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We present rest-frame optical spectra for a sample of 9 low-mass star-forminggalaxies in the redshift range 1.5 < z < 3 which are gravitationally lensed byforeground clusters. We used Triplespec, an echelle spectrograph at the Palomar200-inch telescope that is very effective for this purpose as it samples theentire near-infrared spectrum simultaneously. By measuring the flux of nebularemission lines we derive gas phase metallicities and star formation rates, andby fitting the optical to infrared spectral energy distributions we obtainstellar masses. Taking advantage of the high magnification due to stronglensing we are able to probe the physical properties of galaxies with stellarmasses in the range 7.8 < log M/Msun < 9.4 whose star formation rates aresimilar to those of typical star-forming galaxies in the local universe. Wecompare our results with the locally determined relation between stellar mass,gas metallicity and star formation rate. Our data are in excellent agreementwith this relation, with an average offset <Delta log O/H> = 0.01 +/- 0.08,suggesting a universal relationship. Remarkably, the scatter around thefundamental metallicity relation is only 0.24 dex, smaller than that observedlocally at the same stellar masses, which may provide an important additionalconstraint for galaxy evolution models.

Testing the Universality of the Fundamental Metallicity Relation at High Redshift Using Low-Mass Gravitationally Lensed Galaxies