  Results of the spectral analysis for the galaxy cluster IGR J17448-3232 are
presented. The intracluster medium (ICM) in the central region (r<300", 320
kpc) has a high electron temperature plasma of kTe~13-15 keV and an ionization
temperature estimated from an intensity ratio of Fe XXVI Ly alpha/Fe XXV He
alpha lines is lower than the electron temperature, which suggests that the ICM
is in the non-ionization equilibrium (NEI) state. The spectrum in the central
region can be also fitted with a two-component model: a two-temperature plasma
model in a collisional ionization equilibrium (CIE) with temperatures of 7.9
keV and >34 keV or a CIE+power law model with a temperature of 9.4 keV and a
photon index of 1.1. The two component models can represent the intensity ratio
of Fe XXVI Ly alpha/Fe XXV He alpha lines. On the other hand, the spectrum in
the outer region (r>300'') can be explained by a single CIE plasma model with a
temperature of 5-8 keV. Based on the spectral feature and its circular
structure, we propose that the NEI plasma was produced by merging along the
line-of-sight direction.
