Search Publications
Universal detection of high-temperature emission in X-ray isolated neutron stars
Yoneyama, Tomokage; Hayashida, Kiyoshi; Nakajima, Hiroshi +1 more
Strongly magnetized isolated neutron stars (NSs) are categorized into two families, according mainly to their magnetic field strength. Those with a higher magnetic field of 1014-1015 G are called magnetars, characterized by repeated short bursts, and the others are X-ray isolated neutron stars (XINSs) with 1013 G. …
Temporal and spectral X-ray properties of magnetar SGR 1900+14 derived from observations with NuSTAR and XMM-Newton
Enoto, Teruaki; Bamba, Aya; Odaka, Hirokazu +1 more
X-ray observations play a crucial role in understanding the emission mechanism and relevant physical phenomena of magnetars. We report on X-ray observations made in 2016 of a young magnetar, SGR 1900+14, which is famous for a giant flare in 1998 August. Simultaneous observations were conducted with XMM-Newton and NuSTAR on 2016 October 20 with 23 …
Suzaku observation of Jupiter's X-rays around solar maximum
Miyoshi, Yoshizumi; Ezoe, Yuichiro; Ishikawa, Kumi +6 more
We report on results of imaging and spectral studies of X-ray emission from Jupiter observed by Suzaku. In 2006, Suzaku found diffuse X-ray emission in 1-5 keV associated with Jovian inner radiation belts. It has been suggested that the emission is caused by the inverse-Compton scattering by ultra-relativistic electrons (∼50 MeV) in Jupiter's magn…
XMM-Newton spectrum of the magnetar CXOU J171405.7-381031
Bamba, Aya; Watanabe, Haruka; Shibata, Shinpei +1 more
We observe the magnetar CXOU J171405.7-381031 with XMM-Newton and obtain the most reliable X-ray spectral parameters for this magnetar. After removing the flux from the surrounding supernova remnant CTB 37B, the radiation of CXOU J171405.7-381031 is best described by a two-component model, consisting of a blackbody and power law. We obtain a black…
Characterization of diffuse X-ray emission from IGR J17448-3232: an implication of a line-of-sight merging activity
Akamatsu, Hiroki; Nobukawa, Kumiko K.; Yamauchi, Shigeo +1 more
The results of spectral analysis for the galaxy cluster IGR J17448-3232 are presented. The intracluster medium (ICM) in the central region (r< 300^' ' }, 320kpc) has a high electron temperature plasma of kT_e ∼ 13-15keV, and an ionization temperature estimated from an intensity ratio of Fe XXVI Lyα /Fe XXV Heα lines is lower than the electron t…