Search Publications
The soft X-ray background with Suzaku. II. Supervirial temperature bubbles?
Sato, Kosuke; Yamasaki, Noriko Y.; Matsushita, Kyoko +4 more
Observations of the hot X-ray emitting interstellar medium in the Milky Way are important for studying the stellar feedback and for understanding the formation and evolution of galaxies. We present measurements of the soft X-ray background emission for 130 Suzaku observations at 75° < l < 285° and |b| > 15°. With the standard soft X-ray b…
Spectral analysis of the Galactic supernova remnant Kesteven 69 with Suzaku
Yamauchi, Shigeo; Pannuti, Thomas G.
The results of a Suzaku observation of the supernova remnant (SNR) Kesteven 69 = G21.8-0.6 are presented. To estimate the sky background precisely, we conducted a simultaneous fit of the source region spectrum with the background region spectrum and found that the SNR spectrum is well represented by a two-component ionizing plasma model composed o…
Suzaku spectral analysis of an X-ray emitting plasma in the supernova remnant G352.7-0.1
Nobukawa, Masayoshi; Nobukawa, Kumiko K.; Yamauchi, Shigeo +1 more
The results of a Suzaku observation of the supernova remnant (SNR) G352.7-0.1 are presented in this paper. We conducted spectral analysis based on careful sky background estimation and found an emission line from Al at 1.6 keV, in addition to previously detected emission lines from Mg, Si, S, Ar, Ca, and Fe ions. The X-ray spectrum in the 0.7-10 k…
Suzaku and Chandra study of diffuse X-ray emission from the massive star-forming region RCW 38
Ezoe, Yuichiro; Odaka, Hirokazu; Fukushima, Aoto
In some massive star-forming regions, diffuse X-ray emission has been observed. It can be classified as thermal emission from sub- or several-keV plasmas, non-thermal emission represented by the power law, or a mixture of them. We have studied the nearby (~1.7 kpc) young massive star-forming region RCW 38. In a previous study, non-thermal diffuse …
Initial state of the recombining plasma in supernova remnant W 28
Nobukawa, Masayoshi; Nobukawa, Kumiko K.; Yamauchi, Shigeo +2 more
We have investigated supernova remnant (SNR) W 28 using Suzaku archival data, and we report here the results of our spatially resolved analyses. We carried out spectral analyses using a recombining-plasma (RP) model with element-dependent initial ionization temperatures, obtaining ~0.5 keV for Ne, ~0.7 keV for Mg, ~1.0 keV for Si, ~1.2 keV for S, …
X-ray spectroscopy of the accretion disk corona source 2S 0921-630 with Suzaku archival data
Dotani, Tadayasu; Yoneyama, Tomokage
2S 0921-630 is an eclipsing low-mass X-ray binary (LMXB) with an orbital period of ~9 d. Past X-ray observations have revealed that 2S 0921-630 has an extended accretion disk corona (ADC), from which most of the X-rays from the system are emitted. We report the result of our Suzaku archival data analysis of 2S 0921-630. The average X-ray spectrum …
Spectral study of the Galactic ridge X-ray emission with Suzaku: Comparison of the spectral shape with point sources
Nobukawa, Masayoshi; Uchiyama, Hideki; Nobukawa, Kumiko K. +2 more
The Galactic ridge X-ray emission (GRXE) is unresolved X-ray emission located on the Galactic plane, and whether the GRXE comes from truly diffuse plasma or unresolved point sources is still debatable. We present results of spectral analysis of the GRXE with Suzaku. In order to examine the point source origin, we fitted the GRXE spectra in the 1.2…
Modeling of geocoronal solar wind charge exchange events detected with Suzaku
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +2 more
A model of geocoronal solar wind charge exchange (SWCX) emission was built and compared to five Suzaku detections of bright geocoronal SWCX events. An exospheric neutral hydrogen distribution model, charge exchange cross-sections, solar wind ion data taken with the ACE and WIND satellites, and magnetic field models of the Earth's magnetosphere are…