign advances our understanding of the origin of jet and gamma-ray emission in 3C 279, while also providing a comprehensive publicly available dataset that will serve as a valuable reference for future studies.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": "Journal reference: A&A, 712, A224 (2026)",
  "arxiv": "2606.25868",
  "author_total": 533,
  "authors": [
    {
      "name": "G. Principe"
    },
    {
      "name": "J. C. Algaba"
    },
    {
      "name": "E. Aviano"
    },
    {
      "name": "W. Y. Cheong"
    },
    {
      "name": "K. Hada"
    },
    {
      "name": "D. Haggard"
    },
    {
      "name": "A. Hahn"
    },
    {
      "name": "S. G. Jorstad"
    },
    {
      "name": "E. V. Kravchenko"
    },
    {
      "name": "Y. Kovalev"
    },
    {
      "name": "S. S. Lee"
    },
    {
      "name": "M. Lisakov"
    },
    {
      "name": "S. Markoff"
    },
    {
      "name": "A. P. Marscher"
    },
    {
      "name": "M. Sasada"
    },
    {
      "name": "P. Voitsik"
    },
    {
      "name": "Kazunori Akiyama"
    },
    {
      "name": "Ezequiel Albentosa-Ruiz"
    },
    {
      "name": "Antxon Alberdi"
    },
    {
      "name": "Walter Alef"
    },
    {
      "name": "Richard Anantua"
    },
    {
      "name": "Eleni Antonopoulou"
    },
    {
      "name": "Keiichi Asada"
    },
    {
      "name": "Rebecca Azulay"
    },
    {
      "name": "Anne-Kathrin Baczko"
    },
    {
      "name": "David Ball"
    },
    {
      "name": "Bidisha Bandyopadhyay"
    },
    {
      "name": "John Barrett"
    },
    {
      "name": "Michi Baubock"
    },
    {
      "name": "Bradford A. Benson"
    },
    {
      "name": "Dan Bintley"
    },
    {
      "name": "Lindy Blackburn"
    },
    {
      "name": "Raymond Blundell"
    },
    {
      "name": "Katherine L. Bouman"
    },
    {
      "name": "Geoffrey C. Bower"
    },
    {
      "name": "Michael Bremer"
    },
    {
      "name": "Roger Brissenden"
    },
    {
      "name": "Silke Britzen"
    },
    {
      "name": "Avery E. Broderick"
    },
    {
      "name": "Dominique Broguiere"
    },
    {
      "name": "Thomas Bronzwaer"
    },
    {
      "name": "Sandra Bustamante"
    },
    {
      "name": "Douglas F. Carlos"
    },
    {
      "name": "John E. Carlstrom"
    },
    {
      "name": "Andrew Chael"
    },
    {
      "name": "Chi-kwan Chan"
    },
    {
      "name": "Dominic O. Chang"
    },
    {
      "name": "Koushik Chatterjee"
    },
    {
      "name": "Ming-Tang Chen"
    },
    {
      "name": "Yongjun Chen"
    },
    {
      "name": "Xiaopeng Cheng"
    },
    {
      "name": "Paul Chichura"
    },
    {
      "name": "Ilje Cho"
    },
    {
      "name": "Nicholas S. Conroy"
    },
    {
      "name": "John E. Conway"
    },
    {
      "name": "Thomas M. Crawford"
    },
    {
      "name": "Geoffrey B. Crew"
    },
    {
      "name": "Alejandro Cruz-Osorio"
    },
    {
      "name": "Yuzhu Cui"
    },
    {
      "name": "Brandon Curd"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3r4bnxx05hbky.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.25868",
  "fulltext_url": null,
  "id": "3r4bnxx05hbky",
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  "landing_url": "https://arxiv.org/abs/2606.25868",
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  "licence": "CC-BY-4.0",
  "licence_label": "CC BY 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
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      "astro-ph.HE"
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  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.25868",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-21",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3r4bnxx05hbky.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2606.25868",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.25868"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign",
  "title_text": "Broadband multiwavelength properties of the archetypal blazar 3C 279 during the 2017 Event Horizon Telescope campaign",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/3r4bnxx05hbky",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.1051/0004-6361/202659551",
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      "relation": "published-as",
      "title": null,
      "venue": null
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}