Description
Recent JWST observations have revealed extreme emission-line strengths, unexpected chemical enrichment patterns, and unusual spectral features in high-redshift galaxies, challenging our understanding of early stellar populations. Using the Maraston stellar population model with the latest Geneva tracks, we incorporate nebular emission via Cloudy and compare our results to other models, finding significant differences in high-ionization lines like He IIλ1640 and [O III]λ5007 due to variations in stellar rotation and Wolf-Rayet phase temperatures. Notably, our single-star models predict higher [O III] ionizing photon rates than binary-star models at ages of 1–8 Myr, underscoring the sensitivity of spectral energy distribution (SED) fitting to model assumptions.
