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The high energy resolution and low background, particularly in the hard X-rayband, of the X-ray Imaging Spectrometer onboard Suzaku provide excellentspectra of the Galactic center diffuse X-rays (GCDX). This paper reports on theresults of spatially resolved spectroscopy of GCDX. The most pronouncedfeatures of GCDX are the K-shell transition lines from neutral (FeI) andHe-like (FeXXV) irons at energies of 6.4keV and 6.7keV, respectively. Thefluxes of these lines are non-uniformly and asymmetrically distributed withrespect to Sgr A*. The 6.4keV lines are particularly bright on the positiveside of the Galactic longitude (east-side) with clumpy structures. A brightclump near the GC exhibits a time variability over a timescale of a few years.Neither the 6.4keV nor 6.7keV line flux shows close proportionality to thecontinuum flux (5--10keV band); the 6.4keV line shows excess on the high fluxside, and vice versa for the 6.7keV line. On the other hand, the sum of the6.4keV plus 6.7keV line fluxes with a ratio of 1:2 shows good proportionalityto the continuum flux, and hence we phenomenologically decomposed the continuumflux of the GCDX into the 6.4keV- and 6.7keV-associated continuums with a fluxratio of 1:2. Based on these facts, we have tried to estimate the contributionof diffuse and integrated flux of point sources to the GCDX.

Spatial Distribution of the Galactic Center Diffuse X-Rays and the Spectra of the Brightest 6.4keV Clumps