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In order to elucidate origin of the Galactic Ridge X-ray Emission, weanalyzed Suzaku data taken at various regions along the Galactic plane andstudied their Fe-K emission line features. Suzaku resolved the Fe line complexinto three narrow lines at ~6.4 keV,~6.7 keV and ~6.97 keV, which are K-linesfrom neutral (or low-ionized), He-like, and H-like iron ions, respectively. The6.7 keV line is clearly seen in all the observed regions and its longitudinaldistribution is consistent with that determined from previous observations. The6.4 keV emission line was also found in various Galactic plane regions (b~0).Differences in flux ratios of the 6.4 keV/6.7 keV and 6.97 keV/6.7 keV linesbetween the Galactic plane and the Galactic center regions are studied and itsimplication is discussed.

Iron Emission Lines on the Galactic Ridge Observed with Suzaku