We use three semi-analytic models (SAMs) of galaxy formation and evolution run on the same 1h⁻¹Gpc MultiDark Planck2 cosmological simulation to investigate the properties of [O II] emission line galaxies at redshift z ∼ 1. We compare model predictions with different observational data sets, including DEEP2–Firefly galaxies with absolute magnitudes. We estimate the [O II] luminosity (L[O II]) of our model galaxies using the public code GET_EMLINES, which ideally assumes as input the instantaneous star formation rates (SFRs). This property is only available in one of the SAMs under consideration, while the others provide average SFRs, as most models do. We study the feasibility of inferring galaxies’ L[O II] from average SFRs in postprocessing. We find that the result is accurate for model galaxies with dust attenuated L[O II] ≲ 1042.2erg s⁻¹ ( 1040.4erg s⁻¹ remains overall unchanged on scales above 1 h⁻¹Mpc, independently of the L[O II] computation.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plat
