Thermo-dynamic and chemical properties of the Intra-Cluster Medium

Details Thermo-dynamic and chemical properties of the Intra-Cluster Medium Thermo-dynamic and chemical properties of the Intra-Cluster Medium

2009-10-26

arxiv.org/abs/0910.4894v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

To appear in Astronomy & Astrophysics

Scientific paper

Aims. We aim to provide constraints on evolutionary scenarios in clusters. One of our main goals is to understand whether, as claimed by some, the cool core/non-cool core division is established once and for all during the early history of a cluster. Methods. We employ a sample of about 60 objects to classify clusters according to different properties: we characterize cluster cores in terms of their thermo-dynamic and chemical properties and clusters as a whole in terms of their dynamical properties. Results. We find that: I) the vast majority of merging systems feature high entropy cores (HEC); II) objects with lower entropy cores feature more pronounced metallicity peaks than objects with higher entropy cores. We identify a small number of medium (MEC) and high (HEC) entropy core systems which, unlike most other such objects, feature a large central metallicity. The majority of these outliers are mergers, i.e. systems far from their equilibrium configuration. Conclusions. We surmise that medium (MEC) and high (HEC) entropy core systems with a large central metallicity recently evolved from low entropy core (LEC) clusters that have experienced a heating event associated to AGN or merger activity.

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