Yoshiaki Hyodo

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We have observed the diffuse X-ray emission from the Galactic center (GC) using the X-ray Imaging Spectrometer (XIS) on Suzaku. The high-energy resolution and the low-background orbit provide excellent spectra of the GC diffuse X-rays (GCDX). The XIS found many emission lines in the GCDX near the energy of K-shell transitions of iron and nickel. The most(More)
We have observed a typical Galactic plane field at (l, b) = (2846,−020) with Suzaku for 100 ksec to carry out a precise spectral study of the Galactic Ridge X-ray Emission (GRXE). The field is known to be devoid of X-ray point sources brighter than ∼2×10ergs s cm (2–10 keV), and already deeply observed with Chandra. Thanks to the low and stable background(More)
We observed the bright unidentified TeV γ-ray source HESS J1616−508 with the X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-ray counterpart was found to a limiting flux of 3.1×10 erg s cm in the 2–10 keV band, which is some 60 times below the γ-ray flux in the 1– 10 TeV band. This object is bright in TeV γ-rays but very dim in the X-ray(More)
The high energy resolution and low background, particularly in the hard X-ray band, of the X-ray Imaging Spectrometer onboard Suzaku provide excellent spectra of the Galactic center diffuse X-rays (GCDX). This paper reports on the results of spatially resolved spectroscopy of GCDX. The most pronounced features of GCDX are the K-shell transition lines from(More)
The radio complex Sgr B region is observed with the X-Ray Imaging Spectrometers (XIS) on board Suzaku. This region exhibits diffuse iron lines at 6.4, 6.7 and 6.9 keV, which are Kα lines of Fe I (neutral iron), FeXXV (He-like iron) and FeXXVI (H-like iron), respectively. The high energy resolving power of the XIS provides the separate maps of the K-shell(More)
We report the diffuse X-ray emissions from the Sgr A and B regions observed with Suzaku. From the Sgr A region, we found many K-shell transition lines of iron and nickel. The brightest are Kα lines from FeI, FeXXV and FeXXVI at 6.4 keV, 6.7 keV and 6.9 keV. In addition, Kα lines of NiI and NiXXVII, Kβ of FeI, FeXXV and FeXXVI, and Kγ of FeXXV and FeXXVI are(More)
Practical usefulness of a teleradiology system using CCD camera, personal computer and telephone line was evaluated in a daily clinical practice. Image quality of this system is diagnostic for the majority of abnormalities on radiological images including plain radiographs. Radiological consultation between hospitals in the same city as well as between(More)
The eclipsing low-mass X-ray binary AX J1745.6–2901 was observed with Suzaku in its outburst phase. Combining the Chandra observation made 1.5 month earlier than Suzaku, the orbital period is determined to be 30063.76±0.14 s. We found deep flux dips prior to the eclipse phase of orbit. The X-ray spectrum in the persistent phase is described with a(More)
We made a 100 ks observation of the Sagittarius (Sgr) B1 region at (l, b) = (0.5, −0.1) near to the Galactic center (GC) with the Suzaku/XIS. Emission lines of SXV, Fe I , FeXXV, and FeXXVI were clearly detected in the spectrum. We found that the FeXXV and FeXXVI line emissions smoothly distribute over the Sgr B1 and B2 regions connecting from the GC. This(More)
The extended X-ray emission from ’the Cap’ region located 11 (11.6 kpc) above the disk of the starburst galaxy M82 has been observed with Suzaku and XMM-Newton. Owing to the good energy resolution and the large collecting area of the XIS on Suzaku, combined with similar properties of the EPIC instrument on XMM-Newton, we have clearly detected K-shell(More)