The hierarchical formation of the brightest cluster galaxies

  title={The hierarchical formation of the brightest cluster galaxies},
  author={Gabriella de Lucia and J{\'e}r{\'e}my Blaizot},
We use semi-analytic techniques to study the formation and evolution of brightest cluster galaxies (BCGs). We show the extreme hierarchical nature of these objects and discuss the limitations of simple ways to capture their evolution. In a model where cooling flows are suppressed at late times by AGN activity, the stars of BCGs are formed very early (50 per cent at z ∼ 5, 80 per cent at z ∼ 3) and in many small galaxies. The high star formation rates in these high-z progenitors are fuelled by… CONTINUE READING
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