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A relation between the stellar mass M and the gas-phase metallicity Z ofgalaxies, the MZR, is observed up to higher redshifts. It is a matter ofdebate, however, if the SFR is a second parameter in the MZR. To explore thisissue at z > 1, we used VLT-SINFONI near-infrared (NIR) spectroscopy of eightzCOSMOS galaxies at 1.3 < z < 1.4 to measure the strengths of four emissionlines: Hbeta, [OIII]lambda5007, Halpha, and [NII]lambda6584, additional to[OII]lambda3727 measured from VIMOS. We derive reliable O/H metallicities basedon five lines, and also SFRs from extinction corrected Halpha measurements. Wefind that the MZR of these star-forming galaxies at z~1.4 is lower than thelocal SDSS MZR by a factor of three to five, a larger change than reported inthe literature using [NII]/Halpha-based metallicities from individual andstacked spectra. Correcting N2-based O/Hs using recent results by Newman et al.(2014), also the larger FMOS sample at z~1.4 of Zahid et al. (2014) shows asimilar evolution of the MZR like the zCOSMOS objects. These observations seemalso in agreement with a non-evolving FMR using the physically motivatedformulation of the FMR from Lilly et al. (2013).

Oxygen abundances of zCOSMOS galaxies at z~1.4 based on five lines and implications for the fundamental metallicity relation