Kavli Affiliate: Michael D. Gladders
| First 5 Authors: Grace Smith, Grace Smith, , ,
| Summary:
We present a strong lensing analysis and reconstruct the mass distribution of
SPT-CL J0356-5337, a galaxy cluster at redshift z = 1.034. Our model supersedes
previous models by making use of new multi-band HST data and MUSE spectroscopy.
We identify two additional lensed galaxies to inform a more well-constrained
model using 12 sets of multiple images in 5 separate lensed sources. The three
previously-known sources were spectroscopically confirmed by Mahler et al.
(2020) at redshifts of z = 2.363, z = 2.364, and z = 3.048. We measured the
spectroscopic redshifts of two of the newly-discovered arcs using MUSE data, at
z = 3.0205 and z = 5.3288. We increase the number of cluster member galaxies by
a factor of three compared to previous work. We also report the detection of
extended Lya emission from several background galaxies. We measure the total
projected mass density of the two major sub-cluster components, one dominated
by the BCG, and the other by a compact group of luminous red galaxies. We find
M_BCG(< 80kpc) = 3.93+0.21-0.14 * 10^13Msun and M_LRG(< 80kpc) = 2.92+0.16
-0.23 * 10^13Msun, yielding a mass ratio of 1.35+0.16 -0.08. The strong lensing
constraints offer a robust estimate of the projected mass density regardless of
modelling assumptions; allowing more substructure in this line of sight does
not change the results or conclusions. Our results corroborate the conclusion
that SPT-CL J0356-5337 is dominated by two mass components, and is likely
undergoing a major merger on the plane of the sky
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