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

  title={A Statistical Study of Multiply Imaged Systems in the Lensing Cluster Abell 68},
  author={Johan Richard and Jean-Paul Kneib and Eric Jullo and G. Covone and Marceau Limousin and Richard S. Ellis and Daniel P. Stark and Kevin Bundy and Oliver Czoske and Harald Ebeling and Genevi{\`e}ve Soucail},
  journal={The Astrophysical Journal},
  pages={781 - 796}
We have carried out an extensive spectroscopic survey with the Keck and VLT telescopes, targeting lensed galaxies in the background of the massive cluster Abell 68. Spectroscopic measurements are obtained for 26 lensed images, including a distant galaxy at z = 5.4. Redshifts have been determined for 5 out of 7 multiple-image systems. Through a careful modeling of the mass distribution in the strongly lensed regime, we derive a mass estimate of 5.3 × 1014 M☉ within 500 kpc. Our mass model is… 

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