Ando, Masaki, Kawamura, Seiji, Sato, Shuichi, Nakamura, Takashi, Tsubono, Kimio, Araya, Akito, ...
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory), which is a future space gravitational wave antenna. DECIGO is expected...
Suzaku Wide Band Analysis of the X-ray Variability of TeV Blazar Mrk 421 in 2006 (2009)
Ushio, Masayoshi, Tanaka, Takaaki, Madejski, Grzegorz, Takahashi, Tadayuki, Hayashida, Masaaki, Kataoka, Jun, ...
We present the results of X-ray observations of the well-studied TeV blazar Mrk 421 with the Suzaku satellite in 2006 April 28. During the observation, Mrk 421 was undergoing a large flare and the...
Long-term Stability of Non-thermal X-ray Modulation in the Gamma-ray Binary LS 5039 (2009)
Kishishita, Tetsuichi, Tanaka, Takaaki, Uchiyama, Yasunobu, Takahashi, Tadayuki
We report on long-term stability of X-ray modulation apparently synchronized with an orbital period of 3.9 days in the gamma-ray binary LS 5039. Recent observations with the Suzaku satellite in the...
Suzaku Observations of PSR B1259-63: A New Manifestation of Relativistic Pulsar Wind (2009)
Uchiyama, Yasunobu, Tanaka, Takaaki, Takahashi, Tadayuki, Mori, Koji, Nakazawa, Kazuhiro
We observed PSR B1259-63, a young non-accreting pulsar orbiting around a Be star SS 2883, eight times with the Suzaku satellite in 2007, to characterize the X-ray emission arising from the...
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, ...
Suzaku Observations of Extreme MeV Blazar SWIFT J0746.3+2548 (2008)
Watanabe, Shin, Sato, Rie, Takahashi, Tadayuki, Kataoka, Jun, Madejski, Greg, Sikora, Marek, ...
We report the Suzaku observations of the high luminosity blazar SWIFT J0746.3+2548 (J0746) conducted in November 2005. This object, with z = 2.979, is the highest redshift source observed in the...
High energy resolution hard X-ray and gamma-ray imagers using CdTe diode devices (2008)
Watanabe, Shin, Ishikawa, Shin-nosuke, Aono, Hiroyuki, Takeda, Shin'ichiro, Odaka, Hirokazu, Kokubun, Motohide, ...
We developed CdTe double-sided strip detectors (DSDs or cross strip detectors) and evaluated their spectral and imaging performance for hard X-rays and gamma-rays. Though the double-sided strip...
Ando, Masaki, Kawamura, Seiji, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, ...
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) which is a future space gravitational wave antenna. DECIGO is expected...
The Japanese space gravitational wave antenna; DECIGO (2008)
Kawamura, Seiji, Ando, Masaki, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, ...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. DECIGO is expected to open a new window of observation for gravitational...
Study of Nonthermal Emission from SNR RX J1713.7-3946 with Suzaku (2008)
Tanaka, Takaaki, Uchiyama, Yasunobu, Aharonian, Felix A., Takahashi, Tadayuki, Bamba, Aya, Hiraga, Junko S., ...
We present results obtained from a series of observations of the supernova remnant RX J1713.7-3946 by the Suzaku satellite. The observations cover about two-thirds of the remnant surface. We...
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...
The XEUS focal plane instruments (2008)
Strüder, Lothar, Barret, Didier, Bellazzini, Ronaldo, Duband, Lionel, Martin, Didier, ...
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...
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...
PoGOLite - A High Sensitivity Balloon-Borne Soft Gamma-ray Polarimeter (2007)
Kamae, Tuneyoshi, Andersson, Viktor, Arimoto, Makoto, Axelsson, Magnus, Bettolo, Cecilia Marini, Björnsson, Claes-Ingvar, ...
We describe a new balloon-borne instrument (PoGOLite) capable of detecting 10% polarisation from 200mCrab point-like sources between 25 and 80keV in one 6 hour flight. Polarisation measurements in...
Yonetoku, Daisuke, Tanabe, Sachiko, Murakami, Toshio, Emura, Naomi, Aoyama, Yuka, Kidamura, Takashi, ...
We observed an X-ray afterglow of GRB 060904A with the Swift and Suzaku satellites. We found rapid spectral softening during both the prompt tail phase and the decline phase of an X-ray flare in the...
Takahashi, Tadayuki, Tanaka, Takaaki, Uchiyama, Yasunobu, Hiraga, Junko S., Nakazawa, Kazuhiro, Watanabe, Shin, ...
We report on results from Suzaku broadband X-ray observations of the southwest part of the Galactic supernova remnant (SNR) RX J1713.7-3946 with an energy coverage of 0.4-40 keV. The X-ray spectrum,...
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...
Suzaku wide-band observations of SN 1006 (2007)
Bamba, Aya, Fukazawa, Yasushi, Hiraga, Junko S., Hughes, John P., Katagiri, Hideaki, Kokubun, Motohide, ...
We report on the wide band spectra of SN 1006 as observed by Suzaku. Thermal and nonthermal emission are successfully resolved thanks to the excellent spectral response of Suzaku's X-ray CCD XIS. The...
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...
Revealing the high energy emission from the obscured Seyfert galaxy MCG−5–23–16 with Suzaku (2007)
Reeves, James N., Awaki, Hisamitsu, Dewangan, Gulab C., Fabian, Andy C., Fukazawa, Yasushi, Gallo, Luigi, ...
The X-ray observatory Suzaku (2007)
Mitsuda, Kazuhisa, Bautz, Mark, Inoue, Hajime, Kelley, Richard L., Koyama, Katsuji, Kunieda, Hideyo, ...
Probing the disk-jet connection of the radio galaxy 3C 120 observed with Suzaku (2007)
Kataoka, Jun, Reeves, James N., Iwasawa, Kazushi, Markowitz, Alex G., Mushotzky, Richard F., Arimoto, Makoto, ...
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, ...
The long Suzaku observation of MCG-6-30-15 (2007)
Miniutti, Giovanni, Fabian, Andrew C., Crummy, Jamie, Larsson, Josefin, Anabuki, Naohisa, Fukazawa, Yasushi, ...
Probing the Disk-jet Connection of the Radio Galaxy 3C120 Observed with Suzaku (2006)
Kataoka, Jun, Reeves, James N., Iwasawa, Kazushi, Markowitz, Alex G., Mushotzky, Richard F., Arimoto, Makoto, ...
Broad line radio galaxies (BLRGs) are a rare type of radio-loud AGN, in which the broad optical permitted emission lines have been detected in addition to the extended jet emission. Here we report on...
A Suzaku Observation of the Low-Ionization Fe-Line Emission from RCW 86 (2006)
Ueno, Masaru, Sato, Rie, Kataoka, Jun, Bamba, Aya, Harrus, Ilana, Hiraga, Junko, ...
The newly operational X-ray satellite Suzaku observed the southwestern quadrant of the supernova remnant (SNR) RCW 86 in February 2006 to study the nature of the 6.4 keV emission line first detected...
Revealing the High Energy Emission from the Obscured Seyfert Galaxy MCG -5-23-16 with Suzaku (2006)
Reeves, James N., Awaki, Hisamitsu, Dewangan, Gulab C., Fabian, Andy C., Fukazawa, Yasushi, Gallo, Luigi, ...
We report on a 100 ks Suzaku observation of the bright, nearby (z=0.008486) Seyfert 1.9 galaxy MCG -5-23-16. The broad-band (0.4-100 keV) X-ray spectrum allows us to determine the nature of the high...
Yaqoob, Tahir, Murphy, Kendrah D., Griffiths, Richard E., Haba, Yoshito, Inoue, Hajime, Itoh, Takeshi, ...
We present detailed time-averaged X-ray spectroscopy in the 0.5--10 keV band of the Seyfert~1.9 galaxy NGC 2992 with the Suzaku X-ray Imaging Spectrometers (XIS). We model the complex continuum in...
Miniutti, Giovanni, Fabian, Andrew C., Anabuki, Naohisa, Crummy, Jamie, Fukazawa, Yasushi, Gallo, Luigi, ...
Suzaku has, for the first time, enabled the hard X-ray variability of the Seyfert 1 galaxy MCG-6-30-15 to be measured. The variability in the 14-45 keV band, which is dominated by a strong reflection...
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...
X-ray Spectral Study of the Photoionized Stellar Wind in Vela~X-1 (2006)
Watanabe, Shin, Sako, Masao, Ishida, Manabu, Ishisaki, Yoshitaka, Kahn, Steven M., Kohmura, Takayoshi, ...
We present results from quantitative modeling and spectral analysis of the high mass X-ray binary Vela X-1 obtained with the Chandra HETGS. The spectra exhibit emission lines from H-like and He-like...
Shedding new light on the 3C 273 jet with the Spitzer Space Telescope (2006)
Uchiyama, Yasunobu, Urry, C. Megan, Cheung, C. C., Jester, Sebastian, Van Duyne, Jeffrey, Coppi, Paolo, ...
We have performed infrared imaging of the jet of the quasar 3C 273 at wavelengths of 3.6 and 5.8 mum with the Infrared Array Camera (IRAC) on the Spitzer Space Telescope. When combined with the...
Results of a Si/CdTe Compton Telescope (2005)
Oonuki, Kousuke, Tanaka, Takaaki, Watanabe, Shin, Takeda, Shin'ichiro, Nakazawa, Kazuhiro, Mitani, Takefumi, ...
We have been developing a semiconductor Compton telescope to explore the universe in the energy band from several tens of keV to a few MeV. We use a Si strip and CdTe pixel detector for the Compton...
Hiraga, Junko S., Uchiyama, Yasunobu, Takahashi, Tadayuki, Aharonian, Felix A.
We present the results of our morphological and spectral study of properties of the supernova remnant RX J1713.7-3946 based on data obtained with XMM-Newton. Highly inhomogeneous structures, such as...
A Prototype Si/CdTe Compton Camera and the Polarization Measurement (2004)
Mitani, Takefumi, Tanaka, Takaaki, Nakazawa, Kazuhiro, Takahashi, Tadayuki, Takashima, Takeshi, Tajima, Hiroyasu, ...
A Compton camera is the most promising approach for gamma-ray detection in the energy region from several hundred keV to MeV, especially for application in high energy astrophysics. In order to...
Development of a Si/CdTe semiconductor Compton telescope (2004)
Tanaka, Takaaki, Mitani, Takefumi, Watanabe, Shin, Nakazawa, Kazuhiro, Oonuki, Kousuke, Sato, Goro, ...
We are developing a Compton telescope based on high resolution Si and CdTe imaging devices in order to obtain a high sensitivity astrophysical observation in sub-MeV gamma-ray region. In this paper,...
Hiraga, Junko S., Uchiyama, Yasunobu, Takahashi, Tadayuki, Aharonian, Felix A.
We present the results of our morphological and spectral study of properties of the supernova remnant RX J1713.7-3946 based on data obtained with XMM-Newton. Highly inhomogeneous structures, such as...
Gamma-ray Polarimetry with Compton Telescope (2004)
Tajima, Hiroyasu, Madejski, Grzegorz, Mitani, Takefumi, Tanaka, Takaaki, Nakamura, Hidehito, Nakazawa, Kazuhiro, ...
Compton telescope is a promising technology to achieve very high sensitivity in the soft gamma-ray band (0.1-10 MeV) by utilizing Compton kinematics. Compton kinematics also enables polarization...
Fischer, Peter, Krimmel, Sven, Krueger, Hans, Lindner, Markus, Loecker, Mario, Nakazawa, Kazuhiro, ...
Multichip modules (MCM) with 4 single photon counting MPEC 2.3 chips bump bonded to 1.3 cm x 1.3 cm large CdTe and Si semiconductor sensors as well as to single chip pixel detectors have been...
Evolution of the Synchrotron Spectrum in Mrk421 during the 1998 Campaign (2003)
Tanihata, Chiharu, Takahashi, Tadayuki, Kataoka, Jun, Madejski, Greg M.
The uninterrupted 7-day ASCA observations of the TeV blazar Mrk421 in 1998 have clearly revealed that X-ray flares occur repeatedly. In this paper, we present the results of the time-resolved...
Watanabe, Shin, Sako, Masao, Ishida, Manabu, Ishisaki, Yoshitaka, Kahn, Steve M., Kohmura, Takayoshi, ...
We report the detection of a fully-resolved, Compton-scattered emission line in the X-ray spectrum of the massive binary GX 301-2 obtained with the High Energy Transmission Grating Spectrometer...
Akiyama, Masayuki, Ueda, Yoshihiro, Ohta, Kouji, Takahashi, Tadayuki, Yamada, Toru
We present the results of optical spectroscopic identifications of a bright subsample of 2-10keV hard X-ray selected sources from the ASCA Medium Sensitivity Survey in the northern sky. The flux...
Tanihata, Chiharu, Takahashi, Tadayuki, Kataoka, Jun, Madejski, Greg M.
The recent long look X-ray observations of TeV blazars have revealed many important new features concerning their time variability. In this paper, we suggest a physical interpretation for those...
Chandra Observations and Optical Identification of Hard X-ray Sources Discovered with ASCA (2002)
Watanabe, Shin, Akiyama, Masayuki, Ueda, Yoshihiro, Ohta, Kouji, Mushotzky, Richard, Takahashi, Tadayuki, ...
We present the first results of the Chandra and optical follow-up observations of hard X-ray sources detected in the ASCA Medium Sensitivity Survey (AMSS). Optical identifications are made for five...
RXTE Observations of 3C273 between 1996 and 2000:Variability Timescale and Jet Power (2002)
Kataoka, Jun, Tanihata, Chiharu, Kawai, Nobuyuki, Takahara, Fumio, Takahashi, Tadayuki, Edwards, Philip G., ...
We present the results of a long-look monitoring of 3C273 with RXTE between 1996 and 2000. A total of 230 observations amounts to a net exposure of 845ksec, with this spectral and variability...
Uchiyama, Yasunobu, Takahashi, Tadayuki, Aharonian, Felix, Mattox, John
We perform X-ray studies of the shell-type supernova remnant (SNR) gamma-Cygni associated with the brightest EGRET unidentified source 3EG J2020+4017. In addition to the thermal emissions with...
Tanihata, Chiharu, Urry, C. Megan, Takahashi, Tadayuki, Kataoka, Jun, Wagner, Stefan J., Madejski, Greg M., ...
Three uninterrupted, long (lasting respectively 7, 10, and 10 days) ASCA observations of the well-studied TeV-bright blazars Mrk 421, Mrk 501 and PKS 2155-304 all show continuous strong X-ray...
Kataoka, Jun, Takahashi, Tadayuki, Wagner, Stefan J., Iyomoto, Naoko, Edwards, Philip G., Hayashida, Kiyoshi, ...
We have studied the rapid X-ray variability of three extragalactic TeV gamma-ray sources; Mrk 421, Mrk 501 and PKS 2155-304. Analyzing the X-ray light curves obtained from ASCA and/or RXTE...
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...
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...
X-ray Observations of TeV Blazars and Multi-Frequency Analysis (1999)
Takahashi, Tadayuki, Madejski, Greg, Kubo, Hidetoshi
The non-thermal spectra of blazars, observed from radio to GeV/TeV gamma-rays, reveal two pronounced components, both produced by radiation by energetic particles. One peaks in the IR - to soft X-ray...
The hardest X-ray source in the ASCA Large Sky Survey: Discovery of a new type 2 Seyfert (1998)
Sakano, Masaaki, Koyama, Katsuji, Tsuru, Takeshi, Awaki, Hisamitsu, Ueda, Yoshihiro, Takahashi, Tadayuki, ...
We present results of ASCA deep exposure observations of the hardest X-ray source discovered in the ASCA Large Sky Survey (LSS) project, designated as AX J131501+3141. We extract its accurate X-ray...
Hiraga,Junko S., Uchiyama,Yasunobu, Takahashi,Tadayuki, Aharonian,Felix A.
We present the results of our morphological and spectral study of properties of the supernova remnant RX J1713.7-3946 based on data obtained with XMM-Newton. Highly inhomogeneous structures, such as...