The Sunburst Arc with JWST: III. An Abundance of Direct Chemical Abundances
Brian Welch, T. Emil Rivera-Thorsen, Jane Rigby, Taylor Hutchison,, Grace M. Olivier, Danielle A. Berg, Keren Sharon, Hakon Dahle, M. Riley, Owens, Matthew B. Bayliss, Gourav Khullar, John Chisholm, Matthew Hayes,, Keunho J. Kim

TL;DR
This study provides a detailed chemical abundance analysis of an individual HII region at redshift 2.37, revealing its metallicity, element ratios, and ionization conditions, and compares these to local galaxies.
Contribution
It presents the most comprehensive chemical abundance measurements of a high-redshift HII region using direct temperature diagnostics, enabling comparisons with local galaxy properties.
Findings
Gas-phase metallicity of 12+log(O/H)=7.97±0.05.
Enhanced nitrogen abundance indicating Wolf-Rayet star enrichment.
Consistent abundances of sulfur, argon, neon, and iron with local low-metallicity HII regions.
Abstract
We measure the gas-phase abundances of the elements He, N, O, Ne, S, Ar, and Fe in an individual H\textsc{ii} region known to be leaking Lyman-continuum photons in the Sunburst Arc, a highly magnified galaxy at redshift . We detect the temperature-sensitive auroral lines [SII], [OII], [SIII], [OIII], and [NeIII] in a stacked spectrum of 5 multiple images of the Lyman-continuum emitter (LCE), from which we directly measure the electron temperature in the low, intermediate, and high ionization zones. We also detect the density-sensitive doublets of [OII], [SII], and [ArIV], which constrain the density in both the low- and high-ionization gas. With these temperature and density measurements, we measure gas-phase…
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Taxonomy
TopicsIonosphere and magnetosphere dynamics · Laser-induced spectroscopy and plasma · Solar and Space Plasma Dynamics
