Suzaku Observations of the cluster of galaxies Abell 2052 (2008)
Tamura, Takayuki, Mitsuda, Kazuhisa, Takei, Yoh, Yamasaki, Noriko Y., ITOH, Akiharu, Hayashida, Kiyoshi, ...
The results from Suzaku XIS observations of the relaxed cluster of galaxies Abell2052 are presented. Offset pointing data are used to estimate the Galactic foreground emission in the direction to the...
On the lack of strong O-line excess in the Coma cluster outskirts from Suzaku (2008)
Takei, Yoh, Miller, Eric D., Bregman, Joel N., Kimura, Shunsuke, Ohashi, Takaya, Mitsuda, Kazuhisa, ...
About half of the baryons in the local Universe are thought to reside in the so-called warm-hot intergalactic medium (WHIM) at temperatures of 0.1-10 million K. Thermal soft excess emission in the...
Suzaku Observations of the North Polar Spur: Evidence for Nitrogen Enhancement (2007)
Miller, Eric D., Tsunemi, Hiroshi, Bautz, Mark W., McCammon, Dan, Fujimoto, Ryuichi, Hughes, John P., ...
We present observations of the North Polar Spur (NPS) using the X-ray Imaging Spectrometer (XIS) aboard the Suzaku X-ray satellite. The NPS is a large region of enhanced soft X-ray and radio emission...
Evidence for solar-wind charge-exchange X-ray emission from the Earth's magnetosheath (2007)
Fujimoto, Ryuichi, Mitsuda, Kazuhisa, McCammon, Dan, Takei, Yoh, Bauer, Michael, Ishisaki, Yoshitaka, ...
The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Evidence for solar-wind charge-exchange X-ray emission from the Earth's magnetosheath (2007)
Fujimoto, Ryuichi, Mitsuda, Kazuhisa, McCammon, Dan, Takei, Yoh, Bauer, Michael, Ishisaki, Yoshitaka, ...
Suzaku/Chandra emission/absorption line observations of hot gas in and around our galaxy (2007)
Mitsuda, Kazuhisa, Fujimoto, Ryuichi, Yamasaki, Noriko Y., Yoshino, Tomotaka, Hagihara, Toshishige, Masui, Kensuke, ...
Warm-Hot Intergalactic Medium Associated with the Coma Cluster (2006)
Takei, Yoh, Henry, J. Patrick, Finoguenov, Alexis, Mitsuda, Kazuhisa, Tamura, Takayuki, Fujimoto, Ryuichi, ...
We present our XMM-Newton RGS observations of X Comae, an AGN behind the Coma cluster. We detect absorption by NeIX and OVIII at the redshift of Coma with an equivalent width of 3.3+/-1.8 eV and...
Suzaku Observations of the Local and Distant Hot ISM (2006)
Smith, Randall K., Bautz, Mark W., Edgar, Richard J., Hamaguchi, Kenji, Hughes, John P., Ishida, Manabu, ...
Suzaku observed the molecular cloud MBM12 and a blank field less than 3 degrees away to separate the local and distant components of the diffuse soft X-ray background. Towards MBM12, a local (D< 275...
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...
Evidence for Solar-Wind Charge-Exchange X-Ray Emission from the Earth's Magnetosheath (2006)
Fujimoto, Ryuichi, Mitsuda, Kazuhisa, McCammon, Dan, Takei, Yoh, Bauer, Michael, Ishisaki, Yoshitaka, ...
We report an apparent detection of the C VI 4p to 1s transition line at 459 eV, during a long-term enhancement (LTE) in the Suzaku north ecliptic pole (NEP) observation of 2005 September 2. The...
Search for Oxygen Emission from Warm-Hot Intergalactic Medium around A2218 with Suzaku (2006)
Takei, Yoh, Ohashi, Takaya, Henry, J. Patrick, Mitsuda, Kazuhisa, Fujimoto, Ryuichi, Tamura, Takayuki, ...
We searched for redshifted O emission lines from the possible warm-hot intergalactic medium (WHIM) surrounding the cluster of galaxies A2218 at z=0.1756 using the XIS instrument on Suzaku. This...
ASCA Observations of OAO 1657-415 and its Dust-Scattered X-Ray Halo (2006)
Audley, Michael D., Nagase, Fumiaki, Mitsuda, Kazuhisa, Angelini, Lorella, Kelley, Richard L.
We report on two ASCA observations of the high-mass X-ray binary pulsar OAO 1657-415. A short observation near mid-eclipse caught the source in a low-intensity state, with a weak continuum and iron...
L_X-T Relation and Related Properties of Galaxy Clusters (2005)
Ota, Naomi, Kitayama, Tetsu, Masai, Kuniaki, Mitsuda, Kazuhisa
An observational approach is presented to constrain the global structure and evolution of the intracluster medium based on the ROSAT and ASCA distant cluster sample. From statistical analysis of the...
Soft X-ray Transmission Spectroscopy of Warm/Hot Intergalactic Medium with XEUS (2005)
Kawahara, Hajime, Yoshikawa, Kohji, Sasaki, Shin, Suto, Yasushi, Kawai, Nobuyuki, Mitsuda, Kazuhisa, ...
We discuss the detectability of Warm/Hot Intergalactic medium (WHIM) via the absorption lines toward bright point sources with a future X-ray satellite mission, XEUS. While we consider bright QSOs as...
Ueda, Yoshihiro, Mitsuda, Kazuhisa, Murakami, Hiroshi, Matsushita, Kyoko
We study the composition of the Galactic interstellar medium (ISM) toward the Galactic center region (5 < |l| < 20 degree) by utilizing X-ray absorption features of three bright low-mass X-ray...
A uniform X-ray analysis of 79 distant galaxy clusters with ROSAT and ASCA (2004)
We present a uniform analysis of the ROSAT HRI and the ASCA GIS/SIS data for 79 distant clusters of galaxies in the redshift range, 0.1 < z < 0.82 to study the global structures of the intracluster...
Searching for cosmic missing baryons with DIOS -- Diffuse Intergalactic Oxygen Surveyor -- (2004)
Suto, Yasushi, Yoshikawa, Kohji, Yamasaki, Noriko Y., Mitsuda, Kazuhisa, Fujimoto, Ryuichi, Furusho, Tae, ...
Approximately 30 to 50 percent of the total baryons in the present universe is supposed to take a form of warm/hot intergalactic medium (WHIM) whose X-ray continuum emission is very weak. In order to...
Futamoto, Kazuo, Mitsuda, Kazuhisa, Takei, Yoh, Fujimoto, Ryuichi, Yamasaki, Noriko
We searched for absorption lines of highly ionized O and Ne in the energy spectra of two Low-mass X-ray binaries, 4U1820-303 in the globular cluster NGC6624 and Cyg X-2, observed with the Chandra...
Detectability of the Warm/Hot Intergalactic Medium Through Emission Lines of OVII and OVIII (2003)
Yoshikawa, Kohji, Yamasaki, Noriko Y., Suto, Yasushi, Ohashi, Takaya, Mitsuda, Kazuhisa, Tawara, Yuzuru, ...
Most of cosmic baryons predicted by the big-bang nucleosynthesis has evaded the direct detection. Recent numerical simulations indicate that approximately 30 to 50 percent of the total baryons in the...
Chandra Spectroscopy and Mass Estimation of the Lensing Cluster of Galaxies CL0024+17 (2002)
Ota, Naomi, Hattori, Makoto, Pointecouteau, Etienne, Mitsuda, Kazuhisa
We present the X-ray analysis and the mass estimation of the lensing cluster of galaxies CL0024+17 with Chandra. We found that the temperature profile is consistent with being isothermal and the...
O and Ne K absorption edge structures and interstellar abundance towards Cyg X-2 (2002)
Takei, Yoh, Fujimoto, Ryuichi, Mitsuda, Kazuhisa, Onaka, Takashi
We have studied the O and Ne absorption features in the X-ray spectrum of Cyg X-2 observed with the Chandra LETG. The O absorption edge is represented by the sum of three absorption-edge components...
We have performed a uniform analysis of 79 clusters of galaxies with the ROSAT HRI and ASCA to study the X-ray structure and evolution of clusters in the redshift range 0.1 < z < 1. We determined the...
The Nature of Ultra-Luminous Compact X-Ray Sources in Nearby Spiral Galaxies (2000)
Makishima, Kazuo, Kubota, Aya, Mizuno, Tsunefumi, Ohnishi, Tomohisa, Tashiro, Makoto, Aruga, Yoichi, ...
Studies were made of ASCA spectra of seven ultra-luminous compact X-ray sources (ULXs) in nearby spiral galaxies; M33 X-8 (Takano et al. 1994), M81 X-6 (Fabbiano 1988b; Kohmura et al. 1994; Uno...
Ota, Naomi, Mitsuda, Kazuhisa, Hattori, Makoto, Mihara, Tatehiro
We have detected an emission line feature at 4 keV in the X-ray emission from a sky region including the distant radio galaxy 3C220.1(z=0.62) obtained with ASCA. The line energy is 6.1 - 7.0 keV (90%...
Ota, Naomi, Mitsuda, Kazuhisa, Hattori, Makoto, Mihara, Tatehiro
We detected an emission line feature at 4 keV in the X-ray spectrum of a sky region including the distant radio galaxy 3C220.1(z=0.62) obtained with ASCA. The line energy is 6.1 - 7.0 keV (90%...