Independent Evidence for Earlier Formation Epochs of Fossil Groups of Galaxies through the Intracluster Light: The Case for RX J100742.53+380046.6

  title={Independent Evidence for Earlier Formation Epochs of Fossil Groups of Galaxies through the Intracluster Light: The Case for RX J100742.53+380046.6},
  author={Renato de Alencar Dupke and Yolanda Jim{\'e}nez-Teja and Yuanyuan Su and Eleazar R. Carrasco and Anton M. Koekemoer and Rebeca M. Batalha and Lucas E. Johnson and Jimmy A. Irwin and Eric Miller and Paola Dimauro and N{\'i}colas O. L. de Oliveira and Jos{\'e} M. V{\'i}lchez},
  journal={The Astrophysical Journal},
Fossil groups (FG) of galaxies still present a puzzle to theories of structure formation. Despite the low number of bright galaxies, they have relatively high velocity dispersions and ICM temperatures often corresponding to cluster-like potential wells. Their measured concentrations are typically high, indicating early formation epochs as expected from the originally proposed scenario for their origin as being older undisturbed systems. This is, however, in contradiction with the typical lack… 



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