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    • A search for the first massive galaxy clusters 

      Willott, C.J.; Crampton, D.; Hutchings, J.B.; Sawicki, M.; Simard, L.; Jarvis, M.J.; McLure, R.J.; Percival, W. (Springer Nature, 2005)
      We have obtained deep, multi-band imaging observations around three of the most distant known quasars at redshifts z > 6. Standard accretion theory predicts that the supermassive black holes present in these quasars were ...