{
  "abstract": "We report a long-lived nuclear transient in GNz7q, a red quasar at $z=7.19$ powered by a $\\sim3\\times10^{7}\\,M_\\odot$ black hole and hosted by a compact, dusty starburst galaxy. The transient was identified in more than two decades of imaging with HST, Spitzer, and JWST. After a rapid rise, the source faded smoothly by $Δm\\simeq1.1$ mag in the rest-frame ultraviolet over $\\sim2$ rest-frame yr, with coherent, wavelength-dependent evolution across 1--5 $μ$m that places GNz7q above the 99.9th percentile of the SDSS quasar variability distribution and is absent at $z\\gtrsim5$. The duration and energetics disfavor superluminous supernovae, and stochastic quasar variability reproduces the multi-band evolution with a probability of $\\lesssim10^{-5}$. A panchromatic model combining a thermal continuum with a $t^{-5/3}$ decline reproduces the light curves, yielding a peak bolometric luminosity of $\\simeq3\\times10^{45}$ erg s$^{-1}$ and a radiated energy of $\\simeq1.5\\times10^{53}$ erg, which imply the tidal disruption of a star of a few solar masses and place the event among the most energetic tidal disruption events (TDEs) known. A redshifted, extremely broad Balmer-line component in independent JWST/NIRSpec spectroscopy is consistent with a transient, non-virialized broad-line region. JWST/MIRI photometry further reveals delayed mid-infrared emission from $\\simeq1500$ K dust at a sub-parsec radius, consistent with a dust echo of the flare. The relatively low black-hole mass and dense star-forming nucleus of GNz7q are conditions under which TDEs are expected to be most efficient. These observations provide a time-domain view of episodic black-hole fueling and its dusty nuclear environment 700 million years after the Big Bang. Wide-field surveys with Roman and Euclid in the near-infrared, complemented by LSST at lower redshifts, may uncover such transients in large numbers.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.30441",
  "author_total": 44,
  "authors": [
    {
      "name": "S. Fujimoto"
    },
    {
      "name": "Q. Fei"
    },
    {
      "name": "G. B. Brammer"
    },
    {
      "name": "K. Inayoshi"
    },
    {
      "name": "V. Kokorev"
    },
    {
      "name": "L. C. Ho"
    },
    {
      "name": "R. Li"
    },
    {
      "name": "F. Walter"
    },
    {
      "name": "V. Bromm"
    },
    {
      "name": "L. Colina"
    },
    {
      "name": "P. Dayal"
    },
    {
      "name": "S. L. Finkelstein"
    },
    {
      "name": "M. Ginolfi"
    },
    {
      "name": "Z. Liu"
    },
    {
      "name": "G. C. K. Leung"
    },
    {
      "name": "G. E. Magdis"
    },
    {
      "name": "J. Matthee"
    },
    {
      "name": "R. P. Naidu"
    },
    {
      "name": "P. Oesch"
    },
    {
      "name": "M. Onoue"
    },
    {
      "name": "P. G. Pérez-González"
    },
    {
      "name": "D. Watson"
    },
    {
      "name": "J. Álvarez-Márquez"
    },
    {
      "name": "J. Antwi-Danso"
    },
    {
      "name": "Y. Asada"
    },
    {
      "name": "G. Barro"
    },
    {
      "name": "C. M. Casey"
    },
    {
      "name": "J. Chisholm"
    },
    {
      "name": "S. Gillman"
    },
    {
      "name": "R. Marques-Chaves"
    },
    {
      "name": "J. P. U. Fynbo"
    },
    {
      "name": "T. R. Greve"
    },
    {
      "name": "I. Labbe"
    },
    {
      "name": "R. A. Meyer"
    },
    {
      "name": "F. Rizzo"
    },
    {
      "name": "A. Robbins"
    },
    {
      "name": "R. Schneider"
    },
    {
      "name": "C. L. Steinhardt"
    },
    {
      "name": "S. Toft"
    },
    {
      "name": "A. Trinca"
    },
    {
      "name": "F. Valentino"
    },
    {
      "name": "R. Valiante"
    },
    {
      "name": "M. Vestergaard"
    },
    {
      "name": "M. Xiao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/f9s2envtspzm4.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.30441",
  "fulltext_url": null,
  "id": "f9s2envtspzm4",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.30441",
  "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",
      "3103|Astrophysical Phenomena and Observations"
    ]
  ],
  "openalex": "W7214594806",
  "pdf_url": "https://arxiv.org/pdf/2609.30441",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-24",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/f9s2envtspzm4.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:24:52Z",
      "native_id": "2609.30441",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.30441"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "A tidal disruption event in a quasar at redshift 7.19",
  "title_text": "A tidal disruption event in a quasar at redshift 7.19",
  "type": "preprint",
  "updated_at": "2026-10-30T12:24:52Z",
  "url": "https://research.draconitic.com/paper/f9s2envtspzm4",
  "venue": "arXiv",
  "versions": []
}