Galaxy clusters seen in X-rays: from the most relaxed to the most perturbed
Résumé
We present recent X-rays, optical and radio observations of the rich clusters of galaxies Abell 85, 496, 2667, and 3376. Detailed analysis of these clusters shows that none of them is strictly relaxed, all of them revealing to some degree signs of recent dynamical activity. We show how temperature maps and multi-wavelength observations are powerful tools to probe the history of galaxy clusters.