Search Publications
Study of the progenitor of the magnetar 1E 2259+586 through Suzaku observations of the associated supernova remnant CTB 109
Enoto, Teruaki; Makishima, Kazuo; Nakano, Toshio +4 more
We present a study of the progenitor of the magnetar 1E 2259+586, from Suzaku observations of the associated supernova remnant CTB 109. The Suzaku spectra, either spatially integrated or spatially resolved, were successfully described by a two-component plasma model, which reconfirms a previous Chandra result on the northwestern part of this remna…
Observational study on the fine structure and dynamics of a solar jet. I. Energy build-up process around a satellite spot
Shibata, Kazunari; Ichimoto, Kiyoshi; Ueno, Satoru +3 more
We report on a solar jet phenomenon associated with successive flares on 2014 November 10. These explosive events were involved with the satellite spots' emergence around a δ-type sunspot in the decaying active region NOAA 12205. The data for this jet were provided by the Solar Dynamics Observatory, the X-Ray Telescope aboard Hinode, and the Inter…
Suzaku observations of spectral variations of the ultra-luminous X-ray source Holmberg IX X-1
Makishima, Kazuo; Nakazawa, Kazuhiro; Kobayashi, Shogo B.
Observations of the ultra-luminous X-ray source (ULX) Holmberg IX X-1 were carried out with Suzaku twice, once on 2012 April 13 and then on 2012 October 24, with exposures of 180 ks and 217 ks, respectively. The source showed a hard power-law shaped spectrum with a mild cutoff at ∼8 keV, which is typical of ULXs when they are relatively dim. On bo…
Surface brightness correction for compact extended sources observed by the AKARI Far-Infrared Surveyor in the slow-scan mode
Shirahata, Mai; Yamamura, Issei; Takita, Satoshi +5 more
We present a general surface brightness correction method for compact extended sources imaged in the slow-scan pointed observation mode of the Far-Infrared Surveyor (FIS) aboard the AKARI infrared astronomical satellite. Our method recovers correct surface brightness distribution maps by rescaling archived raw FIS maps using the surface-brightness…
Suzaku and Chandra observations of the galaxy cluster RXC J1053.7+5453 with a radio relic
Fukazawa, Yasushi; Nakazawa, Kazuhiro; Ohashi, Takaya +10 more
We present the results of Suzaku and Chandra observations of the galaxy cluster RXC J1053.7+5453 (z = 0.0704), which contains a radio relic. The radio relic is located at a distance of ∼540 kpc from the X-ray peak toward the west. We measured the temperature of this cluster for the first time. The resultant temperature in the center is ∼1.3 keV, w…
Temporal relations between magnetic bright points and the solar sunspot cycle
Van Doorsselaere, Tom; Utz, Dominik; Muller, Richard
The Sun shows a global magnetic field cycle traditionally best visible in the photosphere as a changing sunspot cycle featuring roughly an 11-year period. In addition we know that our host star also harbours small-scale magnetic fields often seen as strong concentrations of magnetic flux reaching kG field strengths. These features are situated in …
A broad spectral feature detected during the cooling phase of a type I X-ray burst from GRS 1747-312 with Suzaku
Dotani, Tadayasu; Maeda, Yoshitomo; Mori, Hideyuki +3 more
We analyzed the Suzaku archive data of a type I X-ray burst from GRS 1747-312, a low-mass X-ray binary located in the globular cluster Terzan 6. During the Galactic bulge mapping observations with Suzaku, which covered Terzan 6, an X-ray burst of long duration and with moderate photospheric-radius expansion was serendipitously detected and was con…
Discovery of H2O megamasers in obscured active galactic nuclei
Terashima, Yuichi; Salak, Dragan; Nakai, Naomasa +9 more
A new method to discover obscured active galactic nuclei (AGNs) by utilizing X-ray and infrared data has recently been developed. We carried out a survey of H2O maser emission toward 10 obscured AGNs with the Nobeyama 45 m telescope. We newly detected the maser emission with a signal-noise-ratio (SNR) of above 4 from two AGNs; NGC 1402 …
Suzaku and Chandra observations of CIZA J1700.8-3144, a cluster of galaxies in the Zone of Avoidance
Maeda, Yoshitomo; Mori, Hideyuki; Nakazawa, Kazuhiro +2 more
We present the Chandra and Suzaku observations of 1RXS J170047.8-314442, located towards the Galactic bulge, to reveal a wide-band (0.3-10 keV) X-ray morphology and spectrum of this source. With the Chandra observation, no point source was found at the position of 1RXS J170047.8-314442. Instead, we revealed the presence of diffuse X-ray emission, …
X-ray study of extended emission around M 86 observed with Suzaku
Fujimoto, Ryuichi; Tanaka, Keigo; Hishi, Ukyo +4 more
We analyzed the Suzaku data of M 86 and its adjacent regions to study the extended emission around it. The M 86 core, the plume, and the tail extending toward the northwest were clearly detected, as well as the extended halo around them. From the position angle ∼ 45° to ∼ 275°, the surface brightness distribution of the core and the extended halo …