SCGG-z5 is a spectroscopically confirmed compact proto-group of six galaxies at z=4.97 within ~16 pkpc, with total stellar mass log M*/Msun=10.07 and dynamics consistent with a dark-matter-dominated halo that simulations suggest will merge into a massive galaxy by z~3-4.
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A Compact Proto-group at $z \sim 5$: A Massive Galaxy Caught in Formation
SCGG-z5 is a spectroscopically confirmed compact proto-group of six galaxies at z=4.97 within ~16 pkpc, with total stellar mass log M*/Msun=10.07 and dynamics consistent with a dark-matter-dominated halo that simulations suggest will merge into a massive galaxy by z~3-4.