We present results based on XMM- Newton observations of a small sample of hot galaxy clusters .
Making a full use of XMM- Newton ’ s spectro-imaging capabilities , we have extracted the radial temperature profile and gas density profile , and with this information , calculated the total mass profile of each cluster ( under the assumption of hydrostatic equilibrium and spherical symmetry ) .
Comparing the individual scaled total mass profiles , we have probed the Universality of rich cluster mass profiles over a wide range of radii ( from 0.01 to 0.7 the virial radius ) .
We have also tested the shape of cluster mass profiles by comparing with the predicted profiles from numerical simulations of hierarchical structure formation .
We also derived the local mass-temperature ( M - T ) scaling relation over a range of temperature going from 4 to 9 keV , that we compare with theoretical predictions .