RELICS: A Strong Lens Model for SPTCLJ06155746, a z = 0.972 Cluster
Abstract
We present a lens model for the cluster SPTCLJ06155746, which is the highestredshift (z = 0.972) system in the Reionization of Lensing Clusters Survey, making it the highestredshift cluster for which a full, strong lens model is published. We identify three systems of multiply imaged lensed galaxies, two of which we spectroscopically confirm at z = 1.358 and z = 4.013, which we use as constraints for the model. We find a foreground structure at z ∼ 0.4, which we include as a second clustersized halo in one of our models; however, two different statistical tests find the bestfit model consists of one clustersized halo combined with three individually optimized galaxysized halos, as well as contributions from the cluster galaxies themselves. We find the total projected mass density within r = 26.″7 (the region where the strong lensing constraints exist) to be M={2.51}_{0.09}^{+0.15}× {10}^{14} M _{⊙}. If we extrapolate out to r _{500}, our projected mass density is consistent with the mass inferred from weak lensing and from the SunyaevZel’dovich effect (M ∼ 10^{15} M _{⊙}). This cluster is lensing a previously reported z ∼ 10 galaxy, which, if spectroscopically confirmed, will be the highestredshift strongly lensed galaxy known.
 Publication:

The Astrophysical Journal
 Pub Date:
 August 2018
 DOI:
 10.3847/15384357/aad239
 arXiv:
 arXiv:1805.09834
 Bibcode:
 2018ApJ...863..154P
 Keywords:

 clusters: individual: SPTCLJ0615–5746;
 gravitational lensing: strong;
 Astrophysics  Astrophysics of Galaxies;
 Astrophysics  Cosmology and Nongalactic Astrophysics
 EPrint:
 15 pages, 8 figures 4 tables. ApJ Accepted