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

In this work, we present a combined strong and weak lensing analysis of the J085007.6+360428 (J0850) field, which contains the massive cluster Zwicky 1953. This field was selected for its high projected concentration of luminous red galaxies. 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 ≈ 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 used 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" that 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 $${M}_{\mathrm{vir}}={2.93}_{-0.65}^{+0.71}\times {10}^{15}\,{M}_{\odot }$$ with a concentration of $${c}_{\mathrm{vir}}={3.46}_{-0.59}^{+0.70}$$, consistent with the mass–concentration relation of massive clusters at a similar redshift. Finally, 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.
ORCiD logo [1] ;  [2] ; ORCiD logo [2] ; ORCiD logo [3] ; ORCiD logo [4] ; ORCiD logo [5] ; ORCiD logo [4]
  1. National Astronomical Observatory of Japan, Tokyo (Japan); Institute of Astronomy and Astrophysics, Academia Sinica (ASIAA), Taipei (Taiwan)
  2. Rutgers Univ., Piscataway, NJ (United States). Department of Physics and Astronomy
  3. Institute of Astronomy and Astrophysics, Academia Sinica (ASIAA), Taipei (Taiwan)
  4. Univ. of Arizona, Tucson, AZ (United States). Steward Observatory
  5. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Publication Date:
Report Number(s):
Journal ID: ISSN 1538-4357; 930215
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 844; Journal Issue: 2; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
OSTI Identifier: