{
  "abstract": "We present the largest sample to date of nitrogen-loud (N-loud) quasars with strong broad N IV] $\\lambda1486$ and/or N III] $\\lambda1750$ emission lines over the redshift range $1.6 < z < 4.3$, selected from the Dark Energy Spectroscopic Instrument (DESI) Data Release 1. The final sample contains 1,993 N-loud quasars, corresponding to about 1.2% of the parent quasar sample. The $L_{1450}$ distribution of the N-loud quasars is broadly similar to that of the DESI parent sample, but their redshift distribution is distinct, with a stronger concentration around $z \\sim 2.5$--3. Their composite spectrum displays a broadly similar UV continuum shape to that of the parent quasars, while showing significantly enhanced broad nitrogen emission features, including N V, N IV], and N III]. Other metal emission features also show a moderate enhancement. Relative to a control sample matched in redshift and UV continuum luminosity, the N-loud quasars show systematically narrower broad C IV and Mg II emission lines, lower single-epoch virial black hole masses, and higher Eddington ratios, suggesting that N-loud quasars may preferentially appear during a relatively rapid black hole accretion phase. The radio-loud fraction is 10.1%, with the highest fraction among objects exhibiting both N III] and N IV] emission. The catalog provides a statistical baseline for future studies of nitrogen enhancement and its physical origin.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2609.11104",
  "author_total": 7,
  "authors": [
    {
      "name": "Shuo Zhai"
    },
    {
      "name": "Wei-Jian Guo"
    },
    {
      "name": "Yong-Jie Chen"
    },
    {
      "name": "Zhi-Qiang Chen"
    },
    {
      "name": "Haining Li"
    },
    {
      "name": "Jian-Min Wang"
    },
    {
      "name": "Gang Zhao"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/17aewra5kk0f1.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2609.11104",
  "fulltext_url": null,
  "id": "17aewra5kk0f1",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2609.11104",
  "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": null,
  "pdf_url": "https://arxiv.org/pdf/2609.11104",
  "pmcid": null,
  "pmid": null,
  "published": "2026-09-10",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/17aewra5kk0f1.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:20:26Z",
      "native_id": "2609.11104",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2609.11104"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "Nitrogen-Loud Quasars from the Dark Energy Spectroscopic Instrument. I. Sample Selection and Basic Properties",
  "title_text": "Nitrogen-Loud Quasars from the Dark Energy Spectroscopic Instrument. I. Sample Selection and Basic Properties",
  "type": "preprint",
  "updated_at": "2026-10-30T12:20:26Z",
  "url": "https://research.draconitic.com/paper/17aewra5kk0f1",
  "venue": "arXiv",
  "versions": []
}