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Couch","submitted_at":"2025-07-08T05:07:16Z","abstract_excerpt":"We present the analysis of the stellar populations and kinematics of the globular cluster (GC) rich ultra-diffuse galaxy, PUDG-R21, using spectroscopic observations obtained with the Keck Cosmic Web Imager (KCWI). The recessional velocity is measured to be 5536$\\pm$10 km s$^{\\mathrm{-1}}$, confirming its association with the Perseus cluster. The galaxy exhibits mild rotation of 15.6$\\pm$10 km s$^{\\mathrm{-1}}$ and a stellar velocity dispersion of 19.4$\\pm$3.5 km s$^{\\mathrm{-1}}$ within the galaxy effective radius. 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