{"about":{"site":"https://codewithpapers.app","non_affiliation":"Code with Papers and Syntology are not affiliated with, endorsed by, or sponsored by Papers with Code, Meta, or the pwc-archive mirror.","licence":"CC BY-SA 4.0","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","attribution":"https://codewithpapers.app/attribution","modified":"archive material modified by Syntology; see the attribution page"},"url":"/paper/genesis-metallicity-universal-non-parametric","title":"Genesis-Metallicity: Universal Non-Parametric Gas-Phase Metallicity Estimation","arxiv_id":"2409.07455","date":"2024-09-11","proceeding":null,"authors":["Danial Langeroodi","Jens Hjorth"],"abstract":"We introduce genesis-metallicity, a gas-phase metallicity measurement python software employing the direct and strong-line methods depending on the available oxygen lines. The non-parametric strong-line estimator is calibrated based on a kernel density estimate in the 4-dimensional space of O2 = [O II]$\\lambda\\lambda 3727,29$/H$\\beta$; O3 = [O III]$\\lambda 5007$/H$\\beta$; H$\\beta$ equivalent width EW(H$\\beta$); and gas-phase metallicity $12 + \\log$(O/H). We use a calibration sample of 1510 galaxies at $0 < z < 10$ with direct-method metallicity measurements, compiled from the JWST/NIRSpec and ground-based observations. In particular, we report 122 new NIRSpec direct-method metallicity measurements at $z > 1$. We show that the O2, O3, and EW(H$\\beta$) measurements are sufficient for a gas-phase metallicity estimate that is more accurate than 0.09 dex. Our calibration is universal, meaning that its accuracy does not depend on the target redshift. Furthermore, the direct-method module employs a non-parametric ${\\rm T}_{\\rm e}$(O II) electron temperature estimator based on a kernel density estimate in the 5-dimensional space of O2, O3, EW(H$\\beta$), ${\\rm T}_{\\rm e}$(O III), and ${\\rm T}_{\\rm e}$(O II). This ${\\rm T}_{\\rm e}$(O II) estimator is calibrated based on 1004 spectra with detections of both [O III]$\\lambda 4363$ and [O II]$\\lambda\\lambda 7320,30$, notably reporting 20 new NIRSpec detections of the [O II]$\\lambda\\lambda 7320,30$ doublet. We make genesis-metallicity and its calibration data publicly available and commit to keeping both up-to-date in light of the incoming data.","url_abs":"https://arxiv.org/abs/2409.07455v2","url_pdf":"https://arxiv.org/pdf/2409.07455v2.pdf","source":{"archive":"pwc-archive (Hugging Face), CC BY-SA 4.0","snapshot":"2025-07-28","licence_url":"https://creativecommons.org/licenses/by-sa/4.0/legalcode","row_kind":"links_only","authors_date_abstract":"arXiv metadata, CC0 1.0 (https://info.arxiv.org/help/license), from the Kaggle arXiv metadata snapshot of 2026-09-12"},"code_links":[{"paper_slug":"genesis-metallicity-universal-non-parametric","repo_url":"https://github.com/langeroodi/genesis_metallicity","is_official":1,"mentioned_in_paper":1,"mentioned_in_github":1,"framework":"none","reach":null}],"tasks":[],"methods":[],"datasets_introduced":[],"methods_introduced":[],"results":[],"syntology":{"syntology_url":null,"atlas_url":null,"mcp":null,"developers":"https://syntology.ai/developers"},"arxiv_metadata":null,"syntology_extracted_results":null}