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We present an analysis of the mass distribution inferred from strong lensingby SPT-CL J0356-5337, a cluster of galaxies at redshift z = 1.0359 revealed inthe follow-up of the SPT-SZ clusters. The cluster has an Einstein radius ofErad=14 for a source at z = 3 and a mass within 500 kpc of M_500kpc =4.0+-0.8x10^14Msol. Our spectroscopic identification of three multiply-imagedsystems (z = 2.363, z = 2.364, and z = 3.048), combined with HST F606W-bandimaging allows us to build a strong lensing model for this cluster with an rmsof <0.3'' between the predicted and measured positions of the multiple images.Our modeling reveals a two-component mass distribution in the cluster. One masscomponent is dominated by the brightest cluster galaxy and the other component,separated by ~170 kpc, contains a group of eight red elliptical galaxiesconfined in a ~9'' (~70 kpc) diameter circle. We estimate the mass ratiobetween the two components to be between 1:1.25 and 1:1.58. In addition,spectroscopic data reveal that these two near-equal mass cores have only asmall velocity difference of 300 km/s between the two components. This smallradial velocity difference suggests that most of the relative velocity takesplace in the plane of the sky, and implies that SPT-CL J0356-5337 is a majormerger with a small impact parameter seen face-on. We also assess the relativecontributions of galaxy-scale halos to the overall mass of the core of thecluster and find that within 800 kpc from the brightest cluster galaxy about27% of the total mass can be attributed to visible and dark matter associatedwith galaxies, whereas only 73% of the total mass in the core comes fromcluster-scale dark matter halos.

Strong Lensing Model of SPT-CLJ0356-5337, a Major Merger Candidate at Redshift 1.0359