A massive protocluster of galaxies at a redshift of z ≈ 5.3

@article{Capak2011AMP,
  title={A massive protocluster of galaxies at a redshift of z ≈ 5.3},
  author={Peter Capak and Dominik A. Riechers and Nicholas Z. Scoville and Christopher L. Carilli and Pierre Cox and Roberto Neri and Brant E. Robertson and Mara Salvato and Eva Schinnerer and Lin Yan and Grant W. Wilson and Min S. Yun and Francesca Maria Civano and Martin Elvis and Alexander Karim and Bahram Mobasher and Johannes G. Staguhn},
  journal={Nature},
  year={2011},
  volume={470},
  pages={233-235}
}
Massive clusters of galaxies have been found that date from as early as 3.9 billion years (3.9 Gyr; z = 1.62) after the Big Bang, containing stars that formed at even earlier epochs. Cosmological simulations using the current cold dark matter model predict that these systems should descend from ‘protoclusters’—early overdensities of massive galaxies that merge hierarchically to form a cluster. These protocluster regions themselves are built up hierarchically and so are expected to contain… 
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