We present a combined strong and weak lensing analysis of the J085007.6+360428 ( J0850 ) field , which was selected by its high projected concentration of luminous red galaxies and contains the massive cluster Zwicky 1953 .
Using Subaru/Suprime-Cam BVR _ { c } I _ { c } i ^ { \prime } z ^ { \prime } imaging and MMT/Hectospec spectroscopy , we first perform a weak lensing shear analysis to constrain the mass distribution in this field , including the cluster at z = 0.3774 and a smaller foreground halo at z = 0.2713 .
We then add a strong lensing constraint from a multiply-imaged galaxy in the imaging data with a photometric redshift of z \approx 5.03 .
Unlike previous cluster-scale lens analyses , our technique accounts for the full three-dimensional mass structure in the beam , including galaxies along the line of sight .
In contrast with past cluster analyses that use only lensed image positions as constraints , we use the full surface brightness distribution of the images .
This method predicts that the source galaxy crosses a lensing caustic such that one image is a highly-magnified “ fold arc ” , which could be used to probe the source galaxy ’ s structure at ultra-high spatial resolution ( < 30 pc ) .
We calculate the mass of the primary cluster to be \mathrm { M _ { vir } } = 2.93 _ { -0.65 } ^ { +0.71 } \times 10 ^ { 15 } ~ { } \mathrm { M _ { \odot } } with a concentration of \mathrm { c _ { vir } } = 3.46 _ { -0.59 } ^ { +0.70 } , consistent with the mass-concentration relation of massive clusters at a similar redshift .
The large mass of this cluster makes J0850 an excellent field for leveraging lensing magnification to search for high-redshift galaxies , competitive with and complementary to that of well-studied clusters such as the HST Frontier Fields .