Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP4.5k papers
- Yukawa Institute for Theoretical PhysicsJP2.7k papers
- The University of OsakaJP2.3k papers
- Nagoya UniversityJP2.2k papers
- High Energy Accelerator Research OrganizationJP2.2k papers
- Centre National de la Recherche ScientifiqueFR2.1k papers
- Tokyo Institute of TechnologyJP2k papers
- University of TsukubaJP1.7k papers
- Brookhaven National LaboratoryUS1.6k papers
- Stony Brook UniversityUS1.5k papers
- Waseda UniversityJP1.5k papers
- Commissariat à l'Énergie Atomique et aux Énergies AlternativesFR1.5k papers
100 papers · 2 filters
Photometric Observations of an SU UMa-type Dwarf Nova VW Coronae Borealis during Outbursts
D. Nogami, M. Uemura, R. Ishioka +2
We report the photometric observations of an SU UMa-type dwarf nova VW CrB during two superoutbursts in 2001 and 2003 and a normal outburst in 2003. Superhumps with a period of 0.0…
Coronal Heating and Acceleration of the High/Low-Speed Solar Wind by Fast/Slow MHD Shock Trains
Takeru K. Suzuki
We investigate coronal heating and acceleration of the high- and low-speed solar wind in the open field region by dissipation of fast and slow magnetohydrodynamical (MHD) waves thr…
A Disk Galaxy of Old Stars at z ~ 2.5
Alan Stockton, Gabriela Canalizo, Toshinori Maihara
We describe observations of a galaxy in the field of the radio galaxy 4C 23.56, photometrically selected to have a spectral-energy distribution consistent with an old ste…
Angular Momentum Transport by MHD Turbulence in Accretion Disks: Gas Pressure Dependence of the Saturation Level of the Magnetorotational Instability
Takayoshi Sano, Shu-ichiro Inutsuka, Neal J. Turner +1
The saturation level of the magnetorotational instability (MRI) is investigated using three-dimensional MHD simulations. The shearing box approximation is adopted and the vertical…
A Discovery of a Peculiar Pulsar in the Small Magellanic Cloud
Masaru Ueno, Hiroya Yamaguchi, Shin-ichiro Takagi +2
We report on a peculiar X-ray binary pulsar IKT1 = RXJ0047.3-7312 observed with XMM-Newton in Oct. 2000. The X-ray spectrum is described by a two-component spectrum. The hard compo…
A General Formulation of the Source Confusion Statistics and Application to Infrared Galaxy Surveys
Tsutomu T. Takeuchi, Takako T. Ishii
Source confusion has been a long-standing problem in the astronomical history. In the previous formulation, sources are assumed to be distributed homogeneously on the sky. This fun…
General Relativistic MHD Simulations of the Gravitational Collapse of a Rotating Star with Magnetic Field as a Model of Gamma-Ray Bursts
Yosuke Mizuno, Shoichi Yamada, Shinji Koide +1
We have performed 2.5-dimensional general relativistic magnetohydrodynamic (MHD) simulations of the gravitational collapse of a magnetized rotating massive star as a model of gamma…
Cosmic distance-duality as probe of exotic physics and acceleration
Bruce A. Bassett, Martin Kunz
In cosmology, distances based on standard candles (e.g. supernovae) and standard rulers (e.g. baryon oscillations) agree as long as three conditions are met: (1) photon number is c…
The Infrared Counterpart of the X-Ray Nova XTE J1720-318
Tetsuya Nagata, Daisuke Kato, Daisuke Baba +15
We report on the discovery of an infrared counterpart to the X-ray transient XTE J1720-318 on 2003 January 18, nine days after an X-ray outburst, and the infrared light curve durin…
GRB980425 in the Off-Axis Jet Model of the Standard GRBs
Ryo Yamazaki, Daisuke Yonetoku, Takashi Nakamura
Using a simple off-axis jet model of GRBs, we can reproduce the observed unusual properties of the prompt emission of GRB980425, such as the extremely low isotropic equivalent gamm…
Cosmological X-Ray Flashes from Off-Axis Jets
Ryo Yamazaki, Kunihito Ioka, Takashi Nakamura
The <V/Vmax> of the cosmological X-ray flashes detected by WFC/BeppoSAX is calculated theoretically in a simple jet model. The total emission energy from the jet is assumed to be c…
Constraints On the Diffusive Shock Acceleration From the Nonthermal X-ray Thin Shells In SN1006 NE Rim
Ryo Yamazaki, Tatsuo Yoshida, Toshio Terasawa +2
Characteristic scale lengths of nonthermal X-rays from the SN1006 NE rim, which are observed by Chandra, are interpreted in the context of the diffusive shock acceleration on the a…
WMAP constraints on scalar-tensor cosmology and the variation of the gravitational constant
Ryo Nagata, Takeshi Chiba, Naoshi Sugiyama
We present observational constraints on a scalar-tensor gravity theory by test for CMB anisotropy spectrum. We compare the WMAP temperature power spectrum with the harmonic a…
A Study of the Distribution of Star-Forming Regions in Luminous Infrared Galaxies by Means of H Imaging Observations
T. Hattori, M. Yoshida, H. Ohtani +7
We performed H-alpha imaging observations of 22 luminous infrared galaxies to investigate how the distribution of star-forming regions in these galaxies is related to galaxy intera…
Cosmic acceleration vs axion-photon mixing
Bruce A. Bassett, Martin Kunz
Axion-photon mixing has been proposed as an alternative to acceleration as the explanation for supernovae dimming. We point out that the loss of photons due to this mixing will ind…
Thermal and Non-thermal X-Rays from the LMC Super Bubble 30 Dor C
Aya Bamba, Masaru Ueno, Hiroshi Nakajima +1
We report on the discovery of thermal and non-thermal X-rays from the shells of the super bubble (SB) 30 Dor C in the Large Magellanic Cloud (LMC). The X-ray morphology is a nearly…
Detecting the WIMP-wind via spin-dependent interactions
Toru Tanimori, Hidetoshi Kubo, Kentaro Miuchi +4
Revealing the nature of dark matter is one of the most interesting tasks in astrophysics. Measuring the distribution of recoil angles is said to be one of the most reliable methods…
1993 Superoutburst of LL Andromedae
T. Kato
We present time-resolved CCD photometry of LL And during its 1993 outburst. The observation revealed the presence of superhumps with a period of 0.05697(3) d. This period is one of…
Unusual State in V Sagittae
T. Kato
It has been recently demonstrated that the recurring high/low states in the peculiar binary V Sge can be explained by considering the limit-cycle oscillation involving negative fee…
V1494 Aql: Eclipsing Fast Nova with an Unusual Orbital Light Curve
T. Kato, R. Ishioka, M. Uemura +2
We present time-resolved photometry of V1494 Aql (Nova Aql 1999 No. 2: http://www.kusastro.kyoto-u.ac.jp/vsnet/Novae/v1494aql.html) between 2001 November and 2003 June. The object…
Superhumps and Repetitive Rebrightenings of the WZ Sge-Type Dwarf Nova, EG Cancri
T. Kato, D. Nogami, K. Matsumoto +1
We report on time-resolved photometric observations of the WZ Sge-type dwarf nova, EG Cnc (Huruhata's variable, see also http://www.kusastro.kyoto-u.ac.jp/vsnet/DNe/egcnc.html), du…
A New SU UMa-Type Dwarf Nova, QW Serpentis (= TmzV46)
D. Nogami, M. Uemura, R. Ishioka +11
We report on the results of the QW Ser campaign which has been continued from 2000 to 2003 by the VSNET collaboration team. Four long outbursts and many short ones were caught duri…
Variable Star Network: World Center for Transient Object Astronomy and Variable Stars
T. Kato, M. Uemura, R. Ishioka +4
Variable Star Network (VSNET, http://www.kusastro.kyoto-u.ac.jp/vsnet/) is a global professional-amateur network of researchers in variable stars and related objects, particularly…
Subaru Deep Spectroscopy of the Very Extended Emission-Line Region of NGC 4388: Ram Pressure Stripped Gas Ionized by the Nuclear Radiation
M. Yoshida, Y. Ohyama, M. Iye +17
We report here the results of deep optical spectroscopy of the very extended emission-line region (VEELR) found serendipitously around the Seyfert 2 galaxy NGC 4388 in the Virgo cl…