{
  "annotation_id": "04fc320e-0a74-457d-9482-3b4f7d104d79",
  "date_created": "2026-02-17T05:53:24.266000Z",
  "date_modified": "2026-02-17T05:53:24.266000Z",
  "file_hash": "ca6bd21ef222ee95493173ed3b9f653c4b5a28be1f0c2c8e341325a0b996fbc2",
  "private": false,
  "record": {
    "abstract": "We present a statistical study on the origins of the UV continuum and narrow/broad emission lines in little red dots (LRDs), a newly discovered class of active galactic nuclei (AGNs). Leveraging all archived JWST/NIRSpec data, we build a sample of 28 spectroscopically-confirmed LRDs at $5\u003cz_{\\rm spec}\u003c7.2$, by requiring broad H$\\alpha$ emission, blue UV colors, V-shaped continua, and compact morphologies. We define a control sample of 9 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$\\alpha$ luminosities in these populations. In LRDs, both narrow and broad H$\\alpha$ 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$\\alpha$ ratios in LBDs closely match local unobscured AGNs and are statistically different from LRDs. The Ly$\\alpha$ 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 BH in LRDs is enshrouded by a dense opaque gas envelope -- in this model, the UV continuum as well as narrow and even broad H$\\alpha$ emissions are not powered by AGNs but predominantly by young massive stars surrounding the envelope, while the envelope radiates as a $\\sim 5000$ 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.",
    "arxiv_id": "2601.10573",
    "authors": [
      "Yoshihisa Asada",
      "Kohei Inayoshi",
      "Qinyue Fei",
      "Seiji Fujimoto",
      "Chris Willott"
    ],
    "categories": [
      "astro-ph.GA"
    ],
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Origins of the UV continuum and Balmer emission lines in Little Red Dots: observational validation of dense gas envelope models enshrouding the AGN",
    "url": "https://arxiv.org/abs/2601.10573",
    "version": "v2"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9872e09c-c0bf-441e-98b0-8247f8cdb5cd",
    "id": "arXiv Dataset",
    "type": "Model",
    "variant": "snapshot-2026-01-17",
    "version": "0.1.0"
  },
  "user_id": 1000002
}