Evolution of the stellar metallicities of galaxies in the EAGLE
  simulations
  We study the correlation between stellar mass and stellar metallicity in the
Evolution and Assembly of GaLaxies and their Environments (EAGLE) suite of
cosmological hydrodynamical simulations. At a given stellar mass, simulated
galaxies with lower stellar metallicities show, on average, higher gas
fractions, higher specific star formation rates and younger stellar
populations. Active galactic nuclei feedback seems to play an important role on
the determination of the stellar metallicity at high stellar masses. In
general, simulated systems follow a well-defined anticorrelation between
stellar metallicity and gas fraction, which does not evolve significantly with
redshift. All these trends are consistent with previous findings regarding the
metallicity of the star-forming gas in EAGLE.
