Joint Strong and Weak Lensing Analysis of the Massive Cluster Field J0850+3604

Abstract

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 $BV{R}_c{I}_c{i}^{\prime }{z}^{\prime }$ 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 ${\mathrm{M}}_{\mathrm{vir}}=2.93_{-0.65}^{+0.71}\times 10^{15}{\mathrm{M}}_{\odot }$ with a concentration of ${\mathrm{c}}_{\mathrm{vir}}=3.46_{-0.59}^{+0.70}$, 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.

arXiv commentAccepted for publication in The Astrophysical Journal; 14 pages, 13 figures, 3 tables

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