Origin of Thermal and Non-Thermal Hard X-ray Emission from the Galactic Center (2009)
Dogiel, Vladimir, Chernyshov, Dmitrii, Yuasa, Takayuki, Prokhorov, Dmitrii, Cheng, Kwong-Sang, Bamba, Aya, ...
We analyse new results of Chandra and Suzaku which found a flux of hard X-ray emission from the compact region around Sgr A$^\ast$ (r ~ 100 pc). We suppose that this emission is generated by...
Particle Propagation in the Galactic Center and Spatial Distribution of Non-Thermal X-rays (2009)
Dogiel, Vladimir, Chernyshov, Dmitrii, Yuasa, Takayuki, Cheng, Kwong-Sang, Bamba, Aya, Inoue, Hajime, ...
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...
Dogiel, Vladimir, Cheng, Kwong-Sang, Chernyshov, Dmitrii, Bamba, Aya, Ichimura, Atsushi, Inoue, Hajime, ...
We analyze the 6.4 keV line and continuum emission from the molecular cloud Sgr B2 and the source HESS J1745-303, which is supposed to be a complex of molecular gas. From the HESS results it follows...
Iron emission lines on the galactic ridge observed with Suzaku (2009)
Yamauchi, Shigeo, Ebisawa, Ken, Tanaka, Yasuo, Koyama, Katsuji, Matsumoto, Hironori, Yamasaki, Noriko Y., ...
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...
X-ray Halo Around the Spiral Galaxy NGC 4631 Observed with Suzaku (2008)
Yamasaki, Noriko Y., Sato, Kosuke, Mitsuishi, Ikuyuki, Ohashi, Takaya
Suzaku observation of the edge-on spiral galaxy NGC 4631 confirmed its X-ray halo extending out to about 10 kpc from the galactic disk. The XIS spectra yielded the temperature and metal abundance for...
Sato, Kosuke, Matsushita, Kyoko, Ishisaki, Yoshitaka, Yamasaki, Noriko Y., Ishida, Manabu, Ohashi, Takaya
Temperature and abundance distributions of the intra-cluster medium (ICM) in the NGC 507 group of galaxies were studied with Suzaku. Observed concentric annular spectra were well-represented by a two...
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...
Tokoi, Kazuyo, Sato, Kosuke, Ishisaki, Yoshitaka, Ohashi, Takaya, Yamasaki, Noriko Y., Nakazawa, Kazuhiro, ...
We present results of 120 ks observation of a compact group of galaxies HCG~62 ($z=0.0145$) with Suzaku XIS and HXD-PIN\@. The XIS spectra for four annular regions were fitted with two temperature...
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...
Sato, Kosuke, Tokoi, Kazuyo, Matsushita, Kyoko, Ishisaki, Yoshitaka, Yamasaki, Noriko Y., Ishida, Manabu, ...
We studied the properties of the intra-cluster medium (ICM) in two clusters of galaxies (AWM 7 and Abell 1060) and two groups (HCG 62 and NGC 507) with the X-ray Observatory Suzaku. Based on...
Suzaku Observations of AWM 7 Cluster of Galaxies: Temperature, Abundance and Bulk Motions (2007)
Sato, Kosuke, Matsushita, Kyoko, Ishisaki, Yoshitaka, Yamasaki, Noriko Y., Ishida, Manabu, Sasaki, Shin, ...
We carried out 3 observations of the cluster of galaxies AWM 7, for the central region and 20'-east and 20'-west offset regions, with Suzaku. Temperature and abundance profiles are measured out to...
Sato, Kosuke, Yamasaki, Noriko Y., Ishida, Manabu, Ishisaki, Yoshitaka, Ohashi, Takaya, Kawahara, Hajime, ...
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...
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, ...
Hard X-ray investigation of the galactic center region with Suzaku (2007)
Kokubun, Motohide, Yuasa, Takayuki, Tamura, Ken-ichi, Makishima, Kazuo, Takahashi, Tadayuki, Nakazawa, Kazuhiro, ...
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...
Matsushita, Kyoko, Fukazawa, Yasushi, Hughes, John P., Kitaguchi, Takao, Makishima, Kazuo, Nakazawa, Kazuhiro, ...
The metallicity distribution in the Fornax cluster was studied with the XIS instrument onboard the Suzaku satellite. K-shell lines of O and Mg were resolved clearly, and the abundances of O, Mg, Si,...
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...
Chandra and XMM-Newton Observations of a Group of Galaxies HCG 62 (2006)
Morita, Umeyo, Ishisaki, Yoshitaka, Yamasaki, Noriko Y., Ota, Naomi, Kawano, Naomi, Fukazawa, Yasushi, ...
We present results from Chandra and XMM-Newton observations of the bright group of galaxies HCG 62. There are two cavities at about 30'' northeast and 20'' southwest of the central galaxy in the...
Detailed XMM-Newton Observation of the Cluster of Galaxies Abell 1060 (2006)
Hayakawa, Akira, Hoshino, Akio, Ishida, Manabu, Furusho, Tae, Yamasaki, Noriko Y., Ohashi, Takaya
We present results from the XMM-Newton observation of the non-cooling flow cluster A1060. Large effective area of XMM-Newton enables us to investigate the nature of this cluster in unprecedented...
Frequency Domain Multiplexing of TES Signals by Magnetic Field Summation (2006)
YAMASAKI, Noriko Y., TAKEI, Yoh, MASUI, Kensuke, MITSUDA, Kazuhisa, MOROOKA, Toshimitsu, NAKAYAMA, Satoshi
In frequency-domain multiplexing (FDM) for TES signals, a magnetic field summation method utilizing a multi-input SQUID has the fundamental merit of small degradation of the signal-to-noise ratio. We...
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...
An X-Ray Detection Possibility of Star-Formation-Bursting Proto-Elliptical Galaxies (2003)
Inoue, Hajime, Yamasaki, Noriko Y.
A possibility to detect X-rays from star-formation burst activities in proto-elliptical galaxies is considered. The X-ray flux of an emission due to inverse Compton scattering of the cosmic microwave...
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...
Study of the X-Ray Background Spectrum and its Large-Scale Fluctuation with ASCA (2002)
Kushino, Akihiro, Ishisaki, Yoshitaka, Morita, Umeyo, Yamasaki, Noriko Y., Ishida, Manabu, Ohashi, Takaya, ...
We studied the energy spectrum and the large-scale fluctuation of the X-ray background with the ASCA GIS based on the ASCA MSS and LSS observations. A total of 91 fields with Galactic latitude |b|>10...
Scaling Relation to Understand Non-Detection of Cold Gas at the Cluster Center (2002)
Sasaki, Shin, Yamasaki, Noriko Y.
Recent XMM-Newton observations of clusters of galaxies have indicated the soft X-ray spectra to be inconsistent with the simple isobaric cooling flow model. There is almost no feature of the cold gas...
Largely Extended X-ray Emission around the Elliptical Galaxy NGC 4636 Observed with ASCA (1998)
Matsushita, Kyoko, Makishima, Kazuo, Ikebe, Yasushi, Rokutanda, Etsuko, Yamasaki, Noriko Y., Ohashi, Takaya
ASCA observations of NGC 4636 and a southern region have revealed extended X-ray emission to a radius of about 300 kpc from the galaxy. The symmetric nature of the observed surface brightness around...
New Measurement of Metal Abundance in the Elliptical Galaxy NGC 4636 with Asca (1997)
Matsushita, Kyoko, Makishima, Kazuo, Rokutanda, Etsuko, Yamasaki, Noriko Y., Ohashi, Takaya
High quality X-ray spectra of NGC 4636 are obtained with ASCA. Theoretical models are found unable to reproduce the data in the Fe-L line region. Spectral data above 1.4 keV indicate that Mg to Si...