Mass Modeling of Frontier Fields Cluster MACS J1149.5+2223 Using Strong and Weak Lensing

May 2018 • 2018ApJ...859...58F

Authors • Finney, Emily Quinn • Bradač, Maruša • Huang, Kuang-Han • Hoag, Austin • Morishita, Takahiro • Schrabback, Tim • Treu, Tommaso • Borello Schmidt, Kasper • Lemaux, Brian C. • Wang, Xin • Mason, Charlotte

Abstract • We present a gravitational-lensing model of MACS J1149.5+2223 using ultra-deep Hubble Frontier Fields imaging data and spectroscopic redshifts from HST grism and Very Large Telescope (VLT)/MUSE spectroscopic data. We create total mass maps using 38 multiple images (13 sources) and 608 weak-lensing galaxies, as well as 100 multiple images of 31 star-forming regions in the galaxy that hosts supernova Refsdal. We find good agreement with a range of recent models within the HST field of view. We present a map of the ratio of projected stellar mass to total mass (f _⋆) and find that the stellar mass fraction for this cluster peaks on the primary BCG. Averaging within a radius of 0.3 Mpc, we obtain a value of < {f}_\star> ={0.012}_-0.003^+0.004, consistent with other recent results for this ratio in cluster environments, though with a large global error (up to δf _⋆ = 0.005) primarily due to the choice of IMF. We compare values of f _⋆ and measures of star formation efficiency for this cluster to other Hubble Frontier Fields clusters studied in the literature, finding that MACS1149 has a higher stellar mass fraction than these other clusters but a star formation efficiency typical of massive clusters.

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Takahiro Morishita

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