Abstract
The study of X-ray clusters of galaxies, started 30 years ago, has revealed an increasing complexity in the thermodynamics of the X-ray emitting intracluster medium (ICM) as long as the sensitivity and the resolution of the X-ray satellites increased. At the same time, deep surveysdetected several, unexpected, high-z clusters. Here we focus on the Chandra observations of the most distant X-ray selected clusters (0.3 < z < 1.3), in order to constrain their thermodynamic evolution. The X-ray scaling properties show hints of negative evolution in the luminosity–temperature and M gas–temperature relations, and a positive evolution in the entropy–temperature relation. We find that the mean iron abundance at 〈z〉 = 0.8 is Z Fe = 0.25+0.04 −0.06 Z ⊙, and at 〈z〉 ∼ 1.2 is Z Fe = 0.35+0.06 −0.05 Z ⊙, both measures consistent with no evolution with respect to the local value Z Fe≃ 0.3 Z ⊙. These results can provide interesting constraints on the thermodynamics of the ICM at large look back times, pointing towards a redshift z ≳ 2 for the onset of non-gravitational processes.
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Tozzi, P. Scaling Properties of X-ray Clusters: The Chandra View. Astrophys Space Sci 294, 45–50 (2004). https://doi.org/10.1007/s10509-004-4020-8
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DOI: https://doi.org/10.1007/s10509-004-4020-8