{
  "abstract": "We report the discovery of the Seyfert galaxy J234728.73+242745.7 as a recurrent intermediate-type CLAGN with extreme optical/UV variability. Optical spectra spanning nearly three decades reveal Type 1.0$\\rightarrow$1.5$\\rightarrow$1.2 transitions, accompanied by the disappearance and reappearance of broad He II $\\lambda4686$ and a broad-line Balmer decrement evolving from 4.5 to 7.2 and then 2.4. Monitoring reveals coordinated variability from X-rays to the MIR. SED decomposition yields a host-corrected g-band high-to-low-state flux ratio of $5.4\\pm0.4$, exceeding the Swift/XRT ratio of $2.7\\pm0.8$ across the changing-look transition. This discrepancy may arise from reduced dust extinction, as correcting for the low-state continuum reddening ($A_V^{\\rm cont}=0.66\\pm0.23$ mag) brings the optical/UV ratios close to the X-ray value, although the correction is model-dependent and intrinsically weaker X-ray variability may also contribute. However, X-ray spectra show no compelling evidence for intrinsic gas absorption or its variability ($N_{\\rm H}^{\\rm intr}\\lesssim5\\times10^{20}$ cm$^{-2}$). In contrast, EP/WXT monitoring during the recent high state reveals order-of-magnitude X-ray fluctuations on monthly-to-sub-year timescales, exceeding contemporaneous optical variations. Meanwhile, the radio flux density remains stable at $\\sim2$ mJy across all ASKAP observations since mid-2020. Together with optical/UV and MIR variability and the broad He II transition, these results favor intrinsic accretion-state changes as the primary driver, while allowing a secondary contribution from variable obscuration. The source displays a loop-like MIR color--magnitude evolution, likely driven by the delayed response of an extended torus. This recurrent CLAGN offers a laboratory for probing the dynamic response of the broad-line region and circumnuclear dust to accretion-state transitions.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2611.04236",
  "author_total": 17,
  "authors": [
    {
      "name": "Jiahua Wu"
    },
    {
      "name": "Liming Dou"
    },
    {
      "name": "Yanli Ai"
    },
    {
      "name": "Jianguo Wang"
    },
    {
      "name": "Tinggui Wang"
    },
    {
      "name": "Huaqing Cheng"
    },
    {
      "name": "Chichuan Jin"
    },
    {
      "name": "Luis C. Ho"
    },
    {
      "name": "Qiming Wu"
    },
    {
      "name": "Kovi Rose"
    },
    {
      "name": "Roberto Soria"
    },
    {
      "name": "Alexis Coleiro"
    },
    {
      "name": "Junhui Fan"
    },
    {
      "name": "Yuan Liu"
    },
    {
      "name": "Dongyue Li"
    },
    {
      "name": "Zhen Zhang"
    },
    {
      "name": "Yunfei Xu"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/3zc5kxamd4pnp.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2611.04236",
  "fulltext_url": null,
  "id": "3zc5kxamd4pnp",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2611.04236",
  "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.GA"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2611.04236",
  "pmcid": null,
  "pmid": null,
  "published": "2026-11-03",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/3zc5kxamd4pnp.ris",
  "sources": [
    {
      "first_seen": "2026-11-04T15:21:25Z",
      "native_id": "2611.04236",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2611.04236"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "Extreme Multiwavelength Variability in the Recurrent Intermediate-type Changing-look Seyfert Galaxy SDSS J234728.73+242745.7",
  "title_text": "Extreme Multiwavelength Variability in the Recurrent Intermediate-type Changing-look Seyfert Galaxy SDSS J234728.73+242745.7",
  "type": "preprint",
  "updated_at": "2026-11-06T18:21:01Z",
  "url": "https://research.draconitic.com/paper/3zc5kxamd4pnp",
  "venue": "arXiv",
  "versions": []
}