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Ultra-diffuse galaxies (UDGs) are spatially extended, low surface brightnessstellar systems with regular elliptical-like morphology found in large numbersin galaxy clusters and groups. Studies of the internal dynamics and dark mattercontent of UDGs have been hampered by their low surface brightnesses. Weidentified a sample of low-mass early-type post-starburst galaxies, `futureUDGs' in the Coma cluster still populated with young stars, which willpassively evolve into UDGs in the next 5$-$10 Gyr. We collected deepobservations for a sample of low-mass early-type galaxies in the Coma clusterusing MMT Binospec, which includes present-day and future UDGs. We derivedtheir dark matter content within a half-light radius (70$-$95%) and totaldynamical masses ($M_{200}=5.5\cdot10^9-1.4\cdot10^{11} M_{\odot}$) assumingthe Burkert density profile and assess how different proposed evolutionarychannels affect dark and visible matter in UDGs. We also discuss observationalmethodology of present and future UDG studies.

Dark matter content and dynamical masses of ultra-diffuse galaxies in the Coma cluster