We exploit the gravitational potential of a massive, rich cluster at z = 0.9 to study the internal properties of a gravitationally lensed galaxy at z=4.88. Using high resolution HST imaging together with optical (VIMOS) and near-infrared (SINFONI) Integral Field Spectroscopy we have studied the rest-frame UV and optical properties of the lensed galaxy seen through the cluster RCS0224-002. Using a detailed gravitational lens model of the cluster we reconstruct the source-frame morphology on 200pc scales and find an ∼L ∗ Lyman-break galaxy with an intrinsic size of only 2.0×0.8kpc, a velocity gradient of < ∼60 kms −1 and an implied dynamical mass of 1.0×10 10 M⊙ within 2kpc. We infer an integrated star-formation rate of just 12±2M ⊙ yr −1 from the intrinsic [Oii]λ3727 emission line flux. The Lyα emission appears redshifted by +200±40 kms −1 with respect to the [Oii] emission. The Lyα is also significantly more extended than the nebular emission, extending over 11.9×2.4kpc. Over this area, the Lyα centroid varies by less than 10 kms −1. We model the asymmetric Lyα emission
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Swinbank et al. (2007) studied this question.
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