{
  "abstract": "Context: Dual active galactic nuclei (DAGN) - systems of two accreting supermassive black holes at kpc-scale separations - trace galaxy mergers and are the progenitors of gravitational-wave sources targeted by pulsar timing arrays and the upcoming Laser Interferometer Space Antenna. However, their radio properties remain poorly constrained, particularly at high redshift. Aims: We demonstrate the detectability of high-redshift DAGN at 144 MHz through sub-arcsec imaging of the LOFAR Two-metre Sky Survey (LoTSS) and characterize their low-frequency radio properties. Methods: We cross-matched 92 spectroscopically confirmed DAGN (z > 0.3, projected separation r_p < 30 kpc) with the LoTSS DR2 catalog and reprocessed international LOFAR telescope (ILT) data for three systems (0.59 < z < 2.39), achieving ~0.3 arcsec resolution at 144 MHz. Multi-frequency analysis and brightness-temperature diagnostics were used to investigate the radio emission. Results: We obtained high-quality ILT images for all three systems. In one source at z = 1.49, both AGN are detected at >5 sigma, making it one of the highest-redshift and faintest radio-detected DAGN. Brightness temperatures confirm AGN-powered emission even in sub-mJy sources. In the other two systems only one AGN is detected; for one, the new data constrain the low-frequency spectrum of a compact steep-spectrum source, indicating that its morphology is driven by jet-ISM interaction rather than the companion galaxy. For the 92 objects sample, the LoTSS detection rate is ~24%, significantly higher than for matched single AGN (~9-10%), suggesting an enhanced detectability of DAGN in the LoTSS. Conclusions: Low-frequency sub-arcsec radio observations provide an efficient, dust-unbiased method to detect and characterize DAGN. This pilot study establishes a benchmark for the forthcoming all-sky ~0.3 arcsec iLoTSS survey and future SKA observations.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.22449",
  "author_total": 28,
  "authors": [
    {
      "name": "Q. D'Amato"
    },
    {
      "name": "F. Mannucci"
    },
    {
      "name": "E. De Rubeis"
    },
    {
      "name": "I. Prandoni"
    },
    {
      "name": "A. De Rosa"
    },
    {
      "name": "M. Scialpi"
    },
    {
      "name": "M. Kunert-Bajraszewska"
    },
    {
      "name": "A. Janiuk"
    },
    {
      "name": "A. Krauze"
    },
    {
      "name": "L. Battistini"
    },
    {
      "name": "E. Bertola"
    },
    {
      "name": "C. Bracci"
    },
    {
      "name": "A. Chakraborty"
    },
    {
      "name": "M. Ceci"
    },
    {
      "name": "C. Cicone"
    },
    {
      "name": "G. Cresci"
    },
    {
      "name": "A. Marconi"
    },
    {
      "name": "C. Marconcini"
    },
    {
      "name": "E. Nardini"
    },
    {
      "name": "M. Parvatikar"
    },
    {
      "name": "A. Peca"
    },
    {
      "name": "K. Rubinur"
    },
    {
      "name": "P. Severgnini"
    },
    {
      "name": "C. Spingola"
    },
    {
      "name": "L. Ulivi"
    },
    {
      "name": "G. Venturi"
    },
    {
      "name": "C. Vignali"
    },
    {
      "name": "M. V. Zanchettin"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/6n9vytw3kkta7.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.22449",
  "fulltext_url": null,
  "id": "6n9vytw3kkta7",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.22449",
  "language": null,
  "licence": "CC-BY-NC-SA-4.0",
  "licence_label": "CC BY-NC-SA 4.0",
  "licence_source": "article",
  "licence_url": "http://creativecommons.org/licenses/by-nc-sa/4.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.22449",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-18",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/6n9vytw3kkta7.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:19Z",
      "native_id": "2609.22449",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.22449"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "LoTSS of dual AGN: enhanced detectability and prospects for a systematic search",
  "title_text": "LoTSS of dual AGN: enhanced detectability and prospects for a systematic search",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:19Z",
  "url": "https://research.draconitic.com/paper/6n9vytw3kkta7",
  "venue": "arXiv",
  "versions": []
}