{
  "abstract": "> The determination of sulphur abundances in active galactic nuclei (AGN) is uncertain because ionisation correction factors (ICFs) are commonly calibrated for HII regions. We extend the HII-CHI-mistry methodology to derive total S/H in AGN from optical emission lines through comparison with photoionisation models. Tests against Seyfert galaxies with direct-method ionic abundances favour models with alpha_ox=-1.2 and a 98% free-electron stopping criterion. While O/H agrees with previous determinations, HCm yields systematically larger S/H than direct-method analyses using classical ICFs, suggesting that these prescriptions underestimate higher sulphur ionisation stages in AGN. Applied to MaNGA Seyfert and LINER-like regions, the method reveals a common positive S/O-metallicity relation. Seyferts show slightly larger median S/O than star-forming regions at high O/H, while LINERs occupy an intermediate position. These differences become weaker when S/H rather than O/H is used as the metallicity tracer, although Seyferts still tend to populate the upper envelope. Sulphur may therefore provide a robust tracer of gas-phase metallicity, while the differences between Seyferts and LINERs may reflect differences in their ionisation conditions and ionising SEDs.",
  "abstract_shown": true,
  "affiliations": [],
  "article_type": null,
  "arxiv": "2608.25919",
  "author_total": 5,
  "authors": [
    {
      "name": "E. Pérez-Montero"
    },
    {
      "name": "O. L. Dors Jr."
    },
    {
      "name": "I. A. Zinchenko"
    },
    {
      "name": "B. Pérez-D\\'ıaz"
    },
    {
      "name": "J. M. V\\'ılchez"
    }
  ],
  "bibtex": "https://research.draconitic.com/paper/cpr07saevs56v.bib",
  "cited_by": 0,
  "doi": "10.48550/arxiv.2608.25919",
  "fulltext_url": null,
  "id": "cpr07saevs56v",
  "issns": [],
  "landing_url": "https://arxiv.org/abs/2608.25919",
  "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/2608.25919",
  "pmcid": null,
  "pmid": null,
  "published": "2026-10-27",
  "publisher": null,
  "ris": "https://research.draconitic.com/paper/cpr07saevs56v.ris",
  "sources": [
    {
      "first_seen": "2026-10-30T12:36:22Z",
      "native_id": "2608.25919",
      "source": "arxiv",
      "url": "https://arxiv.org/abs/2608.25919"
    }
  ],
  "subjects": [
    {
      "field": "astronomy",
      "origin": "arxiv:astro-ph.GA",
      "subfield": "galaxies"
    }
  ],
  "title": "HII-CHI-mistry for active galactic nuclei: optical sulphur abundances without empirical ionisation correction factors",
  "title_text": "HII-CHI-mistry for active galactic nuclei: optical sulphur abundances without empirical ionisation correction factors",
  "type": "preprint",
  "updated_at": "2026-11-01T12:20:44Z",
  "url": "https://research.draconitic.com/paper/cpr07saevs56v",
  "venue": "arXiv",
  "versions": [
    {
      "doi": "10.33232/001c.173273",
      "pid": "9kc7trjdzr2gh",
      "relation": "published-as",
      "title": "HII-CHI-mistry for active galactic nuclei: optical sulphur abundances without empirical ionisation correction factors",
      "venue": "The Open Journal of Astrophysics"
    }
  ]
}