Abstract
From the 1 million second Suzaku exposure in the Galactic center region, ever-highest-statistics broad-band spectra of the Galactic Ridge X-ray Emission (GRXE) were extracted. The spectra showed emission lines from multiple atoms, and this manifests co-existence of low and high temperature thermal plasma in the origin(s) of the GRXE. After careful treatment of the instrument background and response, we constructed a spectral fitting model consisting of a low-temperature thermal plasma component (assuming numerous unresolved coronal X-ray sources like the sun) and the spectral model of magnetized white dwarf star. The total model reproduced the observed spectra very well with reasonable model parameters and mixing ratio of the two components. In addition to the spectral-shape discussion, number density of the point-like X-ray sources which are required to compose the total GRXE flux was also estimated by comparing an observed X-ray flux and a number-luminosity distribution that was reported in high-angular-resolution studies of the Galactic dim point-like sources. Combining the spectral fitting result and the number density calculation, the thesis is concluded with a proposal of most probable origins of the GRXE, namely numerous coronal X-ray sources and white dwarf binaries.
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