117 citations · 539 across the 18 of their papers we have counts for
18 papers
A Technique for Estimating the Absolute Gain of a Photomultiplier Tube
M. Takahashi, Y. Inome, S. Yoshii +26
Detection of low-intensity light relies on the conversion of photons to photoelectrons, which are then multiplied and detected as an electrical signal. To measure the actual intens…
A Hard-to-Soft State Transition of Aquila X-1 Observed with Suzaku
Ko Ono, Kazuo Makishima, Soki Sakurai +3
The recurrent soft X-ray transient Aquila X-1 was observed with Suzaku for a gross duration of 79.9 ks, on 2011 October 21 when the object was in a rising phase of an outburst. Dur…
Suzaku Observation of the High-Inclination Binary EXO 0748-676 in the Hard State
Zhongli Zhang, Soki Sakurai, Kazuo Makishima +4
Utilizing an archived Suzaku data acquired on 2007 December 25 for 46 ks, X-ray spectroscopic properties of the dipping and eclipsing low-mass X-ray binary EXO 0748676 were stud…
A Suzaku Observation of the Low-Mass X-Ray Binary GS 1826-238 in the Hard State
K. Ono, S. Sakurai, Z. Zhang +2
The neutron star Low-Mass X-ray Binary GS 1826-238 was observed with Suzaku on 2009 October 21, for a total exposure of 103 ksec. Except for the type I bursts, the source intensity…
ASTRO-H White Paper - Low-mass X-ray Binaries
C. Done, M. Tsujimoto, E. Cackett +20
There is still 10-20% uncertainty on the neutron star (NS) mass-radius relation. These uncertainties could be reduced by an order of magnitude through an unambiguous measure of M/R…
Probing the Accretion Scheme of the Dipping X-ray Binary 4U 1915-05 with Suzaku
Zhongli Zhang, Kazuo Makishima, Soki Sakurai +2
The dipping low-mass X-ray binary 4U 1915-05 was observed by Suzaku on 2007 November 8 for a net exposure of 39 ksec. It was detected by the XIS with a 0.8-10 keV signal rate of 9.…
Suzaku Studies of the Central Engine in the Typical Type I Seyfert NGC 3227: Detection of Multiple Primary X-ray Continua with Distinct Properties
Hirofumi Noda, Kazuo Makishima, Shin'ya Yamada +3
The type I Seyfert galaxy NGC 3227 was observed by Suzaku six times in 2008, with intervals of week and net exposures of ksec each. Among the six observations, the…
Possible Evidence for Free Precession of a Strongly Magnetized Neutron Star in the Magnetar 4U 0142+61
Kazuo Makishima, Teruaki Enoto, Junko S. Hiraga +5
Magnetars are a special type of neutron stars, considered to have extreme dipole magnetic fields reaching ~1e+11 T. The magnetar 4U 0142+61, one of prototypes of this class, was st…
Suzaku View of the Neutron Star in the Dipping Source 4U 182237
Makoto Sasano, Kazuo Makishima, Soki Sakurai +2
The dipping X-ray source 4U 182237 was observed by Suzaku on 2006 Octrober 20 for a net exposure of 37 ks. The source was detected with the XIS at a 1-10 keV flux of 5.5$\times1…
Suzaku Studies of Luminosity-Dependent Changes in the Low-Mass X-ray Binary Aquila X-1
Soki Sakurai, Shunsuke Torii, Hirofumi Noda +7
The neutron-star Low-Mass X-ray Binary Aquila X-1 was observed by Suzaku for seven times, from 2007 September 28 to October 30. The observations successfully traced an outburst dec…
Evidence for a Cool Disk and Inhomogeneous Coronae from Wide-band Temporal Spectroscopy of Cygnus X-1 with Suzaku
Shin'ya Yamada, Kazuo Makishima, Chris Done +3
Unified X-ray spectral and timing studies of Cygnus X-1 in the low/hard and hard intermediate state were conducted in a model-independent manner, using broadband Suzaku data acquir…
The Nature of the Stable Soft X-ray Emissions in Several Types of Active Galactic Nuclei Observed by Suzaku
Hirofumi Noda, Kazuo Makishima, Kazuhiro Nakazawa +3
To constrain the origin of the soft X-ray excess phenomenon seen in many active galactic nuclei, the intensity-correlated spectral analysis, developed by Noda et al. (2011b) for Ma…
Accretion Geometry of the Low-Mass X-ray Binary Aquila X-1 in the Soft and Hard States
Soki Sakurai, Shin'ya Yamada, Shunsuke Torii +3
The neutron-star Low-Mass X-ray Binary Aquila X-1 was observed seven times in total with the Suzaku X-ray observatory from September 28 to October 30 in 2007, in the decaying phase…
Data-oriented Diagnostics of Pileup Effects on the Suzaku XIS
Shin'ya Yamada, Hideki Uchiyama, Tadayasu Dotani +11
We present the result of a systematic study of pileup phenomena seen in the X-ray Imaging Spectrometer, an X-ray CCD instrument, onboard the Suzaku observatory. Using a data set of…
Suzaku Studies of Wide-Band Spectral Variability of the Bright Type I Seyfert Galaxy Markarian 509
Hirofumi Noda, Kazuo Makishima, Shin'ya Yamada +3
The Type I Seyfert galaxy Markarian 509 was observed with Suzaku in 2010 November, for a gross time span of 2.2 days. Timing and spectral properties of the 0.5-45 keV X-rays, detec…
Improvements in calibration of GSO scintillators in the Suzaku Hard X-ray Detector
Shin'ya Yamada, Kazuo Makishima, Kazuhiro Nakazawa +27
Improvements of in-orbit calibration of GSO scintillators in the Hard X-ray Detector on board Suzaku are reported. To resolve an apparent change of the energy scale of GSO which ap…
RXTE Observations of the Low-Mass X-Ray Binary 4U 1608-522 in Upper-Banana State
Hiromitsu Takahashi, Soki Sakurai, Kazuo Makishima
To investigate the physics of mass accretion onto weakly-magnetized neutron stars, 95 archival RXTE datasets of an atoll source 4U 1608-522, acquired over 1996-2004 in so-called up…
Spectral and Timing Studies of Cyg X-1 in the Low/Hard State with Suzaku
Shunsuke Torii, Shin'ya Yamada, Kazuo Makishima +6
From 2005 to 2009, 25 observations of Cyg X-1 were performed with Suzaku, achieving a total exposure of 446 ks. In all observations, the source was found in the low/hard state, whi…