{
  "abstract": "One of JWST’s most unexpected discoveries is the emergence of “Little Red Dots” (LRDs), compact sources at z ≳ 3 with blue rest-frame UV continua, red optical slopes, and broad Balmer emission lines that challenge standard models and suggest early, unusual active galactic nuclei (AGNs). Using a comprehensive photometric selection and public NIRSpec/PRISM spectroscopy across six JWST deep fields, we identify a large sample of 118 LRDs with high-signal-to-noise-ratio spectra, enabling a population-wide analysis of their UV–optical continuum and lines. We find clear correlations between rest-frame UV–optical color ([0.3−0.9 μ m]) and slopes; bluer LRDs have blue UV slopes ( β ν ,UV ∼ 0.3) and red optical slopes, while redder LRDs exhibit redder UV slopes ( β ν ,UV ∼ 1.1). The continuum shape shows a similar trend; redder LRDs display prominent Balmer breaks and curvature, while bluer LRDs follow power-law-like optical spectral energy distributions. From literature compilations, ∼60% of known broad-line AGNs satisfy our LRD criteria, and up to 90% of LRDs show broad Balmer lines. Emission line diagnostics reveal a shift from high H α /H β and low [O iii ] λ 5007/H β in redder LRDs to the opposite in bluer ones, along with stronger narrow-line equivalent widths, suggesting a transition from AGN- to host-dominated emission. We fit the spectra with a two-component model combining a gas-enshrouded black hole (BH) and a galaxy host. Redder LRDs require higher-luminosity, unreddened BHs and modestly reddened hosts; bluer LRDs require lower-luminosity, reddened BHs and dust-free galaxies. This framework reproduces the diversity in colors and spectral shape by varying BH luminosity, obscuration, and BH-to-host luminosity ratio.",
  "abstract_shown": true,
  "affiliations": [
    "University of the Pacific",
    "Centro de Astrobiología (CAB)",
    "Department of Physics and Astronomy",
    "University of Connecticut",
    "NSF National Optical-Infrared Astronomy Research Laboratory",
    "Astrophysics Science Division",
    "Center for Space Sciences and Technology",
    "University of Edinburgh",
    "The University of Texas at Austin",
    "Université Paris-Saclay",
    "INAF—Osservatorio Astronomico di Roma",
    "University of Massachusetts Amherst",
    "Space Telescope Science Institute",
    "Institute of Physics",
    "Rochester Institute of Technology",
    "MIT Kavli Institute for Astrophysics and Space Research",
    "Texas A&M University",
    "Flatiron Institute",
    "Beijing Normal University",
    "Chinese Academy of Sciences",
    "University of Chinese Academy of Sciences (UCAS)"
  ],
  "article_type": null,
  "arxiv": null,
  "author_total": 29,
  "authors": [
    {
      "affs": [
        0
      ],
      "name": "Guillermo Barro",
      "orcid": "0000-0001-6813-875X"
    },
    {
      "affs": [
        1
      ],
      "name": "Pablo G. Pérez‐González",
      "orcid": "0000-0003-4528-5639"
    },
    {
      "affs": [
        2
      ],
      "name": "Dale D. Kocevski",
      "orcid": "0000-0002-8360-3880"
    },
    {
      "affs": [
        3
      ],
      "name": "Jonathan R. Trump",
      "orcid": "0000-0002-1410-0470"
    },
    {
      "affs": [
        4
      ],
      "name": "Mark Dickinson",
      "orcid": "0000-0001-5414-5131"
    },
    {
      "affs": [
        5,
        6
      ],
      "name": "Pablo Arrabal Haro",
      "orcid": "0000-0002-7959-8783"
    },
    {
      "affs": [
        3
      ],
      "name": "Madisyn Brooks",
      "orcid": "0000-0001-5384-3616"
    },
    {
      "affs": [
        4
      ],
      "name": "Callum T. Donnan",
      "orcid": "0000-0002-7622-0208"
    },
    {
      "affs": [
        7
      ],
      "name": "James S. Dunlop",
      "orcid": "0000-0002-1404-5950"
    },
    {
      "affs": [
        8
      ],
      "name": "Steven L. Finkelstein",
      "orcid": "0000-0001-8519-1130"
    },
    {
      "affs": [
        9
      ],
      "name": "Maximilien Franco",
      "orcid": "0000-0002-3560-8599"
    },
    {
      "affs": [
        10
      ],
      "name": "Giovanni Gandolfi",
      "orcid": "0000-0003-3248-5666"
    },
    {
      "affs": [
        11
      ],
      "name": "Mauro Giavalisco",
      "orcid": "0000-0002-7831-8751"
    },
    {
      "affs": [
        12
      ],
      "name": "Norman A. Grogin",
      "orcid": "0000-0001-9440-8872"
    },
    {
      "affs": [
        13
      ],
      "name": "Michaela Hirschmann",
      "orcid": "0000-0002-3301-3321"
    },
    {
      "affs": [
        14
      ],
      "name": "Jeyhan S. Kartaltepe",
      "orcid": "0000-0001-9187-3605"
    },
    {
      "affs": [
        12
      ],
      "name": "Anton M. Koekemoer",
      "orcid": "0000-0002-6610-2048"
    },
    {
      "affs": [
        12
      ],
      "name": "Rebecca L. Larson",
      "orcid": "0000-0003-2366-8858"
    },
    {
      "affs": [
        15
      ],
      "name": "Gene C. K. Leung",
      "orcid": "0000-0002-9393-6507"
    },
    {
      "affs": [
        12
      ],
      "name": "Ray A. Lucas",
      "orcid": "0000-0003-1581-7825"
    },
    {
      "affs": [
        2
      ],
      "name": "Elizabeth J. McGrath",
      "orcid": "0000-0001-8688-2443"
    },
    {
      "affs": [
        16
      ],
      "name": "Casey Papovich",
      "orcid": "0000-0001-7503-8482"
    },
    {
      "affs": [
        10
      ],
      "name": "Borja Pérez-Díaz",
      "orcid": "0000-0002-0939-9156"
    },
    {
      "affs": [
        17
      ],
      "name": "Rachel S. Somerville",
      "orcid": "0000-0002-6748-6821"
    },
    {
      "affs": [
        7
      ],
      "name": "Elizabeth Taylor",
      "orcid": "0000-0001-8728-2984"
    },
    {
      "affs": [
        8
      ],
      "name": "Anthony J. Taylor",
      "orcid": "0000-0003-1282-7454"
    },
    {
      "affs": [
        10
      ],
      "name": "Roberta Tripodi",
      "orcid": "0000-0002-9909-3491"
    },
    {
      "affs": [
        12
      ],
      "name": "L. Y. Aaron Yung",
      "orcid": "0000-0003-3466-035X"
    },
    {
      "affs": [
        18,
        19,
        20
      ],
      "name": "Xin Wang",
      "orcid": "0000-0002-9373-3865"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/4fm0t6q0xcjsg.bib",
  "cited_by": 40,
  "doi": "10.3847/1538-4357/ae5d2c",
  "fulltext_url": null,
  "id": "4fm0t6q0xcjsg",
  "issns": [
    "0004-637X",
    "1538-4357"
  ],
  "landing_url": "https://doi.org/10.3847/1538-4357/ae5d2c",
  "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"
    ]
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  "openalex": "W4417534126",
  "pdf_url": null,
  "pmcid": null,
  "pmid": null,
  "published": "2026-05-18",
  "publisher": "IOP Publishing",
  "ris": "https://research.draconitic.com/paper/4fm0t6q0xcjsg.ris",
  "sources": [
    {
      "first_seen": "2026-11-02T13:20:35Z",
      "native_id": "W4417534126",
      "source": "openalex",
      "url": "https://doi.org/10.3847/1538-4357/ae5d2c"
    }
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  "subjects": [
    {
      "field": "astronomy",
      "origin": "openalex:3103|Galaxies: Formation, Evolution, Phenomena",
      "subfield": "galaxies"
    }
  ],
  "title": "From “The Cliff” to “Virgil”: Mapping the Spectral Diversity of Little Red Dots with JWST/NIRSpec",
  "title_text": "From “The Cliff” to “Virgil”: Mapping the Spectral Diversity of Little Red Dots with JWST/NIRSpec",
  "type": "peer-reviewed",
  "updated_at": "2026-11-09T13:21:01Z",
  "url": "https://research.draconitic.com/paper/4fm0t6q0xcjsg",
  "venue": "The Astrophysical Journal",
  "versions": []
}