{
  "abstract": "The microquasar V4641 Sagittarii (V4641 Sgr) has recently been established as one of the most powerful Galactic PeV cosmic-ray accelerators (PeVatrons) through the detection of degree-scale gamma-ray emission to 0.8 PeV. Using XMM-Newton, we performed an X-ray survey of its gamma-ray-emitting regions during the quiescent phase. We discovered extended X-ray emission to the north and south of V4641 Sgr, aligned with the radio-jet axis, revealing X-ray jet structures extending over several tens of parsecs for the first time. The northern and southern knot-like features, dubbed n1 and s1, are located approximately 20 pc from the central binary and spatially coincident with the gamma-ray emission. The X-ray emission from each knot, characterized by a photon index of $Γ_X = 1.9 \\pm 0.1_{\\rm stat} \\pm 0.5_{\\rm syst}$ and an energy flux of $\\sim$(2--4)$\\times10^{-13}$~erg~cm$^{-2}$~s$^{-1}$ in the 2--10 keV band, is likely non-thermal in origin, indicating synchrotron radiation from accelerated electrons. The morphological coincidence between the X-ray and gamma-ray emission favors a leptonic scenario for the gamma rays, although the X-ray emission is more compact than the gamma-ray-emitting region and the hadronic scenario cannot be excluded. Through X-ray to gamma-ray modeling, we obtain a weak magnetic field strength of 3--5~$μ$G. We propose that the newly detected X-ray knots represent particle-acceleration sites, such as jet termination or (re-)collimation regions powered by V4641 Sgr, or downstream structures analogous to the knots of the outer jets in SS~433/W50. This discovery suggests that extended X-ray emission along jets would be a key signature, yet previously overlooked, in PeVatron microquasars.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.02966",
  "author_total": 37,
  "authors": [
    {
      "name": "Naomi Tsuji"
    },
    {
      "name": "Caterina Tresoldi"
    },
    {
      "name": "Kaya Mori"
    },
    {
      "name": "Hiromasa Suzuki"
    },
    {
      "name": "Matthew Lundy"
    },
    {
      "name": "Dmitry Khangulyan"
    },
    {
      "name": "Samar Safi-Harb"
    },
    {
      "name": "Laura Olivera-Nieto"
    },
    {
      "name": "Felix Aharonian"
    },
    {
      "name": "Shotaro Abe"
    },
    {
      "name": "Zhen Cao"
    },
    {
      "name": "Sabrina Casanova"
    },
    {
      "name": "Maria Chernyakova"
    },
    {
      "name": "Yi-Heng Chi"
    },
    {
      "name": "Stephane Corbel"
    },
    {
      "name": "E. de la Fuente"
    },
    {
      "name": "Hua Feng"
    },
    {
      "name": "Tatsuki Fujiwara"
    },
    {
      "name": "Noa Grollimund"
    },
    {
      "name": "Dezhi Huang"
    },
    {
      "name": "Yoshiyuki Inoue"
    },
    {
      "name": "Ryohei Kanazashi"
    },
    {
      "name": "Shigeo S. Kimura"
    },
    {
      "name": "Marianne Lemoine-Goumard"
    },
    {
      "name": "Jonathan Mackey"
    },
    {
      "name": "Alessio Marino"
    },
    {
      "name": "Samaresh Mondal"
    },
    {
      "name": "Kai Morita"
    },
    {
      "name": "Maxime Parra"
    },
    {
      "name": "Gabriele Ponti"
    },
    {
      "name": "Brian Reville"
    },
    {
      "name": "Megumi Shidatsu"
    },
    {
      "name": "Shunya Takekawa"
    },
    {
      "name": "Michelle Tsirou"
    },
    {
      "name": "Xiaojie Wang"
    },
    {
      "name": "Heshou Zhang"
    },
    {
      "name": "Ping Zhou"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a1k5xafj1jbjs.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.02966",
  "fulltext_url": null,
  "id": "a1k5xafj1jbjs",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.02966",
  "language": null,
  "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.HE"
    ],
    [
      "openalex",
      "3106|Astrophysics and Cosmic Phenomena"
    ]
  ],
  "openalex": "W7220393369",
  "pdf_url": "https://arxiv.org/pdf/2610.02966",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-02",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a1k5xafj1jbjs.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:26:45Z",
      "native_id": "2610.02966",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.02966"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "XMM-Newton Resolves Parsec-scale X-ray Jets in the PeVatron Microquasar V4641 Sgr",
  "title_text": "XMM-Newton Resolves Parsec-scale X-ray Jets in the PeVatron Microquasar V4641 Sgr",
  "type": "preprint",
  "updated_at": "2026-10-30T12:26:45Z",
  "url": "https://research.draconitic.com/paper/a1k5xafj1jbjs",
  "venue": "arXiv",
  "versions": []
}