Search Publications
The Origin of an Extended X-Ray Emission Apparently Associated with the Globular Cluster 47 Tucanae
Makishima, Kazuo; Nakazawa, Kazuhiro; Yuasa, Takayuki
Using the Suzaku X-ray Imaging Spectrometer, we performed a 130 ks observation of an extended X-ray emission, which was shown by ROSAT and Chandra observations to apparently associate with the globular cluster 47 Tucanae. The obtained 0.5-6 keV spectrum was successfully fitted with a redshifted thin thermal plasma emission model whose temperature …
Another Abundance Inhomogeneity in the South East Limb of the Cygnus Loop
Katsuda, Satoru; Uchida, Hiroyuki; Mori, Koji +2 more
We observed the south east (SE) limb of the Cygnus Loop with Suzaku. Our spatially-resolved spectroscopic study shows that a one-kTe non-equilibrium ionization model represents our spectra fairly well. We find that the metal abundances obtained are all depleted relative to the solar values with a positional dependence along the radial d…
Discoveries of 3 K-Shell Lines of Iron and a Coherent Pulsation of 593s from SAX J1748.2-2808
Koyama, Katsuji; Matsumoto, Hironori; Nobukawa, Masayoshi +1 more
SAX J1748.2-2808 is a unique X-ray object with a flat spectrum and strong emission lines at 6.4--7.0keV. The Suzaku satellite resolved the emission lines into 3 K-shell lines from neutral and highly ionized irons. A clear coherent pulsation with a period of 593s was found from the Suzaku and XMM-Newton archives. These facts favor that SAX J1748.2-…
Broad-Band Spectrum of the Black Hole Candidate IGR J17497-2821 Studied with Suzaku
Dotani, Tadayasu; Yamaoka, Kazutaka; Kokubun, Motohide +9 more
The broad-band 1--300keV Suzaku spectrum of IGR J17497-2821, the X-ray transient discovered by INTEGRAL in 2006 September, is presented. Suzaku observed IGR J17497-2821 on September 25, eight days after its discovery, for a net exposure of about 53 ks. During the Suzaku observation, IGR J17497-2821 is very bright, 2 × 1037erg s-1
X-Ray Studies of HESS J1837-069 with Suzaku and ASCA: a VHE Gamma-Ray Source Originated from the Pulsar Wind Nebula
Dotani, Tadayasu; Ebisawa, Ken; Bamba, Aya +1 more
We present ASCA and Suzaku studies of the TeV source HESS J1837-069, which has not been identified in other wavelengths. We confirm the presence of two X-ray sources in the Suzaku XIS image, AX J1838.0-0655 and AX J1837.3-0652, near both ends of the elongated TeV emission region. The XIS spectra of the two sources were reproduced by an absorbed po…
Particle Propagation in the Galactic Center and Spatial Distribution of Non-Thermal X-Rays
Maeda, Yoshitomo; Kokubun, Motohide; Nakazawa, Kazuhiro +9 more
We showed that if the non-thermal emission from the galactic center in the range 14-40 keV is due to inverse bremsstrahlung emission of subrelativistic protons, their interactions with hot and cold fractions of the interstellar medium are equally important. Our estimation shows that about 30% of the total non-thermal flux from the GC in the range …
Suzaku Observation of the Metallicity in the Interstellar Medium of NGC 4258
Isobe, Naoki; Gandhi, Poshak; Sato, Kosuke +7 more
The Suzaku X-ray satellite observed the nearby spiral galaxy NGC 4258 for a total good exposure time of 100 ks. We present an analysis of the Suzaku XIS data, in which we confirm that the 0.5-2 keV spectra of the interstellar medium (ISM) are well-represented by a two-temperature model. The cool and hot ISM temperatures are 0.23±0.01 and 0.58±0.01…
High-Resolution Near-Infrared Images of the T Tauri Binary System XZ Tauri
Pyo, Tae-Soo; Tamura, Motohide; Hayashi, Masahiko +8 more
We present a high-resolution (∼0.1'' = 14AU) H-band image of XZ Tau, a 0.3''-separated classical T Tauri binary system, taken with the Coronagraphic Imager with Adaptive Optics (CIAO) on the Subaru Telescope. We found a scattered light nebula extending to ∼2.4'' from the secondary, XZ Tau S, in the northeast region of the binary. Its surface brigh…
Suzaku Observations of SN 1987A
Haberl, Frank; Hasinger, Günther; Sturm, Richard +2 more
We report on Suzaku observations of SN1987A in the Large Magellanic Cloud, performed in 2005 November and 2006 June. The observations provide medium resolution X-ray spectra during the phase of the interaction between the supernova blast wave and the inner circumstellar ring. The Suzaku observations complement XMM-Newton and Chandra observations a…
AKARI Far-Infrared Spectroscopic Observations of the Galactic Center Region
Takahashi, H.; Nakagawa, T.; Okada, Y. +5 more
We have observed the Quintuplet- and Arches-cluster regions with the Fourier Transform Spectrometer (FTS) of the Far-Infrared Surveyor (FIS) aboard AKARI to investigate the physical conditions of interstellar matter around the clusters. The FIS-FTS mapping data reveal differences in the spatial distribution among the far-infrared [OIII], [NII], an…