{
  "abstract": "The James Webb Space Telescope (JWST) has identified an abundant population of faint Active Galactic Nuclei (AGN) at $z \\gtrsim 4$ which display broad emission lines, compact morphologies, and blue ultraviolet--optical continua. These ``Little Blue Dots' (LBDs) have been suggested to belong to the same family of objects as the more controversial ``Little Red Dots' (LRDs), with differences between the two largely owing to viewing angle effects. In this scenario, super-Eddington accretion resulting in high Extreme UV (EUV) and weak X-ray emission is invoked to explain the properties of both populations. We study the consequences of this super-Eddington scenario for the timing of Helium reionization. We find that observations which support an end to helium reionization no earlier than $z \\approx 3$ disfavor scenarios in which the majority of observed $3 \\lesssim z \\lesssim 7$ LBDs are highly super-Eddington. For our fiducial super-Eddington accretion scenario, we find that the fraction of the LBD population in this state must be $\\lesssim 10\\%$, assuming LBDs make up $5\\%$ of the $M_{ m UV} < -18$ galaxy population and have average escape fractions of $15\\%$, comparable to recent observations. Our constraint assumes that LBDs dominate the Helium reionization budget, and would be tighter if bright quasars also contributed significantly. For a majority of LBDs to be super-Eddington, they would need to have small escape fractions ($\\lesssim 1.5\\%$) and/or be less abundant than observations suggest. Our conclusions are sensitive to the shape of the EUV spectra of super-Eddington black holes, motivating further study.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.28745",
  "author_total": 8,
  "authors": [
    {
      "name": "Christopher Cain"
    },
    {
      "name": "Brent Smith"
    },
    {
      "name": "Gibson B. Bowling"
    },
    {
      "name": "Yongda Zhu"
    },
    {
      "name": "Lily Whitler"
    },
    {
      "name": "Rafael Ortiz III"
    },
    {
      "name": "Anson D'Aloisio"
    },
    {
      "name": "Rogier Windhorst"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/9pxh7q31qq026.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.28745",
  "fulltext_url": null,
  "id": "9pxh7q31qq026",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.28745",
  "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.CO"
    ],
    [
      "arxiv",
      "astro-ph.GA"
    ],
    [
      "openalex",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7204950369",
  "pdf_url": "https://arxiv.org/pdf/2608.28745",
  "pmcid": null,
  "pmid": null,
  "published": "2026-08-28",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/9pxh7q31qq026.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:17:41Z",
      "native_id": "2608.28745",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.28745"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.CO",
      "subfield": "cosmology"
    },
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Super-Eddington Little Blue Dots May Reionize Helium Too Early",
  "title_text": "Super-Eddington Little Blue Dots May Reionize Helium Too Early",
  "type": "preprint",
  "updated_at": "2026-10-30T12:17:41Z",
  "url": "https://research.draconitic.com/paper/9pxh7q31qq026",
  "venue": "arXiv",
  "versions": []
}