{
  "abstract": "We present a statistical study on the origins of the UV continuum and narrow/broad emission lines in little red dots (LRDs), presumably involving active galactic nuclei (AGNs). Leveraging all archived JWST/NIRSpec data, we build a sample of 27 spectroscopically confirmed LRDs at 5 < z spec < 7.2 by requiring broad H α emission, blue UV colors, V-shaped continua, and compact morphologies. We define a control sample of seven blue, compact, broad-line AGNs without red optical continua (hereafter little blue dots, LBDs) and examine correlations between rest UV and the narrow/broad H α luminosities in these populations. In LRDs, both narrow and broad H α components are tightly correlated with the UV continuum, and the luminosity ratios are consistent with those in young starburst galaxies. In contrast, the UV-to-broad-H α ratios in LBDs closely match local unobscured AGNs and are statistically different from LRDs. The Ly α occurrence rates and strengths do not differ between LRDs and LBDs and are comparable to normal star-forming galaxies. These results are consistent with a scenario where the central black hole in LRDs is enshrouded by a dense opaque gas envelope—in this model, the UV continuum as well as narrow and even broad H α emissions are powered not by AGNs but predominantly by young massive stars surrounding the envelope, while the envelope radiates as a ∼5000 K blackbody. As the envelope dissipates, direct AGN emission can emerge, potentially transforming LRDs into LBDs and marking the end of a short-lived phase of rapid black hole growth.",
  "abstract_shown": true,
  "affiliations": [
    "Dunlap Institute for Astronomy and Astrophysics",
    "Peking University",
    "University of Toronto",
    "NRC Herzberg"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 5,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Yoshihisa Asada",
      "orcid": "0000-0003-3983-5438"
    },
    {
      "affs": [
        1
      ],
      "name": "Kohei Inayoshi",
      "orcid": "0000-0001-9840-4959"
    },
    {
      "affs": [
        2
      ],
      "name": "Qinyue Fei",
      "orcid": "0000-0001-7232-5355"
    },
    {
      "affs": [
        0,
        2
      ],
      "name": "Seiji Fujimoto",
      "orcid": "0000-0001-7201-5066"
    },
    {
      "affs": [
        3
      ],
      "name": "Chris J. Willott",
      "orcid": "0000-0002-4201-7367"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/aakaz6fxa1ywq.bib",
  "cited_by": 34,
  "doi": "10.3847/2041-8213/ae7d0a",
  "fulltext_url": null,
  "id": "aakaz6fxa1ywq",
  "issns": [
    "2041-8205",
    "2041-8213"
  ],
  "landing_url": "https://doi.org/10.3847/2041-8213/ae7d0a",
  "language": "en",
  "licence": "CC-BY",
  "licence_label": "CC BY",
  "licence_source": "journal",
  "licence_url": "https://creativecommons.org/licenses/by/4.0/",
  "metadata_licence": null,
  "native_subjects": [
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7165951424",
  "pdf_url": "https://iopscience.iop.org/article/10.3847/2041-8213/ae7d0a/pdf",
  "pmcid": null,
  "pmid": null,
  "published": "2026-06-25",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/aakaz6fxa1ywq.ris",
  "sources": [
    {
      "first_seen": "2026-11-08T13:20:37Z",
      "native_id": "W7165951424",
      "source": "openalex",
      "url": "https://doi.org/10.3847/2041-8213/ae7d0a"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Galaxies: Formation, Evolution, Phenomena",
      "subfield": "galaxies"
    }
  ],
  "title": "Origins of the UV Continuum and Balmer Emission Lines in Little Red Dots: Observational Validation of Dense Gas Envelope Models Enshrouding the Active Galactic Nucleus",
  "title_text": "Origins of the UV Continuum and Balmer Emission Lines in Little Red Dots: Observational Validation of Dense Gas Envelope Models Enshrouding the Active Galactic Nucleus",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T13:21:01Z",
  "url": "https://research.draconitic.com/paper/aakaz6fxa1ywq",
  "venue": "The Astrophysical Journal Letters",
  "versions": []
}