Source Plane Reconstruction of The Bright Lensed Galaxy RCSGA 032727-132609
Keren Sharon, Michael D. Gladders, Jane R. Rigby, Eva Wuyts, Benjamin, P. Koester, Matthew B. Bayliss, L. Felipe Barrientos

TL;DR
This paper uses high-resolution HST imaging to refine the lens model of a strongly lensed galaxy at z=1.7, enabling detailed source-plane reconstruction to study small-scale structures in the galaxy.
Contribution
It provides an improved lens model based on HST data, allowing for accurate source-plane reconstruction of a high-redshift galaxy.
Findings
Refined lens model of RCSGA 032727-132609
Reconstructed galaxy in source plane at 100-pc scale
Facilitates future spatially-resolved spectral analysis
Abstract
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.
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