{
  "abstract": "We conduct the first systematic Search for High-Ionization Nebular Emission (SHINE) using [Ne V]$\\lambda3426$ in JWST/NIRSpec PRISM spectroscopy at $z>3$. From more than 9,000 galaxies, we identify 25 [Ne V] emitters spanning $z=3.059$-$9.444$ and $\\log_{10}(L_{\\rm [Ne\\,V]}/erg\\,s^{-1})=40.70$-$42.86$. Their [Ne V] luminosities overlap with those of local [Ne V]-selected active galactic nuclei (AGNs) and exceed those of local metal-poor [Ne V] emitters, although such low-luminosity systems would fall below our sensitivity. The population is diverse, spanning compact and extended morphologies and a broad range of continuum properties and stellar masses, including very low-mass hosts. It includes sources with broad Balmer emission as well as others whose higher-resolution spectra do not require a broad component. The [Ne V] emitters overlap only partly with conventional AGN diagnostics: most do not satisfy conservative high-redshift AGN criteria based on strong rest-optical narrow-line ratios, and only a minority have adopted broad-line classifications. [Ne V] upper limits for independently selected broad-line AGNs and little red dots are too shallow to establish a population-wide [Ne V] deficit. Six sources have secure Chandra counterparts, showing that X-ray weakness is not universal among luminous [Ne V] emitters. Strong [Ne V]/[Ne III] emission is associated with redder ultraviolet slopes and stronger Balmer breaks, but not with UV luminosity, possibly linking strong high-ionization emission to recent changes in star formation. The observed incidence of luminous [Ne V] emission shows no significant evolution over $z>3$, despite an increasing robust [Ne III] detection fraction. The high [Ne V] luminosities and hard line ratios favor black-hole accretion as the dominant power source, establishing [Ne V] emission as a complementary probe of early black-hole growth.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.27130",
  "author_total": 11,
  "authors": [
    {
      "name": "Shobita Satyapal"
    },
    {
      "name": "Sara Doan"
    },
    {
      "name": "Daniel Schaerer"
    },
    {
      "name": "Rui Marques-Chaves"
    },
    {
      "name": "Anurag Sawarkar"
    },
    {
      "name": "William Matzko"
    },
    {
      "name": "Camilo Vazquez"
    },
    {
      "name": "C. Daoutis"
    },
    {
      "name": "D. Korber"
    },
    {
      "name": "I. Morel"
    },
    {
      "name": "Mengyuan Xia"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/2881d2d4s6tqm.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.27130",
  "fulltext_url": null,
  "id": "2881d2d4s6tqm",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.27130",
  "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",
      "3103|Galaxies: Formation, Evolution, Phenomena"
    ]
  ],
  "openalex": "W7214218338",
  "pdf_url": "https://arxiv.org/pdf/2609.27130",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-22",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/2881d2d4s6tqm.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:23:56Z",
      "native_id": "2609.27130",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.27130"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Search for High-Ionization Nebular Emission (SHINE). I. A Systematically Selected [Ne V] Sample at z > 3 with JWST/NIRSpec PRISM",
  "title_text": "Search for High-Ionization Nebular Emission (SHINE). I. A Systematically Selected [Ne V] Sample at z > 3 with JWST/NIRSpec PRISM",
  "type": "preprint",
  "updated_at": "2026-10-30T12:23:56Z",
  "url": "https://research.draconitic.com/paper/2881d2d4s6tqm",
  "venue": "arXiv",
  "versions": []
}