Beyond the Cool Core: The Formation of Cool Core Galaxy Clusters

Details Beyond the Cool Core: The Formation of Cool Core Galaxy Clusters Beyond the Cool Core: The Formation of Cool Core Galaxy Clusters

2006-10-27

arxiv.org/abs/astro-ph/0610850v1

Astronomy and Astrophysics

Astrophysics

6 pages, to appear in proceedings of Heating vs. Cooling in Galaxies and Clusters of Galaxies, MPA/ESO/MPE/USM Joint Astronomy

Scientific paper

Why do some clusters have cool cores while others do not? In this paper, cosmological simulations, including radiative cooling and heating, are used to examine the formation and evolution of cool core (CC) and non-cool core (NCC) clusters. Numerical CC clusters at z=0 accreted mass more slowly over time and grew enhanced cool cores via hierarchical mergers; when late major mergers occurred, the CCs survived the collisions. By contrast, NCC clusters of similar mass experienced major mergers early in their evolution that destroyed embryonic cool cores and produced conditions that prevent CC re-formation. We discuss observational consequences.

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