{
  "abstract": "Strong gravitational lensing provides a unique tool of studying intrinsically faint high-redshift active galactic nuclei (AGN). In particular, low-luminosity AGN (LLAGN) can probe black-hole growth in low-mass galaxies that current X-ray surveys cannot otherwise access. We investigate the nature and physical properties of a faint X-ray source triply imaged by the galaxy cluster SDSS J2243$-$0935, and determine whether the source hosts an AGN. We combine archival Hubble Space Telescope imaging and Chandra X-ray observations with the published strong-lensing models of SDSS J2243$-$0935. We constrain the source redshift geometrically, derive magnification maps, and infer the physical properties of the host galaxy. The geometric lensing analysis gives a source redshift of $z=2.14^{+0.12}_{-0.17}$, consistent with the photometric redshift estimate, and a total magnification of $μ=78\\pm7$. The source is triply lensed and detected only in the HST F160W band, with an intrinsic magnitude of $m_{\\rm AB}=28.2\\pm0.2$. The rest-frame optical emission implies a stellar mass of $8.6\\lesssim\\log(M_\\star/M_\\odot)\\lesssim9.4$. The unobscured star formation rate is constrained to $\\mathrm{SFR}_{\\rm UV}<0.009\\,M_\\odot\\,\\mathrm{yr}^{-1}$, although substantial dust obscuration remains possible. Chandra detects X-ray point-source counterparts to all three HST-detected lensed images. The combined X-ray spectrum contains $100\\pm11$ net counts and is consistent with a moderately absorbed power law, with $Γ\\simeq 1.48$ and $N_{\\rm H}=(5.5\\pm4.4)\\times10^{22}\\,\\mathrm{cm}^{-2}$. After correcting for gravitational magnification, we obtain an intrinsic rest-frame $2$--$10$ keV luminosity of $L_{\\rm X}=1.2\\pm0.3\\times10^{42}\\,\\mathrm{erg\\,s^{-1}}$. The X-ray emission is likely dominated by an AGN hosted by a low-mass galaxy at $z\\simeq2.14$, making this system a strongly lensed LLAGN at cosmic noon (abridged).",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2610.10244",
  "author_total": 6,
  "authors": [
    {
      "name": "Marko Mićić"
    },
    {
      "name": "Olivia Holmes"
    },
    {
      "name": "Xinyu Dai"
    },
    {
      "name": "Kevin Hainline"
    },
    {
      "name": "Haikun Xue"
    },
    {
      "name": "Zijun Gao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/7rkcg52rvzn2r.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2610.10244",
  "fulltext_url": null,
  "id": "7rkcg52rvzn2r",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2610.10244",
  "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",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7220914372",
  "pdf_url": "https://arxiv.org/pdf/2610.10244",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-07",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/7rkcg52rvzn2r.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:27:37Z",
      "native_id": "2610.10244",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2610.10244"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.HE",
      "subfield": "high-energy-astrophysics"
    }
  ],
  "title": "A Gravitationally Lensed Low-Luminosity AGN From The Cosmic Noon",
  "title_text": "A Gravitationally Lensed Low-Luminosity AGN From The Cosmic Noon",
  "type": "preprint",
  "updated_at": "2026-10-30T12:27:37Z",
  "url": "https://research.draconitic.com/paper/7rkcg52rvzn2r",
  "venue": "arXiv",
  "versions": []
}