{
  "abstract": "Outflows of ionised material, often dubbed warm absorbers (WAs), are common in nearby Seyferts but sparse in distant and more energetic quasars (QSOs). We present multi-epoch X-ray and optical observations of the serendipitously identified type-I QSO 2MASS J14302580+4159572 at a redshift of $z=0.35$, revealing the rare rise and decline of a transient ionised absorber over a 22-year timescale. The discovery observations were obtained with XMM-Newton between 2002 and 2005. The first two observations show unremarkable X-ray spectra typical of unobscured type-I QSOs, whereas the 2005 observation reveals a pronounced suppression of the spectrum below $\\sim3\\,\\mathrm{keV}$. Spectral analysis shows that this event is produced by a moderately ionised absorber with column density $N_{\\rm H}\\simeq5\\times10^{22}\\,\\mathrm{cm^{-2}}$ and ionisation parameter $\\logξ\\simeq1.4$. Joint analysis of XMM-Newton, NuSTAR, and Swift/XRT observations spanning 22 years indicates that the absorber remained stable for nearly 18 years before weakening in the 2023--2024 Swift/XRT data. Throughout this period, the intrinsic 3--10 keV continuum remained remarkably stable, indicating that the observed variability is driven by changes in line-of-sight ionised absorption rather than intrinsic luminosity fluctuations. We interpret the event as a thermally driven ionised outflow located outside the broad-line region (BLR), at sub-parsec to parsec scales, with a density of order $10^{6}\\,\\mathrm{cm^{-3}}$. Supporting this scenario, the high-ionisation [O\\,III] $\\lambda4363$ emission line varies in tandem with the X-ray absorption, suggesting that the outflow progressively modifies the ionisation state of the inner narrow-line region (NLR) on decadal timescales. These observations provide a rare view of the long-term evolution of a quasar warm absorber and its impact on the circumnuclear environment.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.19910",
  "author_total": 8,
  "authors": [
    {
      "name": "A. Akylas"
    },
    {
      "name": "A. Georgakakis"
    },
    {
      "name": "E. Pouliasis"
    },
    {
      "name": "I. Georgantopoulos"
    },
    {
      "name": "C. Ricci"
    },
    {
      "name": "M. Chira"
    },
    {
      "name": "A. Ruiz"
    },
    {
      "name": "E. M. Xilouris"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/59dg7wtg770qd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.19910",
  "fulltext_url": null,
  "id": "59dg7wtg770qd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.19910",
  "language": null,
  "licence": "LicenseRef-arXiv-nonexclusive-1.0",
  "licence_label": "arXiv licence",
  "licence_source": "article",
  "licence_url": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
  "metadata_licence": "CC0-1.0",
  "native_subjects": [
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "arxiv",
      "astro-ph.HE"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2609.19910",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-17",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/59dg7wtg770qd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:22:19Z",
      "native_id": "2609.19910",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.19910"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "The rise and decline of a transient obscuration event in a moderately distant type-I quasar",
  "title_text": "The rise and decline of a transient obscuration event in a moderately distant type-I quasar",
  "type": "preprint",
  "updated_at": "2026-10-30T12:22:19Z",
  "url": "https://research.draconitic.com/paper/59dg7wtg770qd",
  "venue": "arXiv",
  "versions": []
}