Search Publications
Modeling and Reproducibility of Suzaku HXD PIN/GSO Background
Isobe, Naoki; Enoto, Teruaki; Yamaoka, Kazutaka +27 more
Suzaku Hard X-ray Detector (HXD) achieved the lowest background level than any other previously or currently operational missions sensitive in the energy range of 10--600keV, by utilizing PIN photodiodes and GSO scintillators mounted in BGO active shields to reject particle background and Compton-scattered events as much as possible. Because it do…
Energy Spectra of the Soft X-Ray Diffuse Emission in Fourteen Fields Observed with Suzaku
Fujimoto, Ryuichi; Yamasaki, Noriko Y.; Wang, Q. Daniel +8 more
The soft diffuse X-ray emission of twelve fields observed with Suzaku are presented together with two additional fields from previous analyses. All have galactic longitudes 65° < l < 295° to avoid contributions from the very bright diffuse source that extends at least 30° from the Galactic center. The surface brightnesses of the Suzaku nine …
Suzaku Observations of Abell 1795: Cluster Emission to r200
Miller, Eric D.; Sanders, Jeremy S.; Hughes, John P. +10 more
We report Suzaku observations of the galaxy cluster Abell 1795 that extend to r_200 ~ 2 Mpc, the radius within which the mean cluster mass density is 200 times the cosmic critical density. These observations are the first to probe the state of the intracluster medium in this object at r > 1.3 Mpc. We sample two disjoint sectors in the cluster o…
New CTI Correction Method for Spaced-Row Charge Injection of the Suzaku X-Ray Imaging Spectrometer
Dotani, Tadayasu; Miller, Eric D.; Mori, Hideyuki +21 more
The charge transfer inefficiency (CTI) of the X-ray CCDs on board the Suzaku satellite (X-ray Imaging Spectrometers; XIS) has increased since the launch due to radiation damage, and the energy resolution has been degraded. To improve the CTI, we have applied a spaced-row charge injection (SCI) technique to the XIS in orbit; by injecting charges in…
Time Variability of the Neutral Iron Lines from the Sagittarius B2 Region and Its Implication of a Past Outburst of Sagittarius A
Koyama, Katsuji; Matsumoto, Hironori; Tsuru, Takeshi Go +1 more
We investigated long-term X-ray behavior from the Sgr B2 complex using archival data of the X-ray satellites Suzaku, XMM-Newton, Chandra, and ASCA. The observed region of the Sgr B2 complex included two prominent spots in the FeI Kα line at 6.40keV, a giant molecular cloud, M0.66-0.02, known as the ``Sgr B2 cloud'' and an unusual X-ray source, G0.…
Hard X-Ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku
Sarazin, Craig L.; Fukazawa, Yasushi; Makishima, Kazuo +10 more
Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in a wide energy band from 0.5 to 40keV. The hard X-ray (>10keV) flux observed by the HXD around the cluster center cannot be explained by a simple extension of the thermal emissio…
The Nature of Unresolved Soft X-Ray Emission from the Galactic Disk
Mitsuda, Kazuhisa; Yamasaki, Noriko Y.; McCammon, Dan +4 more
Although about 40% of the soft X-ray background emission in 0.4 to 1keV range has extragalactic origins and thus is totally blocked by the galactic absorption in midplane directions, it decreases at most by about 20% in midplane. Suzaku observation of the direction, (l, b) = (235°, 0°), showed an OVII Kα emission intensity comparable with that of …
Suzaku Observations of Tycho's Supernova Remnant
Kunieda, Hideyo; Szymkowiak, Andrew; Kokubun, Motohide +19 more
Tycho's supernova remnant was observed by the XIS and HXD instruments onboard the Suzaku satellite on 2006 June 26--29 for 92ks. The spectrum up to 30keV was well fitted with a two-component model, consisting of a power-law with a photon index of 2.7 and a thermal bremsstrahlung model with a temperature of 4.7keV. The former component can alternat…
Design and In-Orbit Performance of the Suzaku Wide-Band All-Sky Monitor
Enoto, Teruaki; Yamaoka, Kazutaka; Endo, Akira +38 more
Suzaku X-Ray Imaging and Spectroscopy of Cassiopeia A
Maeda, Yoshitomo; Ishida, Manabu; Petre, Robert +26 more
Suzaku X-ray observations of a young supernova remnant, Cassiopeia A, were carried out. K-shell transition lines from highly ionized ions of various elements were detected, including Chromium (Cr-Kα at 5.61 keV). The X-ray continuum spectra were modeled in the 3.4-40 keV band, summed over the entire remnant, and were fitted with a simplest combina…