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We present the spatially resolved emission line ratio properties of a ~10^10M_sun star-forming galaxy at redshift z=1.03. This galaxy is gravitationallylensed as a triple-image giant arc behind the massive lensing cluster Abell2667. The main image of the galaxy has magnification factors of 14+/-2.1 influx and ~ 2 by 7 in area, yielding an intrinsic spatial resolution of 115-405pc after AO correction with OSIRIS at KECK II. The HST morphology shows aclumpy structure and the H\alpha\ kinematics indicates a large velocitydispersion with V_{max} sin(i)/\sigma ~ 0.73, consistent with high redshiftdisk galaxies of similar masses. From the [NII]/H\alpha\ line ratios, we findthat the central 350 parsec of the galaxy is dominated by star formation. The[NII]/H\alpha\ line ratios are higher in the outer-disk than in the centralregions. Most noticeably, we find a blue-shifted region of strong[NII]/H\alpha\ emission in the outer disk. Applying our recent HII region andslow-shock models, we propose that this elevated [NII]/H\alpha\ ratio region iscontaminated by a significant fraction of shock excitation due to galacticoutflows. Our analysis suggests that shocked regions may mimic flat or invertedmetallicity gradients at high redshift.

The A2667 Giant Arc at z=1.03: Evidence for Large-scale Shocks at High Redshift