Scaling Properties of X-ray Clusters: The Chandra View

Details Scaling Properties of X-ray Clusters: The Chandra View Scaling Properties of X-ray Clusters: The Chandra View

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004ap%26ss.294...45t&link_type=abstract

Astrophysics and Space Science, Volume 294, Issue 1-2, pp. 45-50

Astronomy and Astrophysics

Astrophysics

Galaxies: Clusters

Scientific paper

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 = 0.8 is Z Fe = 0.25+0.04 -0.06 Z &sun;, and at ˜ 1.2 is Z Fe = 0.35+0.06 -0.05 Z &sun;, both measures consistent with no evolution with respect to the local value Z Fe≃ 0.3 Z &sun;. 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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