Search Publications
Suzaku Observations of the Hard X-Ray Variability of MCG -6-30-15: the Effects of Strong Gravity around a Kerr Black Hole
Fabian, Andrew C.; Kunieda, Hideyo; Haba, Yoshito +21 more
Suzaku has, for the first time, enabled the hard X-ray variability of the Seyfert 1 galaxy MCG -6-30-15 to be measured. The variability in the 14-45keV band, which is dominated by a strong reflection hump, is quenched relative to that at a few keV. This directly demonstrates that the whole reflection spectrum is much less variable than the power-l…
Revealing the High Energy Emission from the Obscured Seyfert Galaxy MCG-5-23-16 with Suzaku
Kunieda, Hideyo; Okajima, Takashi; Yaqoob, Tahir +19 more
We report on a 100ks Suzaku observation of the bright, nearby (z=0.008486) Seyfert 1.9 galaxy MCG-5-23-16. The broad-band (0.4-100keV) X-ray spectrum allows us to determine the nature of the high energy emission with little ambiguity. The X-ray continuum consists of a cutoff power-law of photon index Γ=1.9, absorbed through Compton-thin matter of …
X-Ray Study of Temperature and Abundance Profiles of the Cluster of Galaxies Abell 1060 with Suzaku
Ishida, Manabu; Sato, Kosuke; Fukazawa, Yasushi +14 more
We carried out observations of the central and 20' east offset regions of the cluster of galaxies Abell 1060 with Suzaku. Spatially resolved X-ray spectral analysis has revealed temperature and abundance profiles of Abell 1060 out to 27' ≃ 380 h70-1 kpc, which corresponds to ∼ 0.25 r180. Temperature decrease of the…
Discoveries of Diffuse Iron Line Sources from the Sgr B Region
Maeda, Yoshitomo; Koyama, Katsuji; Matsumoto, Hironori +8 more
The radio complex Sgr B region was observed with the X-ray Imaging Spectrometer (XIS) on board Suzaku. This region exhibits diffuse iron lines at 6.4, 6.7, and 6.9keV, which are Kα lines of Fe I (neutral iron), Fe XXV (He-like iron), and Fe XXVI (H-like iron), respectively. The high energy resolving power of the XIS provided separate maps of the K…
X-Ray Spectral Study of the Extended Emission, `the Cap', Located 11.6kpc above the Disk of M82
Koyama, Katsuji; Mitsuda, Kazuhisa; Fujimoto, Ryuichi +11 more
The extended X-ray emission from `the Cap' region, located 11' (11.6kpc) above the disk of the starburst galaxy M82, has been observed with Suzaku and XMM-Newton. Owing to the good energy resolution and the large collecting area of the XIS on Suzaku, combined with similar properties of the EPIC instrument on XMM-Newton, we have clearly detected K-…
Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle Accelerator
Mori, Hideyuki; Porter, Frederick S.; Kokubun, Motohide +15 more
We observed the bright unidentified TeV γ-ray source HESS J1616-508 with the X-ray Imaging Spectrometers onboard the Suzaku satellite. No X-ray counterpart was found to a limiting flux of 3.1 × 10-13 erg s-1 cm-2 in the 2-10keV band, which is some 60-times below the γ-ray flux in the 1-10TeV band. This object is br…
Suzaku Observation of Diffuse X-Ray Emission from the Carina Nebula
Hamaguchi, Kenji; Petre, Robert; Tsujimoto, Masahiro +9 more
We studied extended X-ray emission from the Carina Nebula taken with the Suzaku CCD camera XIS on 2005 August 29.The X-ray morphology, plasma temperature, and absorption to the plasma are consistent with the earlier Einstein results.The Suzaku spectra newly revealed emission lines from various species, including oxygen, but not from nitrogen.This …
Chandra Detections of Diffuse X-Ray Emission from Globular Clusters
Kokubun, Motohide; Makishima, Kazuo; Yuasa, Takayuki +1 more
Using Chandra, extended X-ray emission was detected from the direction of 6 globular clusters: 47 Tucanae, NGC 6752, M 5, ω Centauri, M 80, and NGC 6266. These X-ray sources, extending to a few arcmin, are located 1'--6' away from the cluster centers, and some are found in the direction of cluster motion through the Galactic halo. All of these sou…