Relics: Strong lensing analysis of the galaxy clusters abell s295, abell 697, MACS J0025.4-1222 and MACS J0159.8-0849

Nathália Cibirka, Ana Acebron, Adi Zitrin, Dan Coe, Irene Agulli, Felipe Andrade-Santos, Maruša Bradač, Brenda Frye, Rachael C. Livermore, Guillaume Mahler, Brett Salmon, Keren Sharon, Michele Trenti, Keiichi Umetsu, Roberto Avila, Larry Bradley, Daniela Carrasco, Catherine Cerny, Nicole G. Czakon, William A. DawsonAustin T. Hoag, Kuang Han Huang, Traci L. Johnson, Christine Jones, Shotaro Kikuchihara, Daniel Lam, Lorenzo Lovisari, Ramesh Mainali, Pascal A. Oesch, Sara Ogaz, Masami Ouchi, Matthew Past, Rachel Paterno-Mahler, Avery Peterson, Russell E. Ryan, Irene Sendra-Server, Daniel P. Stark, Victoria Strait, Sune Toft, Benedetta Vulcani

Research output: Contribution to journalArticlepeer-review


We present a strong-lensing analysis of four massive galaxy clusters imaged with the Hubble Space Telescope in the Reionization Lensing Cluster Survey. We use a Light-Traces-Mass technique to uncover sets of multiply images and constrain the mass distribution of the clusters. These mass models are the first published for Abell S295 and MACS J0159.8-0849, and are improvements over previous models for Abell 697 and MACS J0025.4-1222. Our analysis for MACS J0025.4-1222 and Abell S295 shows a bimodal mass distribution supporting the merger scenarios proposed for these clusters. The updated model for MACS J0025.4-1222 suggests a substantially smaller critical area than previously estimated. For MACS J0159.8-0849 and Abell 697 we find a single peak and relatively regular morphology, revealing fairly relaxed clusters. Despite being less prominent lenses, three of these clusters seem to have lensing strengths, i.e. cumulative area above certain magnification, similar to the Hubble Frontier Fields clusters (e.g., A(µ > 5) ∼ 1 − 3 arcmin2, A(µ > 10) ∼ 0.5 − 1.5 arcmin2), which in part can be attributed to their merging configurations. We make our lens models publicly available through the Mikulski Archive for Space Telescopes. Finally, using Gemini-N/GMOS spectroscopic observations we detect a single emission line from a high-redshift J125 ' 25.7 galaxy candidate lensed by Abell 697. While we cannot rule out a lower-redshift solution, we interpret the line as Lyα at z = 5.800 ± 0.001, in agreement with its photometric redshift and dropout nature. Within this scenario we measure a Lyα rest-frame equivalent width of 52 ± 22 Å and an observed Gaussian width of 117 ± 15 km/s.

Original languageEnglish (US)
JournalUnknown Journal
StatePublished - Mar 26 2018


  • Abell 697
  • Clusters: individual: Abell S295
  • Galaxies: clusters: general
  • Gravitational lensing: strong
  • MACS J0025.4-1222
  • MACS J0159.8-0849

ASJC Scopus subject areas

  • General

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