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• RELICS : strong lensing analysis of MACS J0417.5–1154 and predictions for observing the magnified high-redshift Universe with JWST.

# RELICS : strong lensing analysis of MACS J0417.5–1154 and predictions for observing the magnified high-redshift Universe with JWST.

Mahler, Guillaume and Sharon, Keren and Fox, Carter and Coe, Dan and Jauzac, Mathilde and Strait, Victoria and Edge, Alastair and Acebron, Ana and Andrade-Santos, Felipe and Avila, Roberto J. and Bradač, Maruša and Bradley, Larry D. and Carrasco, Daniela and Cerny, Catherine and Cibirka, Nathália and Czakon, Nicole G. and Dawson, William A. and Frye, Brenda L. and Hoag, Austin T. and Huang, Kuang-Han and Johnson, Traci L. and Jones, Christine and Kikuchihara, Shotaro and Lam, Daniel and Livermore, Rachael and Lovisari, Lorenzo and Mainali, Ramesh and Ogaz, Sara and Ouchi, Masami and Paterno-Mahler, Rachel and Roederer, Ian U. and Ryan, Russell E. and Salmon, Brett and Sendra-Server, Irene and Stark, Daniel P. and Toft, Sune and Trenti, Michele and Umetsu, Keiichi and Vulcani, Benedetta and Zitrin, Adi (2019) 'RELICS : strong lensing analysis of MACS J0417.5–1154 and predictions for observing the magnified high-redshift Universe with JWST.', Astrophysical journal., 873 (1). p. 96.

## Abstract

Strong gravitational lensing by clusters of galaxies probes the mass distribution at the core of each cluster and magnifies the universe behind it. MACS J0417.5−1154 at z = 0.443 is one of the most massive clusters known based on weak lensing, X-ray, and Sunyaev–Zel'dovich analyses. Here we compute a strong lens model of MACS J0417 based on Hubble Space Telescope imaging observations collected, in part, by the Reionization Lensing Cluster Survey (RELICS), and recently reported spectroscopic redshifts from the MUSE instrument on the Very Large Telescope (VLT). We measure an Einstein radius of ${\theta }_{E}\simeq 36^{\prime\prime}$ at z = 9 and a mass projected within 200 kpc of ${M}_{(200\mathrm{kpc})}={1.78}_{-0.03}^{+0.01}\times {10}^{14}$ M ${}_{\odot }$. Using this model, we measure a ratio between the mass attributed to cluster-member galaxy halos and the main cluster halo of order 1:100. We assess the probability to detect magnified high-redshift galaxies in the field of this cluster, both for comparison with RELICS HST results and as a prediction for the James Webb Space Telescope (JWST) Guaranteed Time Observations upcoming for this cluster. Our lensing analysis indicates that this cluster has similar lensing strength to other clusters in the RELICS program. Our lensing analysis predicts a detection of at least a few z ~ 6–8 galaxies behind this cluster, at odds with a recent analysis that yielded no such candidates in this field. Reliable strong lensing models are crucial for accurately predicting the intrinsic properties of lensed galaxies. As part of the RELICS program, our strong lensing model produced with the Lenstool parametric method is publicly available through the Mikulski Archive for Space Telescopes.

Item Type: Article (VoR) Version of Record Download PDF (3369Kb) Peer-reviewed https://doi.org/10.3847/1538-4357/ab042b 31 January 2019 27 March 2019 07 March 2019 27 March 2019