Astronomy and Astrophysics – Astrophysics
Scientific paper
2002-07-06
Astronomy and Astrophysics
Astrophysics
16 pages, 11 figures, invited review at the conference Matter and Energy in Clusters of Galaxies
Scientific paper
The amount and nature of the evolution of the X-ray properties of clusters of galaxies provides information on the formation of structure in the universe and on the properties of the universe itself. The cluster luminosity - temperature relation does not evolve strongly, suggesting that the hot X-ray gas had a more complicated thermodynamic history than simply collapsing into the cluster potential well. Cluster X-ray luminosities do evolve. The dependence of this evolution on redshift and luminosity is characterized using two large high redshift samples. Cluster X-ray temperatures also evolve. This evolution constrains the dark matter and dark energy content of the universe as well as other parameters of cosmological interest.
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