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We have carried out an extensive spectroscopic survey with the Keck and VLTtelescopes, targeting lensed galaxies in the background of the massive clusterAbell 68. Spectroscopic measurements are obtained for 26 lensed images,including a distant galaxy at z=5.4 . Redshifts have been determined for 5 outof 7 multiply-image systems. Through a careful modeling of the massdistribution in the strongly-lensed regime, we derive a mass estimate of 5.3 x10^14 Msun within 500 kpc. Our mass model is then used to constrain theredshift distribution of the remaining multiply-imaged and singly-imagedsources. This enables us to examine the physical properties for a subsample of7 Lyman-alpha emitters at 1.7 < z < 5.5, whose unlensed luminosities of ~ 10^41ergs/s are fainter than similar objects found in blank fields. Of particularinterest is an extended Lyman-alpha emission region surrounding a highlymagnified source at z=2.6, detected in VIMOS Integral Field Spectroscopy data.The physical scale of the most distant lensed source at z=5.4 is very small(<300 pc), similar to the lensed z ~ 5.6 emitter reported by Ellis et al.(2001) in Abell 2218. New photometric data available for Abell 2218 allow for adirect comparison between these two unique objects. Our survey illustrates thepracticality of using lensing clusters to probe the faint end of the z ~ 2-5Lyman-alpha luminosity function in a manner that is complementary to blankfield narrow-band surveys.

A Statistical Study of Multiply Imaged Systems in the Lensing Cluster Abell 68