RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z = 0.972 Cluster

Rachel Paterno-Mahler, Keren Sharon, Dan Coe, Guillaume Mahler, Catherine Cerny, Traci L. Johnson, Tim Schrabback, Felipe Andrade-Santos, Roberto J. Avila, Maruša Bradač, Larry D. Bradley, Daniela Carrasco, Nicole G. Czakon, William A. Dawson, Brenda L. Frye, Austin T. Hoag, Kuang Han Huang, Christine Jones, Daniel Lam, Rachael LivermoreLorenzo Lovisari, Ramesh Mainali, Pascal A. Oesch, Sara Ogaz, Matthew Past, Avery Peterson, Russell E. Ryan, Brett Salmon, Irene Sendra-Server, Daniel P. Stark, Keiichi Umetsu, Benedetta Vulcani, Adi Zitrin

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


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 . 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.

Original languageEnglish
Article number154
JournalAstrophysical Journal
Issue number2
StatePublished - 20 Aug 2018


  • clusters: individual (SPT-CLJ0615-5746)
  • gravitational lensing: strong

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


Dive into the research topics of 'RELICS: A Strong Lens Model for SPT-CLJ0615-5746, a z = 0.972 Cluster'. Together they form a unique fingerprint.

Cite this