Source Plane Reconstruction of The Bright Lensed Galaxy RCSGA   032727-132609
  We present new HST/WFC3 imaging data of RCSGA 032727-132609, a bright lensed galaxy at z=1.7 that is magnified and stretched by the lensing cluster RCS2 032727-132623. Using this new high-resolution imaging, we modify our previous lens model (which was based on ground-based data) to fully understand the lensing geometry, and use it to reconstruct the lensed galaxy in the source plane. This giant arc represents a unique opportunity to peer into 100-pc scale structures in a high-redshift galaxy. This new source reconstruction will be crucial for a future analysis of the spatially-resolved rest-UV and rest-optical spectra of the brightest parts of the arc. 
Keren Sharon, Michael D. Gladders, Jane R. Rigby, Eva Wuyts, Benjamin   P. Koester, Matthew B. Bayliss and L. Felipe Barrientos
astro-ph.CO