We have obtained intensity profiles of the Fe \emissiontypeI, Fe \emissiontypeXVV, and Fe \emissiontypeXXVI Kα lines in the Galactic center region of \timeform−3D<l<\timeform2D and \timeform−2D<b<\timeform1D.

We analyzed an archival data set of GS 1826−238 taken on 2009 October 21. Although the luminosity at 0.8–100 keV was rather high at 1.5×1037erg s−1, the source was in the hard state. The 0.8–100 keV persistent spectrum of GS 1826−238 was explained s…

We analyzed an archival data of Aql X-1 taken with Suzaku on 2011 October 21 for a gross duration of 80 ks. The source underwent a transition from the hard state to the soft state, on a time scale of ∼30 ks. We have successfully explained the spectr…

Using the Suzaku XIS and HXD data acquired on three occasions in 2006 January, we studied broad-band X-ray spectra and variations of MCG–6-30-15. On the first two occasions, the hard X-ray (15.0–45.0 keV) intensity variations at 10 ks binning were c…

The fine-tuned position of Suzaku J174035.6−301416 at (α,δ)2000=(\timeform17h40m35.6s,\timeform−30D14m16s) is different from that of PSR B1737−30 at (α,δ)2000=(\timeform17h40m33.82s,\timeform−30D15m43.5s) (Fomalont et al., 1997). The X-ray spectra o…

Utilizing the archival Suzaku data of Aquila X-1 in an outburst, we successfully obtained high-quality spectra on two occasions, and performed quantitative model fitting to both spectra. The obtained results are summarized as follows.

We have performed re-calibration of the energy scale of the GSO scintillators which covers the harder energy ranges of the Suzaku HXD. Through laboratory experiments using flight-spare hardware, we found that the pedestal of HXD-AE decreased by 8 ch…