Chandra and XMM-Newton Observations of the Bimodal Planck-detected ClusterG345.40-39.34 showing High and Low Entropy Subcluster Cores
Abstract
The recent Sunyaev-Zel'dovich (SZ) surveys (from the Planck mission, the ground based SPT and ACT) have provided complete, nearly mass-limited samples of clusters of galaxies. Through extensive X-ray (Chandra and XMM-Newton) follow-up observations of these SZ cluster samples, one can characterize each cluster in terms of its total mass, X-ray luminosity, gas mass, gas temperature, entropy, central cooling time, and morphology. Here, we present results of Chandra and XMM-Newton observations of G345.40-39.34, a Planck detected cluster. We show that G345.40-39.34 is a nearby (z=0.045) double cluster with its southern subcluster presenting an interesting thermodynamical characteristic: low global gas temperature and very high central entropy. Because these two simultaneous conditions are rare, we selected clusters that exhibit similar properties to compare with G345. Finally, we present discussions of the physical processes that could lead to this unusual thermodynamic state.
- Publication:
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American Astronomical Society Meeting Abstracts #224
- Pub Date:
- June 2014
- Bibcode:
- 2014AAS...22420603A