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We report on the discovery of 28 $z\approx0.8$ metal-poor galaxies in DEEP2.These galaxies were selected for their detection of the weak[OIII]$\lambda$4363 emission line, which provides a "direct" measure of thegas-phase metallicity. A primary goal for identifying these rare galaxies is toexamine whether the fundamental metallicity relation (FMR) between stellarmass, gas metallicity, and star formation rate (SFR) holds for low stellar massand high SFR galaxies. The FMR suggests that higher SFR galaxies have lowermetallicity (at fixed stellar mass). To test this trend, we combinespectroscopic measurements of metallicity and dust-corrected SFRs, with stellarmass estimates from modeling the optical photometry. We find that thesegalaxies are $1.05\pm0.61$ dex above the z~1 stellar mass-SFR relation, and$0.23\pm0.23$ dex below the local mass-metallicity relation. Relative to theFMR, the latter offset is reduced to 0.01 dex, but significant dispersionremains (0.29 dex with 0.16 dex due to measurement uncertainties). Thisdispersion suggests that gas accretion, star formation and chemical enrichmenthave not reached equilibrium in these galaxies. This is evident by their shortstellar mass doubling timescale of $\approx100^{+310}_{-75}$ Myr that suggestsstochastic star formation. Combining our sample with other z~1 metal-poorgalaxies, we find a weak positive SFR-metallicity dependence (at fixed stellarmass) that is significant at 94.4% confidence. We interpret this positivecorrelation as recent star formation that has enriched the gas, but has not hadtime to drive the metal-enriched gas out with feedback mechanisms.

astrophysical journal/the astrophysical journal

Metal-poor, Strongly Star-Forming Galaxies in the DEEP2 Survey: The  Relationship between Stellar Mass, Temperature-based Metallicity, and Star  Formation Rate