Nakajima, Hiroshi, Tsuru, Takeshi Go, Nobukawa, Masayoshi, Matsumoto, Hironori, Koyama, Katsuji, Murakami, Hiroshi, ...
This paper reports on the first results of the Suzaku observation in the Sgr C region. We detected four diffuse clumps with strong line emission at 6.4keV, Ka from neutral or low-ionized Fe. One of...
X-Ray Observation of Very High Energy Gamma-Ray Source, HESS J1745-303, with Suzaku (2008)
Bamba, Aya, Yamazaki, Ryo, Kohri, Kazunori, Matsumoto, Hironori, Wagner, Stefan, Puehlhofer, Gerd, ...
Suzaku observations of a TeV unidentified (unID) source, HESS J1745-303, are presented. A possible excess of neutral iron line emission is discovered, and is likely associated with the main part of...
Uchiyama, Hideki, Ozawa, Midori, Matsumoto, Hironori, Tsuru, Takeshi Go, Koyama, Katsuji, Kimura, Masashi, ...
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...
Iron Emission Lines on the Galactic Ridge Observed with Suzaku (2008)
Yamauchi, Shigeo, Ebisawa, Ken, Tanaka, Yasuo, Koyama, Katsuji, Matsumoto, Hironori, Yamasaki, Noriko Y., ...
In order to elucidate origin of the Galactic Ridge X-ray Emission, we analyzed Suzaku data taken at various regions along the Galactic plane and studied their Fe-K emission line features. Suzaku...
Ozawa, Midori, Uchiyama, Hideki, Matsumoto, Hironori, Nakajima, Hiroshi, Koyama, Katsuji, Tsuru, Takeshi Go, ...
The X-ray Imaging Spectrometer (XIS) on board the Suzaku satellite is an X-ray CCD camera system that has superior performance such as a low background, high quantum efficiency, and good energy...
Suzaku Observations of M82 X-1 : Detection of a Curved Hard X-ray Spectrum (2008)
Miyawaki, Ryohei, Makishima, Kazuo, Yamada, Shinya, Gandhi, Poshak, Mizuno, Tsunefumi, Kubota, Aya, ...
A report is presented on Suzaku observations of the ultra-luminous X-ray source X-1 in the starburst galaxy M82, made three time in 2005 October for an exposure of ~ 30 ks each. The XIS signals from...
Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters (2008)
Fujita, Yutaka, Hayashida, Kiyoshi, Nagai, Masaaki, Inoue, Susumu, Matsumoto, Hironori, Okabe, Nobuhiro, ...
We present the analysis of a Suzaku observation of the Ophiuchus galaxy cluster. We confirmed that the cluster has a cool core. While the temperature of the intracluster medium (ICM) decreases toward...
Nobukawa, Masayoshi, Koyama, Katsuji, Matsumoto, Hironori, Tsuru, Takeshi Go
SAX J1748.2$-$2808 is a unique X-ray object with a flat spectrum and strong emission lines at 6.4--7.0 keV. The Suzaku satellite resolved the emission lines into 3 K-shell lines from neutral and...
Koyama, Katsuji, Takikawa, Yojiro, Hyodo, Yoshiaki, Inui, Tatsuya, Nobukawa, Masayoshi, Matsumoto, Hironori, ...
The high energy resolution and low background, particularly in the hard X-ray band, of the X-ray Imaging Spectrometer onboard Suzaku provide excellent spectra of the Galactic center diffuse X-rays...
Inui, Tatsuya, Koyama, Katsuji, Matsumoto, Hironori, Tsuru, Takeshi Go
We investigate long-term X-ray behaviors 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 includes...
Nobukawa, Masayoshi, Tsuru, Takeshi Go, Takikawa, Yojiro, Hyodo, Yoshiaki, Inui, Tatsuya, Nakajima, Hiroshi, ...
We made a 100 ks observation of the Sagittarius (Sgr) B1 region at (l, b) = (0.5, -0.1) near to the Galactic center (GC) with the Suzaku/XIS. Emission lines of S XV, Fe I, Fe XXV, and Fe XXVI were...
Matsumoto, Hironori, Uchiyama, Hideki, Sawada, Makoto, Tsuru, Takeshi G., Koyama, Katsuji, Katagiri, Hideaki, ...
We report the Suzaku results of HESS J1614-518, which is the brightest extended TeV gamma-ray source discovered in the Galactic plane survey conducted using the H.E.S.S. telescope. We discovered...
Suzaku X-Ray Spectroscopy of a Peculiar Hot Star in the Galactic Center Region (2007)
Hyodo, Yoshiaki, Tsujimoto, Masahiro, Koyama, Katsuji, Nishiyama, Shogo, Nagata, Tetsuya, Sakon, Itsuki, ...
We present the results of a Suzaku study of a bright point-like source in the 6.7 keV intensity map of the Galactic center region. We detected an intense FeXXV 6.7 keV line with an equivalent width...
A Time-Variable X-Ray Echo: Indications of a Past Flare of the Galactic-Center Black Hole (2007)
Koyama, Katsuji, Inui, Tatsuya, Matsumoto, Hironori, Tsuru, Takeshi Go
A time-variability study of the neutral iron line flux at 6.40keV in the Sgr B2 region from data of Suzaku and Chandra is presented. The highly ionized iron line at 6.68keV is due to Galactic Center...
Development of an n-channel CCD, CCD-NeXT1, for Soft X-ray Imager onboard the NeXT satellite (2007)
Takagi, Shin-ichiro, Tsuru, Takeshi Go, Inui, Tatsuya, Matsumoto, Hironori, Koyama, Katsuji, Ozawa, Hideki, ...
NeXT (New X-ray Telescope) is the next Japanese X-ray astronomical satellite mission after the Suzaku satellite. NeXT aims to perform wide band imaging spectroscopy. Due to the successful development...
Fujita, Yutaka, Tawa, Noriaki, Hayashida, Kiyoshi, Takizawa, Motokazu, Matsumoto, Hironori, Okabe, Nobuhiro, ...
We present an analysis of a Suzaku observation of the link region between the galaxy clusters A399 and A401. We obtained the metallicity of the intracluster medium (ICM) up to the cluster virial...
The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Suzaku Observation of Diffuse X-ray Emission from the Carina Nebula (2006)
Hamaguchi, Kenji, Petre, Robert, Matsumoto, Hironori, Tsujimoto, Masahiro, Holt, Stephan S., Ezoe, Yuichiro, ...
We studied extended X-ray emission from the Carina Nebula taken with the Suzaku CCD camera XIS on 2005 Aug. 29. The X-ray morphology, plasma temperature and absorption to the plasma are consistent...
Tsuru, Takeshi Go, Ozawa, Midori, Hyodo, Yoshiaki, Matsumoto, Hironori, Koyama, Katsuji, Awaki, Hisamitsu, ...
The extended X-ray emission from 'the Cap' region located 11' (11.6 kpc) above the disk of the starburst galaxy M82 has been observed with Suzaku and XMM-Newton. Owing to the good energy resolution...
Discoveries of Diffuse Iron Line Sources from the Sgr B Region (2006)
Koyama, Katsuji, Inui, Tatsuya, Hyodo, Yoshiaki, Matsumoto, Hironori, Tsuru, Takeshi Go, Maeda, Yoshitomo, ...
The radio complex Sgr B region is observed with the X-Ray Imaging Spectrometers (XIS) on board Suzaku. This region exhibits diffuse iron lines at 6.4, 6.7 and 6.9 keV, which are K$\alpha$ lines of Fe...
Iron and Nickel Line Diagnostics for the Galactic Center Diffuse Emission (2006)
Koyama, Katsuji, Hyodo, Yoshiaki, Inui, Tatsuya, Nakajima, Hiroshi, Matsumoto, Hironori, Tsuru, Takeshi Go, ...
We have observed the diffuse X-ray emission from the Galactic center (GC) using the X-ray Imaging Spectrometer (XIS) on Suzaku. The high-energy resolution and the low-background orbit provide...
Suzaku Observations of HESS J1616-508: Evidence for a Dark Particle Accelerator (2006)
Matsumoto, Hironori, Ueno, Masaru, Bamba, Aya, Hyodo, Yoshiaki, Mori, Hideyuki, Uchiyama, Hideki, ...
We observed the bright unidentified TeV gamma-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 3.1e-13...
Discovery of a possible X-ray counterpart to HESS J1804-216 (2006)
Bamba, Aya, Koyama, Katsuji, Hiraga, Junko S., Hughes, John P., Kohmura, Takayoshi, Kokubun, Motohide, ...
Suzaku deep observations have discovered two highly significant nonthermal X-ray sources, Suzaku J1804$-$2142 (Src 1) and Suzaku J1804$-$2140 (Src 2), positionally coincident with the unidentified...
Chandra Observation of the Starburst Galaxy NGC 2146 (2004)
Inui, Tatsuya, Matsumoto, Hironori, Tsuru, Takeshi Go, Koyama, Katsuji, Matsushita, Satoki, Peck, Alison B., ...
We present six monitoring observations of the starburst galaxy NGC 2146 using the Chandra X-ray Observatory. We have detected 67 point sources in the 8'.7 x 8'.7 field of view of the ACIS-S detector....
Matsushita, Satoki, Kawabe, Ryohei, Kohno, Kotaro, Matsumoto, Hironori, Tsuru, Takeshi G., Vila-Vilaro, Baltasar
We present high spatial resolution (2.3"x1.9" or 43 pc x 36 pc at D = 3.9 Mpc) 100 GHz millimeter-wave continuum emission observations with the Nobeyama Millimeter Array toward an expanding molecular...
Peculiar Chemical Abundances in the Starburst Galaxy M82 and Hypernova Nucleosynthesis (2002)
Umeda, Hideyuki, Nomoto, Ken'ichi, Tsuru, Takeshi Go, Matsumoto, Hironori
X-ray observations have shown that the chemical abundance in the starburst galaxy M82 is quite rich in Si and S compared with oxygen. Such an abundance pattern cannot be explained with any...
X-ray emission from a merger remnant, NGC 7252,the "Atoms-for-Peace" galaxy (2001)
Awaki, Hisamitsu, Matsumoto, Hironori, Tomida, Hiroshi
We observed a nearby merger remnant NGC 7252 with the X-ray satellite ASCA, and detected X-ray emission with the X-ray flux of (1.8+/-0.3)E-13 ergs/s/cm/cm in the 0.5 - 10 keV band. This corresponds...
Missing Link Found? --- The ``runaway'' path to supermassive black holes (2001)
Ebisuzaki, Toshikazu, Makino, Junichiro, Tsuru, Takeshi Go, Funato, Yoko, Zwart, Simon Portegies, Hut, Piet, ...
Observations of stellar kinematics, gas dynamics and masers around galactic nuclei have now firmly established that many galaxies host central supermassive black holes (SMBHs) with masses in the...
Matsumoto, Hironori, Tsuru, Takeshi Go, Fukazawa, Yasushi, Hattori, Makoto, Davis, David S.
We have analyzed the ASCA data of 29 nearby clusters of galaxies systematically, and obtained temperatures, iron abundances, and X-ray luminosities of their intracluster medium (ICM). We also...