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Kelson, Guillermo A. Blanc, Konstantina Boutsia, Thomas Connor","submitted_at":"2019-05-02T18:01:29Z","abstract_excerpt":"We present a catalog of spectroscopic redshifts for SPT-CLJ0615$-$5746, the most distant cluster in the Reionization Lensing Cluster Survey (RELICS). Using Nod & Shuffle multi-slit observations with LDSS-3 on Magellan, we identify ${\\sim}50$ cluster members and derive a cluster redshift of $z_c = 0.972$, with a velocity dispersion of $\\sigma = 1235 \\pm 170\\ \\textrm{km}\\ \\textrm{s}^{-1}$. We calculate a cluster mass using a $\\sigma_{200}-M_{200}$ scaling relation of $M_{200} = (9.4 \\pm 3.6) \\times 10^{14}\\ M_\\odot$, in agreement with previous, independent mass measurements of this cluster. 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