The internal metallicity distributions of simulated galaxies from EAGLE, Illustris, and IllustrisTNG at <i>z</i> = 1.8–4 as probed by gamma-ray burst hosts

ABSTRACT Massive stars are thought to be progenitors of long gamma-ray bursts (GRBs), most likely with a bias favouring low-metallicity progenitors. Because galaxies do not have constant metallicity throughout, the combination line-of-sight absorption inferred from GRB afterglow spectroscopy and host galaxy global derived emission lines diagnostics represents powerful way probe both function for chemical inhomogeneities across star-forming regions. In this study, we predict relationship between Zabs Zemiss using three different hydrodynamical cosmological simulations: Illustris, EAGLE, IllustrisTNG. We find that while qualitative shape curve relating versus remains same, predicted these two observables is significantly simulations. Using data GRB121024A which been measured, marginal support Illustris simulation as producing most-realistic internal distributions within at cosmic noon. Overall, all simulations similar properties bulk population, but each has distinct features in tail Zabs-Zemiss distribution principle allow discriminate models if sufficiently large sample observations available (i.e. N ≳ 11 on average). Substantial progress expected near future, upcoming JWST/NIRspec 10 spectra exists.