Toward Unbiased Abundance Measurements in Inhomogeneous H,II Regions

arXiv:2607.05295 · astro-ph.GA · Submitted 2026-07-06 · Read on arXiv

Eric Habjan, Christopher Faesi, Kathryn Kreckel, J. Eduardo Méndez-Delgado, Francesco Belfiore, Ryan J. Vaught, Brent Groves, Fabian Scheuermann, Thomas G. Williams, Ralf S. Klessen, Amirnezam Amiri, Kathryn Grasha, Simon Glover

astro-ph.GA

Submitted: 2026-07-06

Comments: 17 pages, 9 figures. To be submitted to the Open Journal of Astrophysics

License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/

Terminology

• Abundance — 122× in this paper · explained in 1 episode
• Metallicity — 43× in this paper · explained in 3 episodes
• Calibration — 24× in this paper · explained in 7 episodes
• Velocity Dispersion — 6× in this paper · explained in 2 episodes
• Trace — 2× in this paper · explained in 2 episodes
• Canada-France-Hawaii Telescope — 1× in this paper
• MUSE Data Analysis Pipeline — 1× in this paper
• Monte Carlo — 1× in this paper
• Multi-Unit Spectroscopic Explorer — 1× in this paper

Sources

• [O III]/[N II] as an Abundance Indicator at High Redshift
• Using Strong Lines to Estimate Abundances in Extragalactic HII Regions and Starburst Galaxies
• Metallicities of 0.3<z<1.0 Galaxies in the GOODS-North Field
• Temperature Structure and Metallicity in H II Regions
• Resolving the electron temperature discrepancies in HII Regions and Planetary Nebulae: kappa-distributed electrons
• Nebular spectroscopy: A guide on H II regions and planetary nebulae
• Temperature inhomogeneities cause the abundance discrepancy in H II regions
• On the abundance discrepancy problem in HII regions
• Densities, temperatures, pressures, and abundances derived from OII recombination lines in HII regions and their implications
• CHAOS I: Direct Chemical Abundances for HII Regions in NGC 628
• CHAOS IV: Gas-Phase Abundance Trends From The First Four CHAOS Galaxies
• Density biases and temperature relations for DESIRED HII regions
• What is the temperature structure in the giant HII region NGC 588?
• Investigating the Drivers of Electron Temperature Variations in HII Regions with Keck-KCWI and VLT-MUSE
• Chemical abundances in high-redshift galaxies: A powerful new emission line diagnostic
• The DESIRED strong-line calibrations: I. New empirical metallicity relations for the local and high-redshift universe
• The O3N2 and N2 abundance indicators revisited: improved calibrations based on CALIFA and Te-based literature data
• The Origin of the Mass--Metallicity Relation: Insights from 53,000 Star-Forming Galaxies in the SDSS
• Metallicity Calibrations and the Mass-Metallicity Relation for Star-Forming Galaxies
• A re-assessment of strong line metallicity conversions in the machine learning era

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