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In this letter, we exploit the gravitational potential of the rich clusterA2218 as a magnifying glass. We demonstrate that the magnification due to thecluster allows us to observe distant background galaxies at a comparable levelof detail to galaxies at z~0.1. Using the GMOS Integral Field Unit on GeminiNorth we observed the spatially-resolved [OII](3727) emission line spectrum fora lensed disk-galaxy at z=1.034. Using a detailed model for the cluster massdistribution, we are able to correct for the lensing by the cluster andreconstruct the source morphology. We find that the overall magnification is afactor of 4.92 +/- 0.15, and the rest-frame absolute I-band magnitude isM_{I}^{rest} = -22.4 +/- 0.2, where the error bars include conservativeestimates of the uncertainty in the source-plane reconstruction. Theinclination-corrected circular velocity is 206 +/- 18km/s. The galaxy lies veryclose to the mean Tully-Fisher relation of present-day spirals. Although ourresults are based on a single object, they demonstrate that gravitationallensing can be viably used to make detailed studies of the evolution of thestructure of distant field galaxies.

Galaxies under the Cosmic Microscope: A Gemini Multiobject Spectrograph Study of Lensed Disk Galaxy 289 in A2218