RELICS: Strong-lensing Analysis of the Massive Clusters MACS J0308.9+2645 and PLCK G171.9−40.7
Livermore, Rachael C.
Czakon, Nicole G.
Dawson, William A.
Hoag, Austin T.
Johnson, Traci L.
Oesch, Pascal A.
Ryan, Russell E.
Stark, Daniel P.
AffiliationUniv Arizona, Steward Observ
Keywordsgalaxies: clusters: individual (MACS J0308.9+2645, PLCK G171.9-40.7)
gravitational lensing: strong
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationAna Acebron et al 2018 ApJ 858 42
Rights© 2018. The American Astronomical Society. All rights reserved.
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AbstractStrong 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 (theta(E) > 30 '' for a source redshift of z(s) = 2), providing fairly large areas with high magnifications, useful for high-redshift galaxy searches (similar to 2 arcmin(2) with mu > 5 to similar to 1 arcmin(2) with mu > 10, similar to a typical Hubble Frontier Fields cluster). We also find that MACS J0308.9+2645 hosts a promising, apparently bright (J similar to 23.2-24.6 AB), multiply imaged high-redshift candidate at z similar to 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.
VersionFinal published version
SponsorsNASA/ESA HST [GO-14096]; NASA through a Space Telescope Science Institute [GO-14096]; NASA [NAS5-26555]; U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]; Australian Research Council Discovery Early Career Researcher Award [DE180101240]