Research of Galactic Diffuse X-Ray Sources

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In order to investigate the diffuse X-ray emission located in the galactic plane and the galactic bulge region, we analyzed data obtained in scanning and pointing observations with the Ginga satellite. We made an intensity map of a K-line from a He-like iron in an optically thin hot plasma, and confirmed that the optically thin hot plasma has a wide distribution along the galactic plane. The intensity map in the 10-20 keV energy band is similar to that of the iron K-line, and hence the non-thermal X-rays are also found in the large part of the Galaxy.We analyzed ASCA data of supernova remnants detected in the X-ray band for the first time. The X-ray spectrum of G344.7-0.1 exhibited an X-ray emission from an optically thin hot plasma with a temperature of about 9 million K and a strong emission line from a low-ionized iron.The ASCA Galactic plane survey discovered several unidentified diffuse hard X-ray sources. We carried out detailed analysis using data of follow-up observations and a radio intensity map and found that the diffuse sources are candidates for supernova remnants emitting non-thermal X-rays.We analyzed data of a transient X-ray source discovered in the galactic center region with Ginga. We determined its sky position. The X-ray spectra obtained in the several occasions were well represented by either a comptonized blackbody model or a two-temperature blackbody model and the spectral parameters did not change significantly.