The Evolution of Low-Ionization Electron Densities in Galaxies Across Cosmic Epochs

arXiv:2608.23846 · astro-ph.GA · Submitted 2026-08-24 · Read on arXiv

astro-ph.GA

Submitted: 2026-08-24

Updated: 2026-08-24

Code: https://github.com/gbrammer/msaexp

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

Terminology

• Metallicity — 8× in this paper · explained in 3 episodes
• Trace — 7× in this paper · explained in 2 episodes
• Calibration — 3× in this paper · explained in 7 episodes
• Population Synthesis — 3× in this paper · explained in 2 episodes
• Abundance — 2× in this paper · explained in 1 episode
• Bayesian Inference — 1× in this paper · explained in 5 episodes
• Bayesian Inference Criterion — 1× in this paper
• Consistency — 1× in this paper · explained in 3 episodes
• Degeneracy — 1× in this paper · explained in 3 episodes
• Dust Attenuation — 1× in this paper · explained in 2 episodes
• Monte Carlo Analysis — 1× in this paper · explained in 2 episodes
• NIRSpec Micro-Shutter Array — 1× in this paper
• Stellar Feedback — 1× in this paper · explained in 2 episodes

Sources

• CLASSY XII: Nitrogen Enrichment Shaped by Gas Density and Feedback
• MARTA: Temperature-temperature relationships and strong-line metallicity calibrations from multiple auroral-line detections at cosmic noon
• MEGATRON: Disentangling Physical Processes and Observational Bias in the Multi-Phase ISM of High-Redshift Galaxies
• The 2013 Release of Cloudy
• A negligible contribution of two luminous $z$ ~ 7.5 galaxies to the ionizing photon budget of reionization
• JWST & ALMA Joint Analysis with [OII]$\lambda\lambda$3726,3729, [OIII]$\lambda$4363, [OIII]88$\mu$m, and [OIII]52$\mu$m: Multi-Zone Evolution of Electron Densities at $\mathbf{z\sim0-14}$ and Its Impact on Metallicity Measurements
• First direct carbon abundance measured at $z>10$ in the lensed galaxy MACS0647$-$JD
• The Impact of Star Formation and Feedback Recipes on the Stellar Mass and Interstellar Medium of High-Redshift Galaxies
• 50 years of temperature inhomogeneities in gaseous nebulae
• Fine-structure Line Atlas for Multi-wavelength Extragalactic Study (FLAMES) I: Comprehensive Low and High Redshift Catalogs and Empirical Relations for Probing Gas Conditions
• Under Pressure: Decoding the Effect of High Densities on Derived Nebular Properties
• CECILIA: Ultra-Deep Rest-Optical Spectra of Faint Galaxies at Cosmic Noon
• The JWST/AURORA Survey: Multiple Balmer and Paschen Emission Lines for Individual Star-forming Galaxies at z=1.5-4.4. I. A Diversity of Nebular Attenuation Curves and Evidence for Non-Unity Dust Covering Fractions
• CECILIA: Gas-Phase Physical Conditions and Multi-Element Chemistry at Cosmic Noon
• Feedback and dynamical masses in high-$z$ galaxies: the advent of high-resolution NIRSpec spectroscopy
• The JWST EXCELS survey: Probing strong-line diagnostics and the chemical evolution of galaxies over cosmic time using Te-metallicities
• RIOJA. JWST and ALMA unveil the inhomogeneous and complex ISM structure in a star-forming galaxy at $z=6.81$

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