Theoretical strong-line metallicity diagnostics for the JWST era

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dc.contributor.authorGarg, Prerak
dc.contributor.authorDave, Romeel
dc.contributor.authorSanders, Ryan L
dc.date.accessioned2025-01-30T09:27:36Z
dc.date.available2025-01-30T09:27:36Z
dc.date.issued2024
dc.description.abstractThe ratios of strong rest-frame optical emission lines are the dominant indicators of metallicities in high-redshift galaxies. Since typical strong-line-based metallicity indicators are calibrated on auroral lines at z = 0, their applicability for galaxies in the distant Universe is unclear. In this paper, we make use of mock emission-line data from cosmological simulations to investigate the calibration of rest-frame optical emission lines as metallicity indicators at high redshift. Our model, which couples the SIMBA cosmological galaxy formation simulation with CLOUDY photoionization calculations, includes contributions from H II regions, post-asymptotic-giant-branch stars, and diffuse ionized gas (DIG). We find mild redshift evolution in the 12 indicators that we study, which implies that the dominant physical properties that evolve in our simulations do have a discernible impact on the metallicity calibrations at high redshifts. When comparing our calibrations with high-redshift auroral line observations from the James Webb Space Telescope, we find a slight offset between our model results and the observations and find that a higher ionization parameter at high redshifts can be one of the possible explanations. We explore the physics that drives the shapes of strong-line metallicity relationships and propose calibrations for hitherto unexplored low-metallicity regimes. Finally, we study the contribution of DIG to total line fluxes.
dc.identifier.citationGarg, P., Narayanan, D., Sanders, R.L., Davé, R., Popping, G., Shapley, A.E., Stark, D.P. and Trump, J.R., 2024. Theoretical Strong-line Metallicity Diagnostics for the JWST Era. The Astrophysical Journal, 972(1), p.113.
dc.identifier.urihttps://doi.org/10.3847/1538-4357/ad5ae1
dc.identifier.urihttps://hdl.handle.net/10566/19946
dc.language.isoen
dc.publisherInstitute of Physics
dc.subjectMetallicity
dc.subjectGalaxy evolution
dc.subjectHigh-redshift galaxies
dc.subjectHydrodynamical simulations
dc.subjectPhotoionization
dc.titleTheoretical strong-line metallicity diagnostics for the JWST era
dc.typeArticle

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