RELICS: Strong-lensing Analysis of the Massive Clusters MACS J0308.9+2645 and PLCK G171.9-40.7

Journal
Date Issued
2018
Author(s)
Acebron, Ana
•
Cibirka, Nathália
•
Zitrin, Adi
•
Coe, Dan
•
Agulli, Irene
•
Sharon, Keren
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Bradač, Maruša
•
Frye, Brenda
•
Livermore, Rachael C.
•
Mahler, Guillaume
•
Salmon, Brett
•
Umetsu, Keiichi
•
Bradley, Larry
•
Andrade-Santos, Felipe
•
Avila, Roberto
•
Carrasco, Daniela
•
Cerny, Catherine
•
Czakon, Nicole G.
•
Dawson, William A.
•
Hoag, Austin T.
•
Huang, Kuang-Han
•
Johnson, Traci L.
•
Jones, Christine
•
Kikuchihara, Shotaro
•
Lam, Daniel
•
•
Mainali, Ramesh
•
Oesch, Pascal A.
•
Ogaz, Sara
•
Ouchi, Masami
•
Past, Matthew
•
Paterno-Mahler, Rachel
•
Peterson, Avery
•
Ryan, Russell E.
•
Sendra-Server, Irene
•
Stark, Daniel P.
•
Strait, Victoria
•
Toft, Sune
•
Trenti, Michele
•
DOI
Abstract
Strong gravitational lensing by galaxy clusters has become a powerful tool for probing the high-redshift universe, magnifying distant and faint background galaxies. Reliable strong-lensing (SL) models are crucial for determining the intrinsic properties of distant, magnified sources and for constructing their luminosity function. We present here the first SL analysis of MACS J0308.9+2645 and PLCK G171.9-40.7, two massive galaxy clusters imaged with the Hubble Space Telescope, in the framework of the Reionization Lensing Cluster Survey (RELICS). We use the light-traces-mass modeling technique to uncover sets of multiply imaged galaxies and constrain the mass distribution of the clusters. Our SL analysis reveals that both clusters have particularly large Einstein radii (θ E > 30″ for a source redshift of z s = 2), providing fairly large areas with high magnifications, useful for high-redshift galaxy searches (∼2 arcmin2 with μ > 5 to ∼1 arcmin2 with μ > 10, similar to a typical Hubble Frontier Fields cluster). We also find that MACS J0308.9+2645 hosts a promising, apparently bright (J ∼ 23.2-24.6 AB), multiply imaged high-redshift candidate at z ∼ 6.4. These images are among the brightest high-redshift candidates found in RELICS. Our mass models, including magnification maps, are made publicly available for the community through the Mikulski Archive for Space Telescopes.
Volume
858
Issue
1
Start page
42
Uri
Url
Issn Identifier
0004-637X
Ads BibCode
2018ApJ...858...42A
Rights
open.access
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