{
  "abstract": "Little Red Dots (LRDs) appear extremely compact at rest-frame optical wavelengths, yet many show extended rest-frame UV morphology revealing more complex internal structure. We present a combined analysis of VLT/MUSE rest-frame UV integral-field spectroscopy and continuum-subtracted [O III], H$β$, and H$α$+[N II] emission-line maps from JWST/NIRCam imaging at sub-kpc resolution for LRD-204851 at $z=5.482$ in GOODS-S. We find that LRD-204851 hosts a remarkably thin, bipolar, elongated structure passing through the optical continuum centroid and extending several kpc on either side, traced by both the UV continuum and the rest-frame optical emission lines, with a bright [O III] clump-like structure $\\sim$2 kpc to the south-east of the centroid. The MUSE observations reveal a double-peaked Ly$α$ profile, with a broad and bright near-systemic red peak and a relatively faint peak blueshifted by $\\sim$430 km s$^{-1}$, accompanied by a tentative N V $λ1238$ detection at similar velocity. In narrow-band imaging extracted from the MUSE IFU cube, both the blue Ly$α$ peak and the tentative N V emission lean toward this same south-eastern direction. Independently, radiative-transfer modeling of the integrated Ly$α$ profile favors a biconical low-column-density cavity in a dense, slowly expanding neutral envelope, in support of the bipolar geometry traced by the line maps. Together, these results suggest that the elongated emission of LRD-204851 is connected to radiation and/or gas flow from its central engine through a low-column-density channel with a small opening angle that may trace either a slow outflow or a quasi-static ionization cone. LRD-204851 is one of the first LRDs where the central engine's impact on its host galaxy is potentially directly observable on kpc scales.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2606.18342",
  "author_total": 10,
  "authors": [
    {
      "name": "Zhiyuan Ji"
    },
    {
      "name": "Yang Sun"
    },
    {
      "name": "Mauro Giavalisco"
    },
    {
      "name": "Yongda Zhu"
    },
    {
      "name": "George H. Rieke"
    },
    {
      "name": "Christina C. Williams"
    },
    {
      "name": "Michael V. Maseda"
    },
    {
      "name": "Jianwei Lyu"
    },
    {
      "name": "Marcia Rieke"
    },
    {
      "name": "Sandro Tacchella"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/a7a47p2cp0ymd.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2606.18342",
  "fulltext_url": null,
  "id": "a7a47p2cp0ymd",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2606.18342",
  "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"
    ]
  ],
  "openalex": null,
  "pdf_url": "https://arxiv.org/pdf/2606.18342",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/a7a47p2cp0ymd.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:18:00Z",
      "native_id": "2606.18342",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2606.18342"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Compact Core, Extended Reach: A Bipolar kpc-Scale Elongation in a Little Red Dot at $z \\approx 5.5$",
  "title_text": "Compact Core, Extended Reach: A Bipolar kpc-Scale Elongation in a Little Red Dot at z ≈ 5.5",
  "type": "preprint",
  "updated_at": "2026-10-30T12:18:00Z",
  "url": "https://research.draconitic.com/paper/a7a47p2cp0ymd",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.3847/2041-8213/ae9fea",
      "pid": null,
      "relation": "published-as",
      "title": null,
      "venue": null
    }
  ]
}