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Paper: Massive Compact Groups at z∼0.2: Are They the Precursors of Today’s Fossil Groups?
Volume: 421, Galaxies in Isolation: Exploring Nature Versus Nurture
Page: 249
Authors: Carrasco, E. R.; de Oliveira, C. M.
Abstract: We analyze the dynamical properties of two massive compact groups at z∼0.2 that have several properties in common with known fossil groups. The two systems have more than 20 members within a radius of 1 Mpc, velocity dispersions > 700 km s-1, and masses > 2×1014 Msun, similar to that of the most massive fossil groups known. The merging of the central galaxies in these groups would form a galaxy with magnitude Mr∼–24, typical for first – ranked galaxies of fossil groups. Although nearby compact groups with similar properties of these groups are rare, we speculate that such systems occurred more frequently in the past and they may have been the precursors of fossil groups.
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