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1304.1223
CLASH: Complete Lensing Analysis of the Largest Cosmic Lens MACS J0717.5+3745 and surrounding structures
Medezinski, Umetsu, .. Zitrin, Broadhurst, Donahue, ... Koekemoer, Coe, ... Melchior, ... et al
This cluster at z=0.55 is the largest known cosmic lens, with complex internal structures seen in deep X-ray, SZ and dynamical observations. Perform a combined WL and SL analysis with the wide-field BVRi'z' Subaru/Suprime-Cam observations and 16-band HST observations taken as part of CLASH (Cluster Lensing and Supernova Survey with Hubble). Find: consistent weak distortion and magnification measurements of background galaxies, and combine these signals to construct an optimally estimated radial mass profile of the cluster and its surrounding large-scale structure out to 5 Mpc/h. Find consistency between SL and WL in the region where these independent data overlap <500 kpc/h. The two-dimensional WL map reveals a clear filamentary structure traced by distinct mass haloes. Model the lensing shear field with 9 haloes, including the main cluster, corresponding to mass peaks detected above 2.5 sigma_kappa. The total mass of the cluster as determined by the different methods is M_vir=2.8pm0.4 e15 Msun. Although this is the most massive cluster known at z>0.5, in terms of extreme value statistics we conclude that the mass of this cluster by itself is not in serious tension with LCDM, representing only a 2 sigma departure above the maximum simulated halo mass at this redshift.
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