We present an analysis of the chemical abundance properties of ~650 star-forming galaxies at z~=0.6-1.8. Using integral-field observations from the K-band multi-object spectrograph (KMOS), we quantify the [NII]/H{alpha} emission-line ratio, a proxy for the gas-phase oxygen abundance within the interstellar medium. We define the stellar mass-metallicity relation at z~=0.6-1.0 and z~=1.2-1.8 and analyse the correlation between the scatter in the relation and fundamental galaxy properties (e.g. H{alpha} star formation rate, H{alpha} specific star formation rate, rotation dominance, stellar continuum half-light radius, and Hubble-type morphology). We find that for a given stellar mass, more highly star-forming, larger, and irregular galaxies have lower gas-phase metallicities, which may be attributable to their lower surface mass densities and the higher gas fractions of irregular systems. We measure the radial dependence of gas- phase metallicity in the galaxies, establishing a median, beam smearing corrected, metallicity gradient of {DELTA}Z/{DELTA}R=0.002+/-0.004dex/kpc, indicating on average there is no significant dependence on radius. The metallicity gradient of a galaxy is independent of its rest-frame optical morphology, whilst correlating with its stellar mass and specific star formation rate, in agreement with an inside-out model of galaxy evolution, as well as its rotation dominance. We quantify the evolution of metallicity gradients, comparing the distribution of {DELTA}Z/{DELTA}R in our sample with numerical simulations and observations at z~=0-3. Galaxies in our sample exhibit flatter metallicity gradients than local star- forming galaxies, in agreement with numerical models in which stellar feedback plays a crucial role redistributing metals.

Cone search capability for table J/MNRAS/500/4229/kross (KROSS data)

Cone search capability for table J/MNRAS/500/4229/kges (KGES data)