@inproceedings{oai:jaxa.repo.nii.ac.jp:00004986,
 author = {山内, 茂雄 and Tanaka, Yasuo and Yamauchi, Shigeo},
 book = {宇宙航空研究開発機構特別資料:, JAXA Special Publication: The Energetic Cosmos; from Suzaku to ASTRO-H},
 month = {Feb},
 note = {The 3rd Suzaku international Conference "Energetic Cosmos : from Suzaku to ASTRO-H" (June 29-July 2, 2009. Grand Park Otaru Hotel), Otaru, Hokkaido Japan, The energy spectrum of the Galactic ridge X-ray emission (GRXE) observed with Suzaku is studied in relation to its origin. The multi-temperature spectrum, characterized by distinct He-like and H-like K-lines of all abundant elements, is tested whether it is consistent with the stellar origin of GRXE. It is shown that a combination of a cooling flow model representing cataclysmic variables (CVs) and two-temperature plasma model representing coronally active binaries can well reproduce the observed GRXE spectrum. The result shows that the cooling-flow source contribution is dominant in the cumulative flux, which suggests the presence of many more low-luminosity CVs or sources with CV-like spectrum than currently known. Besides, significant spectral differences are found between the bulge (near the GC) and away from the GC in the flux ratio of the H-like to He-like iron K-lines and in the hardness of the continuum. This would imply that the average properties of CVs or CV-like sources in the bulge are different from those away from the bulge. Another noticeable feature is that the equivalent width of the iron K-lines diminishes quickly with the Galactic latitude. This suggests dilution by a hard non-thermal component having a larger scale height than that of stars., Meeting sponsors: The University of Tokyo, The Institute of Physical and Chemical Research, The Japan Society for the Promotion of Science, 資料番号: AA0064574054, レポート番号: JAXA-SP-09-008E},
 pages = {146--149},
 publisher = {宇宙航空研究開発機構, Japan Aerospace Exploration Agency (JAXA)},
 title = {Characteristics of Energy Spectrum of the Galactic Ridge X-Ray Emission},
 volume = {JAXA-SP-09-008E},
 year = {2010}
}