Why Do Only Some Galaxy Clusters Have Cool Cores?

Understand

Flux-limited X-ray samples indicate that about half of rich galaxy clusters have cool cores.

• Why do only some clusters have cool cores while others do not? In this paper, cosmological N-body + Eulerian hydrodynamic simulations, including radiative cooling and heating, are used to address this question as we examine the formation and evolution of cool core (CC) and non-cool core (NCC) clusters.
• These adaptive mesh refinement simulations produce both CC and NCC clusters in the same volume.
• They have a peak resolution of 15.6 h^{-1} kpc within a (256 h^{-1} Mpc)^3 box.