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
89 papers · 2 filters
An Extremely Red Nucleus in an Absorbed QSO at z=0.65
Masayuki Akiyama, Kouji Ohta
The results of K-band-imaging observations of a candidate of an absorbed QSO at z=0.653, AX J131831+3341, are presented. The B-K color of the object is 4.85 mag, which is much redd…
Deep-Imaging Observations of a Candidate of an Absorbed QSO at z=0.653, AX J131831+3341
M. Akiyama, K. Ohta, N. Tamura +12
The results of deep-imaging observations of a candidate of an absorbed QSO at z=0.653, AX J131831+3341, are presented. AX J131831+3341 was found during the course of optical follow…
Discovery of a 9-s X-Ray Pulsar, AX J0049-732, in the Small Magellanic Cloud
Masaru Ueno, Jun Yokogawa, Kensuke Imanishi +1
We report the ASCA discovery of a new X-ray pulsar, AX J0049-732, in the Small Magellanic Cloud (SMC). The pulse shape is sinusoidal with a barycentric period of 9.1320 +/- 0.0004…
ASCA Discovery of Diffuse 6.4 keV Emission Near the Sgr C Complex: A New X-ray Reflection Nebula
H. Murakami, K. Koyama, M. Tsujimoto +2
We present an ASCA discovery of diffuse hard X-ray emission from the Sgr C complex with its peak in the vicinity of the molecular cloud core. The X-ray spectrum is characterized by…
Evidence for a source size of less than 2000 AU in Quasar 2237+0305
Atsunori Yonehara
Recently, OGLE team have reported clear quasar microlensing signal in Q2237+0305. We have analyzed the microlens event of ``image C'' by using their finely and densely sampled ligh…
Possible direct method to determine the radius of a star from the spectrum of gravitational wave signals II : Spectra for various cases
Motoyuki Saijo, Takashi Nakamura
We compute the spectrum and the waveform of gravitational waves generated by the inspiral of a disk or a spherical like dust body into a Kerr black hole. We investigate the effect…
A comment on trans-Planckian physics in inflationary universe
Takahiro Tanaka
There are several works searching for a clue of trans-Planckian physics on the primordial density perturbation spectrum. Here we would like to point out an important aspect which h…
On the Nature of AX J2049.6+2939 and AX J2050.0+2914
Emi Miyata, Kouji Ohta, Kenichi Torii +4
AX J2049.6+2939 is a compact X-ray source in the vicinity of the southern blow-up region of the Cygnus Loop supernova remnant (Miyata et al. 1998a). This source was the brightest X…
Slim Disk Model for Ultra-Luminous X-Ray Sources
Ken-ya Watarai, Tsunefumi Mizuno, Shin Mineshige
The Ultra Luminous X-ray Sources (ULXs) are unique in exhibiting moderately bright X-ray luminosities, , and relatively high blackbody t…
Fast magnetic reconnection in free space: self-similar evolution process
S. Nitta, S. Tanuma, K. Shibata +1
We present a new model for time evolution of fast magnetic reconnection in free space, which is characterized by self-similarity. Reconnection triggered by locally enhanced resisti…
On the Origin of Faint Intracluster Starlight in Coma
Vladimir Korchagin, Toshio Tsuchiya, Shoken M. Miyama
Using N-body numerical simulations, we examine possible mechanisms for the origin of the intracluster starlight features recently discovered in the Coma cluster of galaxies. We sho…
Discovery of the Slowest X-Ray Pulsar in the SMC, AX J0049.5-7323, with ASCA
Jun Yokogawa, Kensuke Imanishi, Masaru Ueno +1
The discovery of coherent pulsations with ASCA from an X-ray source, AX J0049.5-7323, is reported. The barycentric period was determined to be 755.5 +/- 0.6 s, which is the longest…
Emission from Dust in Galaxies: Metallicity Dependence
H. Hirashita, A. K. Inoue, H. Kamaya +1
Infrared (IR) dust emission from galaxies is frequently used as an indicator of star formation rate (SFR). However, the effect of the dust-to-gas ratio (i.e., amount of the dust) o…
Resistive Magnetohydrodynamics of Jet Formation and Magnetically Driven Accretion
T. Kuwabara, K. Shibata, R. Matsumoto
We carried out 2.5-dimensional resistive magnetohydrodynamic simulations to study the effects of magnetic diffusivity on magnetically driven mass accretion and jet formation. We fo…
Determining the Equation of State of the Expanding Universe Using a New Independent Variable
Takashi Nakamura, Takeshi Chiba
To determine the equation of state of the universe, we propose to use a new independent variable , where and are the present Hubble pa…
Formation of a Massive Black Hole at the Center of the Superbubble in M82
S. Matsushita, R. Kawabe, H. Matsumoto +5
We performed 12CO(1-0), 13CO(1-0), and HCN(1-0) interferometric observations of the central region (about 450 pc in radius) of M82 with the Nobeyama Millimeter Array, and have succ…
Discovery of 101-s Pulsations from AX J0057.4-7325 in the SMC with ASCA
Jun Yokogawa, Ken'ichi Torii, Takayoshi Kohmura +2
The results from two ASCA observations of AX J0057.4-7325 = RX J0057.3-7325 are presented. Coherent pulsations with a barycentric period of 101.45 +/- 0.07 s were discovered in the…
A Local Void and the Accelerating Universe
Kenji Tomita
Corresponding to the recent observational claims that we are in a local void (an underdense region) on scales of 200 - 300 Mpc, the magnitude-redshift relation in a cosmological mo…
Vacuum Selection by Collapsing
Nobuhiro Maekawa
In this talk, we discuss the possibility that the vacuum is dynamically determined in the history of the universe. The point is that some of the bubbles with a certain vacuum shrin…
Discovery of a Luminous, Variable, Off-Center Source in the Nucleus of M82 with the Chandra HRC
H. Matsumoto, T. G. Tsuru, K. Koyama +8
We present results from observations of the most famous starburst galaxy M82 with the High-Resolution Camera onboard the Chandra X-Ray Observatory. We found nine sources in the cen…
Exploring Galaxy Evolution from Infrared Number Counts and Cosmic Infrared Background
Tsutomu T. Takeuchi, Takako T. Ishii, Hiroyuki Hirashita +4
Recently reported infrared (IR) galaxy number counts and cosmic infrared background (CIRB) all suggest that galaxies have experienced a strong evolution sometime in their lifetime.…
Unusual Properties of X-Ray Emission near the Galactic Center
Y. Tanaka, K. Koyama, Y. Maeda +1
The X-ray spectrum in a region of the Galactic center observed with the ASCA satellite is examined in detail, following the first report by Koyama et al.…
Subaru Deep Survey I. Near-Infrared Observations
T. Maihara, F. Iwamuro, H. Tanabe +30
Deep near-infrared images of a blank 2'x2' section of sky near the Galactic north pole taken by Subaru Telescope are presented. The total integration times of the J and K' bands ar…
Structural Model of Molecular Cloud Complexes: Mass, Size, and External Pressure
A. K. Inoue, H. Kamaya
We investigate the structure of the molecular cloud complexes (MCCs) as a group of several giant molecular clouds (GMCs) in the Galaxy. Then, we find that the mass-size relation wh…