RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z = 0.972 Cluster
Journal
Date Issued
2018
Author(s)
Paterno-Mahler, Rachel
•
Sharon, Keren
•
Coe, Dan
•
Mahler, Guillaume
•
Cerny, Catherine
•
Johnson, Traci L.
•
Schrabback, Tim
•
Andrade-Santos, Felipe
•
Avila, Roberto J.
•
Bradač, Maruša
•
Bradley, Larry D.
•
Carrasco, Daniela
•
Czakon, Nicole G.
•
Dawson, William A.
•
Frye, Brenda L.
•
Hoag, Austin T.
•
Huang, Kuang-Han
•
Jones, Christine
•
Lam, Daniel
•
Livermore, Rachael
•
•
Mainali, Ramesh
•
Oesch, Pascal A.
•
Ogaz, Sara
•
Past, Matthew
•
Peterson, Avery
•
Ryan, Russell E.
•
Salmon, Brett
•
Sendra-Server, Irene
•
Stark, Daniel P.
•
Umetsu, Keiichi
•
•
Zitrin, Adi
Abstract
We present a lens model for the cluster SPT-CLJ0615-5746, which is the highest-redshift (z = 0.972) system in the Reionization of Lensing Clusters Survey, making it the highest-redshift 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 cluster-sized halo in one of our models; however, two different statistical tests find the best-fit model consists of one cluster-sized halo combined with three individually optimized galaxy-sized 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 Sunyaev-Zel’dovich effect (M ∼ 1015 M ☉). This cluster is lensing a previously reported z ∼ 10 galaxy, which, if spectroscopically confirmed, will be the highest-redshift strongly lensed galaxy known.
Volume
863
Issue
2
Start page
154
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...863..154P
Rights
open.access
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