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Similarly to the larger Galactic ridge, the Galactic center region presents ahard diffuse emission whose origin has been strongly debated for the past twodecades: does this emission result from the contribution of numerous, yetunresolved, discrete point sources ? Or does it originate in a truly diffuse,hot plasma ?  The Galactic center region (GC) is however different on many respects fromthe outer parts of the Galaxy, which makes the diffuse emission issue at theGalactic center unique. Although recent observations seem to favour a pointsources origin in the far Galactic ridge, the situation is still unclear at theGC and new observations are required.  Here we present results on the modeling of the truly diffuse plasma.Interestingly, such a plasma would strongly affect the dynamics of orbitingmolecular clouds and thus the central engine activity. Discriminating betweenthe two hypothesis has thus become a crucial issue in the understanding of thiscentral region that makes the link between the inner small accretion disk andthe large scale Galactic dynamics. We investigate the new inputs we can expectfrom Simbol-X on this matter.

The diffuse X-ray emission from the Galactic center with Simbol-X