  We present the analysis of baryonic and non-baryonic matter distribution in a
sample of ten nearby clusters ($0.03<z<0.09$) with temperatures between 4.7 and
9.4 keV. These galaxy clusters have been studied in detail using X-ray data and
global physical properties have been determined. Correlations between these
quantities have been analysed and compared with the results for distant
clusters. We found an interesting dependence between the relative gas extent
(expressed as the ratio of gas mass fractions at $r_{500}$ and $0.5\times
r_{500}$) and the total cluster mass. The extent of the gas relative to the
extent of the dark matter tends to be larger in less massive clusters. This
dependence might give us some hints about non-gravitational processes in
clusters. The new X-ray satellites Chandra and XMM yield exciting new results
for galaxy cluster physics and cosmology. We show the interesting X-ray
observations of two intermediate redshift clusters, RBS797 ($z=0.35$) and CL
0939+4713 ($z=0.41$) taken with Chandra and XMM respectively.

Astrophysics