TY - JOUR
T1 - RELICS
T2 - Strong Lensing Analysis of the Galaxy Clusters Abell S295, Abell 697, MACS J0025.4-1222, and MACS J0159.8-0849
AU - Cibirka, Nathália
AU - Acebron, Ana
AU - Zitrin, Adi
AU - Coe, Dan
AU - Agulli, Irene
AU - Andrade-Santos, Felipe
AU - Bradač, Maruša
AU - Frye, Brenda
AU - Livermore, Rachael C.
AU - Mahler, Guillaume
AU - Salmon, Brett
AU - Sharon, Keren
AU - Trenti, Michele
AU - Umetsu, Keiichi
AU - Avila, Roberto
AU - Bradley, Larry
AU - Carrasco, Daniela
AU - Cerny, Catherine
AU - Czakon, Nicole G.
AU - Dawson, William A.
AU - Hoag, Austin T.
AU - Huang, Kuang Han
AU - Johnson, Traci L.
AU - Jones, Christine
AU - Kikuchihara, Shotaro
AU - Lam, Daniel
AU - Lovisari, Lorenzo
AU - Mainali, Ramesh
AU - Oesch, Pascal A.
AU - Ogaz, Sara
AU - Ouchi, Masami
AU - Past, Matthew
AU - Paterno-Mahler, Rachel
AU - Peterson, Avery
AU - Ryan, Russell E.
AU - Sendra-Server, Irene
AU - Stark, Daniel P.
AU - Strait, Victoria
AU - Toft, Sune
AU - Vulcani, Benedetta
N1 - Funding Information:
We would like to thank the reviewer of this work for useful comments. This work is based on observations taken by the RELICS Treasury Program (GO-14096) with the NASA/ESA HST. Program GO-14096 is supported by NASA through a grant from the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS5-26555. This work was performed in part under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory under contract DE-AC52-07NA27344. RCL acknowledges support from an Australian Research Council Discovery Early Career Researcher Award (DE180101240). Based in part on observations obtained at the Gemini Observatory, which is operated by the Association of Universities for Research in Astronomy, Inc., under a cooperative agreement with the NSF on behalf of the Gemini partnership: the National Science Foundation (United States), the National Research Council (Canada), CONICYT (Chile), Ministerio de Ciencia, Tecnología e Innovación Productiva (Argentina), and Ministério da Ciência, Tecnologia e Inovação (Brazil). Data were retrieved through the Gemini Observatory Archive and processed using the Gemini IRAF package. We thank Michael Lundquist for very useful help with the Gemini data reduction.
Publisher Copyright:
© 2018. The American Astronomical Society. All rights reserved..
PY - 2018/8/20
Y1 - 2018/8/20
N2 - 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 multiple 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 those of 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 J 125 ≃ 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-1.
AB - 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 multiple 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 those of 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 J 125 ≃ 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-1.
KW - galaxies: clusters: general
KW - galaxies: clusters: individual (Abell S295, Abell 697, MACS J0025.4- 1222, MACS J0159.8-0849)
KW - gravitational lensing: strong
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U2 - 10.3847/1538-4357/aad2d3
DO - 10.3847/1538-4357/aad2d3
M3 - Article
AN - SCOPUS:85052374029
VL - 863
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 2
M1 - 145
ER -