Yuasa, Takayuki, Nakazawa, Kazuhiro, Makishima, Kazuo
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...
Suzaku Observation of the Metallicity in the Interstellar Medium of NGC 4258 (2009)
Konami, Saori, Sato, Kosuke, Matsushita, Kyoko, Yamada, Shin'ya, Isobe, Naoki, Senda, Atsushi, ...
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...
An Antarctic ice core recording both supernovae and solar cycles (2009)
Motizuki, Yuko, Takahashi, Kazuya, Makishima, Kazuo, Bamba, Aya, Nakai, Yoichi, Yano, Yasushige, ...
Ice cores are known to be rich in information regarding past climates, and the possibility that they record astronomical phenomena has also been discussed. Rood et al. were the first to suggest, in...
Kawaharada, Madoka, Makishima, Kazuo, Kitaguchi, Takao, Okuyama, Sho, Nakazawa, Kazuhiro, Matsushita, Kyoko, ...
The elliptical galaxy NGC 1550 at a redshift of $z=0.01239$, identified with an extended X-ray source RX J0419+0225, was observed with {\it XMM-Newton} for 31 ks. From the X-ray data and archival...
Modeling and Reproducibility of Suzaku HXD PIN/GSO Background (2009)
Fukazawa, Yasushi, Mizuno, Tsunefumi, Watanabe, Shin, Kokubun, Motohide, Takahashi, Hiromitsu, Kawano, Naomi, ...
Suzaku Hard X-ray Detector (HXD) achieved the lowest background level than any other previously or currently operational missions sensitive in the energy range of 10--600 keV, by utilizing PIN...
XEUS: the physics of the hot evolving universe (2009)
Arnaud, Monique, Barcons, Xavier, Barret, Didier, Bautz, Marshall, Bellazzini, Ronaldo, Bleeker, Johan, ...
Hard X-ray properties of the merging cluster Abell 3667 as observed with Suzaku (2009)
Nakazawa, Kazuhiro, Sarazin, Craig L., Kawaharada, Madoka, Kitaguchi, Takao, Okuyama, Sho, Makishima, Kazuo, ...
Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku (2008)
Nakazawa, Kazuhiro, Sarazin, Craig L., Kawaharada, Madoka, Kitaguchi, Takao, Okuyama, Sho, Makishima, Kazuo, ...
Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in the wide energy band from 0.5...
Suzaku Results on the Obscured Low-Luminosity Active Galactic Nucleus in NGC 4258 (2008)
Yamada, Shin'ya, Itoh, Takeshi, Makishima, Kazuo, Nakazawa, Kazuhiro
In 2006 June, the obscured low luminosity active galactic nucleus in the nearby Seyfert 1.9 galaxy NGC 4258 was observed with Suzaku for ~ 100 ks. Utilizing the XIS and the HXD, the nucleus emission...
Spectral transitions of an ultraluminous X-ray source, NGC 2403 Source 3 (2008)
Isobe, Naoki, Makishima, Kazuo, Takahashi, Hiromitsu, Mizuno, Tsunefumi, Miyawaki, Ryouhei, Gandhi, Poshak, ...
Suzaku observation of an ultraluminous X-ray source, NGC 2403 Source 3, performed on 2006 March 16--17, is reported. The Suzaku XIS spectrum of Source 3 was described with a multi-color...
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...
Timing and Spectral Study of AX J1745.6-2901 with Suzaku (2008)
Hyodo, Yoshiaki, Ueda, Yoshihiro, Yuasa, Takayuki, Maeda, Yoshitomo, Makishima, Kazuo, Koyama, Katsuji
The eclipsing low-mass X-ray binary AX J1745.6-2901 was observed with Suzaku in its outburst phase. Combining the Chandra observation made 1.5 month earlier than Suzaku, we determined the orbital...
Kawano, Naomi, Fukazawa, Yasushi, Nishino, Sho, Nakazawa, Kazuhiro, Kitaguchi, Takao, Makishima, Kazuo, ...
Clusters of galaxies are among the best candidates for particle acceleration sources in the universe, a signature of which is non-thermal hard X-ray emission from the accelerated relativistic...
Suzaku Results on Cygnus X-1 in the Low/Hard State (2008)
Makishima, Kazuo, Takahashi, Hiromitsu, Yamada, Shin'ya, Done, Chris, Kubota, Aya, Dotani, Tadayasu, ...
The black-hole binary Cygnus X-1 was observed for 17 ks with the Suzaku X-ray observatory in 2005 October, while it was in a low/hard state with a 0.7-300 keV luminosity of 4.6 x 10^37 erg/s. The XIS...
ASCA OBSERVATIONS OF THE SPECTRUMOF THE X-RAY BACKGROUND (2007)
Keith C. Gendreau, Richard Mushotzky, Andrew C. Fabian, Tsuneo Kii, Stephen S. Holt, Peter J. Serlemitsos, ...
We present initial results from ASCA on the spectrum of the Cosmic X-ray Background from 0.4 to 10 keV. About 250 ksec of deep survey data has been collected from the performance verification phase...
In Orbit Timing Calibration of the Hard X-Ray Detector on Board Suzaku (2007)
Terada, Yukikatsu, Enoto, Teruaki, Miyawaki, Ryouhei, Ishisaki, Yoshitaka, Dotani, Tadayasu, Ebisawa, Ken, ...
The hard X-ray detector (HXD) on board the X-ray satellite Suzaku is designed to have a good timing capability with a 61 $\mu$s time resolution. In addition to detailed descriptions of the HXD timing...
Terada, Yukikatsu, Hayashi, Takayuki, Ishida, Manabu, Mukai, Koji, Dotani, Tadayas U, Okada, Shunsaku, ...
The fast rotating magnetized white dwarf, AE Aquarii, was observed with Suzaku, in October 2005 and October 2006 with exposures of 53.1 and 42.4 ks, respectively. In addition to clear spin modulation...
Suzaku Detection of Extended/Diffuse Hard X-Ray Emission from the Galactic Center (2007)
Yuasa, Takayuki, Tamura, Ken-ichi, Nakazawa, Kazuhiro, Kokubun, Motohide, Makishima, Kazuo, Bamba, Aya, ...
Five on-plane regions within +/- 0.8deg of the Galactic center were observed with the Hard X-ray Detector (HXD) and the X-ray Imaging Spectrometer (XIS) onboard Suzaku. From all regions, significant...
Suzaku Observations of Hercules X-1 : Measurements of the Two Cyclotron Harmonics (2007)
Enoto, Teruaki, Makishima, Kazuo, Terada, Yukikatsu, Mihara, Tatehiro, Nakazawa, Kazuhiro, Ueda, Tsuyoshi, ...
The accretion-powered pulsar Her X-1 was observed with Suzaku twice in its main-on state, on 2005 October 5-6 and 2006 March 29-30, for a net exposure of 30.5 ks and 34.4 ks, respectively. In the...
Discovery of a bright transient ultraluminous X-ray source Suzaku J1305-4931 in NGC 4945 (2007)
Isobe, Naoki, Kubota, Aya, Makishima, Kazuo, Gandhi, Poshak, Griffiths, Richard E., Dewangan, Gulab C., ...
This paper reports the discovery of a bright X-ray transient source, Suzaku J1305-4913, in the south-west arm of the nearby Seyfert II galaxy NGC 4945. It was detected at a 0.5 -- 10 keV flux of $2.2...
Suzaku wide-band X-ray Spectroscopy of the Seyfert 2 AGN in NGC 4945 (2007)
Itoh, Takeshi, Done, Chris, Makishima, Kazuo, Madejski, Grzegorz, Awaki, Hisamitsu, Isobe, Naoki, ...
Suzaku observed a nearby Seyfert 2 galaxy NGC4945, which hosts one of the brightest active galactic nuclei above 20 keV. Combining data from the X-ray CCD camera (XIS) and the Hard X-ray Detector...
Effects of Compton scattering on the Gamma Ray Spectra of Solar flares (2007)
Kotoku, Jun'ichi, Makishima, Kazuo, Matsumoto, Yukari, Kohama, Mitsuhiro, Terada, Yukikatsu, Tamagawa, Toru
Using fully relativistic GEANT4 simulation tool kit, the transport of energetic electrons generated in solar flares was Monte-Carlo simulated, and resultant bremsstrahlung gamma-ray spectra were...
Low/Hard State Spectra of GRO J1655-40 Observed with Suzaku (2007)
Takahashi, Hiromitsu, Fukazawa, Yasushi, Mizuno, Tsunefumi, Hirasawa, Ayumi, Kitamoto, Shunji, Sudoh, Keisuke, ...
The Galactic black-hole binary GRO J1655$-$40 was observed with Suzaku on 2005 September 22--23, for a net exposure of 35 ks with the X-ray Imaging Spectrometer (XIS) and 20 ks with the Hard X-ray...
Wide-band spectroscopy of the Compton thick Seyfert 2 galaxy Mrk 3 with Suzaku (2007)
Awaki, Hisamitsu, Anabuki, Naohisa, Fukazawa, Yasuchi, Gallo, Luigi, Ikeda, Shinya, Isobe, Naoki, ...
We obtained a wide-band spectrum of the Compton-thick Seyfert 2 galaxy Mrk 3 with Suzaku. The observed spectrum was clearly resolved into weak, soft power-law emission, a heavily absorbed power-law...
A multi band study of the optically dark GRB 051028 (2007)
Urata, Yuji, Huang, Kui-Yun, Kuo, Ping-Hung, Ip, Wing-Huen, Qiu, Yulei, Masuno, Keisuke, ...
Observations were made of the optical afterglow of GRB 051028 with the Lulin observatory's 1.0 m telescope and the WIDGET robotic telescope system. R band photometric data points were obtained on...
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...
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, ...
Hard X-Ray Properties of Groups of Galaxies as Observed with ASCA (2006)
Nakazawa, Kazuhiro, Makishima, Kazuo, Fukazawa, Yasushi
X-ray spectra of groups of galaxies, obtained with the GIS instrument onboard ASCA, were investigated for diffuse hard X-rays in excess of the soft thermal emission from their inter-galactic medium...
Kubota, Aya, Dotani, Tadayasu, Cottam, Jean, Kotani, Taro, Done, Chris, Ueda, Yoshihiro, ...
We present the results of six Suzaku observations of the recurrent black hole transient 4U1630-472 during its decline from outburst from February 8 to March 23 in 2006. All observations show the...
Tsunoda, Naoko, Kubota, Aya, Namiki, Masaaki, Sugiho, Masahiko, Kawabata, Kiyoshi, Makishima, Kazuo
We report on the results of detailed spectral studies of the ultra-luminous X-ray source (ULX), M81 X-9 (Holmberg IX X-1), made with XMM-Newton on 2001 April 22 and with ASCA on 1999 April 6. On both...
Ota, Naomi, Fukazawa, Yasushi, Fabian, Andrew C., Kanemaru, Takehiro, Kawaharada, Madoka, Kawano, Naomi, ...
The Centaurus cluster (z=0.0104) was observed with the X-ray Imaging Spectrometer (XIS) onboard the Suzaku X-ray satellite in three pointings, one centered on the cluster core and the other two...
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,...
Ezoe, Yuichiro, Kokubun, Motohide, Makishima, Kazuo, Sekimoto, Yutaro, Matsuzaki, Keiichi
A deep 75 ks {\it Chandra} ACIS--I data of NGC 2024 was analyzed, aiming at a search for diffuse X-ray emission in this one of the most nearby (415 pc) massive star-forming regions. After removing...
Nakajima, Motoki, Mihara, Tatehiro, Makishima, Kazuo, Niko, Hisako
The present paper reports on the RXTE observations of the binary X-ray pulsar 4U0115+63, covering an outburst in 1999 March-April with 44 pointings. The 3-30 keV PCA spectra and the 15-50 keV HEXTE...
Gaseous abundances in M82 (2005)
Ranalli, Piero, Comastri, Andrea, Origlia, Livia, Maiolino, Roberto, Makishima, Kazuo
We present the preliminary analysis of a deep (100ks) XMM-Newton observation of M82. The spatial distribution of the abundances of chemical elements (Fe, O, Ne, Mg, Si, S) is investigated through...
Investigation of Diffuse Hard X-ray Emission from the Massive Star-Forming Region NGC 6334 (2005)
Ezoe, Yuichiro, Kokubun, Motohide, Makishima, Kazuo, Sekimoto, Yutaro, Matsuzaki, Keiichi
Chandra ACIS-I data of the molecular cloud and HII region complex NGC 6334 were analyzed. The hard X-ray clumps detected with ASCA (Sekimoto et al. 2000) were resolved into 792 point sources. After...
Three Spectral States of the Disk X-Ray Emission of the Black-Hole Candidate 4U 1630-47 (2005)
Abe, Yukiko, Fukazawa, Yasushi, Kubota, Aya, Kasama, Daisuke, Makishima, Kazuo
We studied a time history of X-ray spectral states of a black-hole candidate, 4U 1630-47, utilizing data from a number of monitoring observations with the Rossi X-Ray Timing Explorer over 1996--2004....
Observational studies of stellar black hole binaries and ULXs (2005)
We outline a framework for understanding the X-ray spectra of high mass accretion rate stellar black holes based on X-ray data from RXTE and ASCA. Three spectral regimes can be separated out by the...
Kubota, Aya, Ebisawa, Ken, Makishima, Kazuo, Nakazawa, Kazuhiro
X-ray spectra of black hole binaries(BHBs) in the high/soft state were studied comprehensively by using ASCA GIS data, and partially RXTE PCA data. A mathematical disk model was applied to several...
Murashima, Mio, Kubota, Aya, Makishima, Kazuo, Kokubun, Motohide, Hong, Soojing, Negoro, Hitoshi
An analysis was made of 0.3-15 keV X-ray spectra of a Narrow-Line Seyfert 1 Galaxy, Ton S180, using archival data from ASCA, RXTE, and XMM-Newton. At energies above 2.5 keV, a power-law with a photon...
Canonical Particle Acceleration in FRI Radio Galaxies (2005)
Young, Andrew, Rudnick, Lawrence, Katz, Debora, DeLaney, Tracey, Kassim, Namir E., Makishima, Kazuo
Matched resolution multi-frequency VLA observations of four radio galaxies are used to derive the asymptotic low energy slope of the relativistic electron distribution. Where available, low energy...
A Statistical Study of Gamma-Ray Emitting Solar Flares Observed with Yohkoh (2005)
Matsumoto, Yukari, Makishima, Kazuo, Kotoku, Jun'ichi, Yoshimori, Masato, Suga, Kazuharu, Kosugi, Takeo, ...
Gamma-ray emitting solar flares observed with Yohkoh were analyzed from a statistical viewpoint. The four-band hard X-ray (15--95 keV) photometric data, taken with the Hard X-ray Telescope onboard...
Fukazawa, Yasushi, Makishima, Kazuo, Ohashi, Takaya
Utilizing ASCA archival data of about 300 objects of elliptical galaxies, groups, and clusters of galaxies, we performed systematic measurements of the X-ray properties of hot gas in their systems,...
XMM-Newton and Chandra Observations of the Central Region of M31 (2004)
Takahashi, Hiromitsu, Okada, Yuu, Kokubun, Motohide, Makishima, Kazuo
The archival XMM-Newton data of the central region of M31 were analyzed for diffuse X-ray emission. Point sources with the 0.5--10 keV luminosity exceeding $\sim 4 \times 10^{35}$ erg s$^{-1}$ were...
The Anisotropic Transfer of Resonance Photons in Hot Plasmas on Magnetized White Dwarfs (2004)
Terada, Yukikatsu, Ishida, Manabu, Makishima, Kazuo
In order to confirm the anisotropic effect of resonance photons in hot accretion columns on white dwarfs in magnetic cataclysmic variables, proposed by Terada etal (2001), systematic studies with...
The present paper describes the analysis of multiple RXTE/PCA data of the black hole binary with superluminal jet, XTE J1550-564, acquired during its 1999--2000 outburst. The X-ray spectra show...
Evidence for Jet Collimation in SS 433 with the Chandra HETGS (2003)
Namiki, Masaaki, Kawai, Nobuyuki, Kotani, Taro, Makishima, Kazuo
High-resolution X-ray spectra of SS 433 obtained after a binary egress with the Chandra High Energy Transmission Grating Spectrometer (HETGS) were studied. Many Doppler-shifted X-ray emission lines...
A new candidate for the dark group of galaxies, RX J0419+0225 (2003)
Kawaharada, Madoka, Makishima, Kazuo, Takahashi, Isao, Nakazawa, Kazuhiro, Matsushita, Kyoko, Shimasaku, Kazuhiro, ...
Long-term X-ray variability of quasars in the Lockman Hole field observed with ROSAT (2002)
Ezoe, Yu-ichiro, Iyomoto, Naoko, Makishima, Kazuo, Hasinger, Gunter
An improved method is utilized to estimate the X-ray power spectral densities (PSD) and the variation time scales of three quasars in the Lockman Hole field. Five archival ROSAT PSPC data covering...
Kubota, Aya, Done, Chris, Makishima, Kazuo
The ultraluminous compact X-ray sources (ULXs) generally show a curving spectrum in the 0.7--10 keV ASCA bandpass, which looks like a high temperature analogue of the disk dominated high/soft state...
Search for Hot Gas in the Local Group with ASCA (2002)
Osone, Satoko, Makishima, Kazuo, Matsuzaki, Keiichi, Ishisaki, Yoshitaka, Fukazawa, Yasushi
An X-ray study was made to examine whether some part of the soft X-ray background is coming from hot gas in the Local Group. For this purpose, four consecutive pointings were made with ASCA toward a...
Long-term X-ray variability of quasars in the Lockman Hole field observed with ROSAT (2002)
Ezoe, Yu-ichiro, Iyomoto, Naoko, Makishima, Kazuo, Hasinger, Günther
An improved method has been utilized to estimate the X-ray power spectral densities (PSD) and the variation time scales of three quasars in the Lockman Hole field. Five archival ROSAT PSPC data...
ASCA Observations of the Central Regions of M31 (2001)
Takahashi, Hiromitsu, Okada, Yuu, Kokubun, Motohide, Makishima, Kazuo
Using ASCA, spatially integrated X-ray spectra of the central regions of M31 were studied. Data were accumulated over three different circular regions, with the radii of 3', 6' and 12', all centered...
Fukazawa, Yasushi, Iyomoto, Naoko, Kubota, Aya, Matsumoto, Yukari, Makishima, Kazuo
We observed the nearby galaxy M~51 (NGC 5194) with BeppoSAX. The X-ray properties of the nucleus below 10 keV are almost the same as the ASCA results regarding the hard component and the neutral Fe...
Observational Evidence for Strong Disk Comptonization in GRO J1655-40 (2001)
Kubota, Aya, Makishima, Kazuo, Ebisawa, Ken
Analysis was made of the multiple XTE/PCA data on the promised black hole candidate with superluminal jet, GRO J1655-40, acquired during its 1996--1997 outburst. The X-ray spectra can be adequately...
X-Ray Probing of the Central Regions of Clusters of Galaxies (2001)
Makishima, Kazuo, Ezawa, Hajime, Fukazawa, Yasushi, Honda, Hirohiko, Ikebe, Yasushi, Kamae, Tuneyoshi, ...
Results of ASCA X-ray study of central regions of medium-richness clusters of galaxies are summarized, emphasizing differences between cD and non-cD clusters. The intra-cluster medium (ICM) is likely...
Detection of Excess Hard X-ray Emission from the Group of Galaxies HCG62 (2000)
Fukazawa, Yasushi, Nakazawa, Kazuhiro, Isobe, Naoki, Makishima, Kazuo, Matsushita, Kyoko, Ohashi, Takaya, ...
From the group of galaxies HCG62, we detected an excess hard X-ray emission in energies above $\sim 4$ keV with \A SCA. The excess emission is spatially extended up to $\sim10'$ from the group...
Discovery of Spectral Transitions from Two Ultra-Luminous Compact X-Ray Sources in Ic342 (2000)
Kubota, Aya, Mizuno, Tsunefumi, Makishima, Kazuo, Fukazawa, Yasushi, Kotoku, Jun'ichi, Ohnishi, Tomohisa, ...
Two {\it ASCA} observations were made of two ultra-luminous compact X-ray sources (ULXs), Source 1 and Source 2, in the spiral galaxy IC 342. In the 1993 observation, Source 2 showed a 0.5--10 keV...
Observations of the BL Lacertae Object OJ 287 in 1997 April and Nov ember (2000)
Isobe, Naoki, Tashiro, Makoto, Sugiho, Masahiko, Makishima, Kazuo
X-ray properties of the BL Lacertae object OJ 287, observed with ASCA on 1997 April 26 and November 17, are reported. The 0.5 -- 10 keV flux was lower than those obtained in previous X-ray...
Study of the Long-Term X-Ray Variability of a Possible Quasar RX J0957.9+6903 with ASCA (2000)
Ezoe, Yu-ichiro, Iyomoto, Naoko, Makishima, Kazuo
Long-term variability and spectral properties of a possible quasar, RX J0957.9+6903, were studied, utilizing 16 ASCA observations spanning 5.5 years. The average 0.7--10 keV spectrum of RX...
Long-Term Variability of the Low-Luminosity Active Galactic Nucleus of M81 (2000)
Iyomoto, Naoko, Makishima, Kazuo
Long-term X-ray variability of the low-luminosity active galactic nucleus of M81 was studied, using 16 ASCA observations spanning 5.5 years. The object exhibits a factor three variation over the 5.5...
ASCA Observations of Three Shakhbazyan's Compact Groups of Galaxies (2000)
Takahashi, Isao, Fukazawa, Yasushi, Kodaira, Keiichi, Makishima, Kazuo, Nakazawa, Kazuhiro, Xu, Haiguang
X-ray observations of three Shakhbazyan's Compact Groups of Galaxies, SCGG 202, SCGG 205, and SCGG 223, are presented for the first time. Extended X-ray emission was detected from SCGG 202 and SCGG...
Metal Abundances in the Hot Interstellar Medium in Early-Type Galaxies Observed with ASCA (2000)
Matsushita, Kyoko, Ohashi, Takaya, Makishima, Kazuo
We have analyzed ASCA data of 27 early-type galaxies, and studied the properties of their X-ray emitting ISM (Inter Stellar Medium) in detail. We found that overlapping lines and free-bound continuum...
Tamura, Takayuki, Makishima, Kazuo, Fukazawa, Yasushi, Ikebe, Yasushi, Xu, Haiguang
X-ray spectral and imaging data from ASCA and ROSAT were used to measure the total mass profile in the central region of Abell 1060, a nearby and relatively poor cluster of galaxies. The ASCA X-ray...
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...
Ueda, Yoshihiro, Takahashi, Tadayuki, Ishisaki, Yoshitaka, Ohashi, Takaya, Makishima, Kazuo
We present first results from the ASCA Medium Sensitivity Survey (AMSS; or the GIS catalog project). From the serendipitous fields amounting to 106 degE-2, we determined the Log N - Log S relations...
Mizuno, Tsunefumi, Ohnishi, Tomohisa, Kubota, Aya, Makishima, Kazuo, Tashiro, Makoto
The edge-on spiral galaxy NGC 4565 was observed for $\sim$ 35 ks with ASCA in the 0.5-10 keV energy band. The X-ray emission was dominated by two bright sources, which can be identified with two...
Two-Phased Intra-Cluster Medium in the Centaurus Cluster of Galaxies (1999)
Ikebe, Yasushi, Makishima, Kazuo, Fukazawa, Yasushi, Tamura, Takayuki, Xu, Haiguang, Ohashi, Takaya, ...
ASCA and ROSAT data of the Centaurus cluster were analyzed. A central excess in the radial brightness profile is found in the hard energy band up to 10keV. This requires a deeper central potential...
The Declined Activity in the Nucleus of NGC 1316 (1998)
Iyomoto, Naoko, Makishima, Kazuo, Tashiro, Makoto, Inoue, Susumu, Kaneda, Hidehiro, Matsumoto, Yukari, ...
NGC 1316 (Fornax A) is a radio galaxy with prototypical double lobes, where the magnetic field intensity is accurately measured via the inverse-Compton technique. The radio-emitting electrons in the...
Low-luminosity X-ray Active Nuclei in S0 galaxies NGC 3065 and NGC 4203 (1998)
Iyomoto, Naoko, Makishima, Kazuo, Matsushita, Kyoko, Fukazawa, Yasushi, Tashiro, Makoto, Ohashi, Takaya
We present ASCA X-ray results on two S0 galaxies, NGC 3065 and NGC 4203. In both galaxies, we detected hard X-ray emission from a point-like source at the nucleus. Single power law model having a...
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...
ASCA Measurements of Silicon and Iron Abundances in the Intracluster Medium (1998)
Fukazawa, Yasushi, Makishima, Kazuo, Tamura, Takayuki, Ezawa, Hajime, Xu, Haiguang, Ikebe, Yasushi, ...
We analyzed the ASCA X-ray data of 40 nearby clusters of galaxies, whose intracluster-medium temperature distributes in the range of 0.9--10 keV. We measured the Si and Fe abundances of the...
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...
Suto, Yasushi, Makishima, Kazuo, Ishisaki, Yoshitaka, Ogasaka, Yasushi
Since recent X-ray observations have revealed that most clusters of galaxies are surrounded by an X-ray emitting gaseous halo, it is reasonable to expect that the Local Group of galaxies has its own...