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We have obtained the mass–metallicity ( M – Z ) relation at different lookback times for the  same set of galaxies  from the Sloan Digital Sky Survey, using the stellar metallicities estimated with our spectral synthesis code  starlight . We have found that this relation steepens and spans a wider range in both mass and metallicity at higher redshifts. We have modelled the time evolution of stellar metallicity with a closed‐box chemical evolution model, for galaxies of different types and masses. Our results suggest that the  M – Z  relation for galaxies with present‐day stellar masses down to  10 10  M ⊙   is mainly driven by the history of star formation and not by inflows or outflows.

The evolution of the mass–metallicity relation in SDSS galaxies uncovered by astropaleontology