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We obtained Subaru FMOS observations of Halpha emitting galaxies selectedfrom the HiZELS narrow-band survey, to investigate the relationship betweenstellar mass, metallicity and star-formation rate at z = 0.84 - 1.47, forcomparison with the Fundamental Metallicity Relation seen at low redshift. Ourfindings demonstrate, for the first time with a homogeneously selected sample,that a relationship exists for typical star-forming galaxies at z = 1 - 1.5 andthat it is surprisingly similar to that seen locally. Therefore, star-forminggalaxies at z = 1 - 1.5 are no less metal abundant than galaxies of similarmass and star formation rate (SFR) at z = 0.1, contrary to claims from someearlier studies. We conclude that the bulk of the metal enrichment for thisstar-forming galaxy population takes place in the 4 Gyr before z = 1.5. We fita new mass-metallicity-SFR plane to our data which is consistent with otherhigh redshift studies. However, there is some evidence that themass-metallicity component of this high redshift plane is flattened, at allSFR, compared with z = 0.1, suggesting that processes such as star-formationdriven winds, thought to remove enriched gas from low mass halos, are yet tohave as large an impact at this early epoch. The negative slope of theSFR-metallicity relation from this new plane is consistent with the picturethat the elevation in the SFR of typical galaxies at z > 1 is fuelled by theinflow of metal-poor gas and not major merging.

A fundamental metallicity relation for galaxies at z = 0.84 - 1.47 from HiZELS