  We present the results of a combined study of ASCA and ROSAT observations of
the distant cluster Abell 2390.We determine the surface brightness profile and
the gas density distribution of the cluster from the ROSAT PSPC and HRI data. A
combined spatially resolved spectral analysis of the ASCA and ROSAT data show
that the temperature distribution of the intracluster medium of A2390 is
consistent with an isothermal temperature distribution in the range 9 to 12 keV
except for the central region for which we find strong evidence of a
multi-temperature structure. We determine the gravitational mass profile of the
cluster and find a mass value of 2e15 solar masses for a radius 3 Mpc. A
comparison of the projected mass profiles of the cluster shows an excellent
agreement between the mass determined from X-ray data and the mass determined
from the models for the gravitational arc and the weak lensing results.
