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

Characterization of diffuse X-ray emission from IGR~J17448-3232: an implication of a line of sight merging activity