287 citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP65 papers
- Kyoto UniversityJP56 papers
- National Astronomical Observatory of JapanJP28 papers
- Japan Science and Technology AgencyJP16 papers
- Tohoku UniversityJP16 papers
- Kyushu UniversityJP13 papers
- Institute of Space and Astronautical ScienceJP12 papers
- Nagoya UniversityJP11 papers
- Centre National de la Recherche ScientifiqueFR8 papers
- Pennsylvania State UniversityUS8 papers
- The University of OsakaJP7 papers
- University of California, BerkeleyUS7 papers
13 papers · 1 filter
Caustic Crossing Microlensing Event by Binary MACHOs and Time Scale Bias
Mareki Honma
Caustic crossing microlensing events provide us a unique opportunity to measure the relative proper motion of the lens to the source, and so those caused by binary MACHOs are of gr…
Global Law for Dust-to-gas Ratio of Spiral Galaxies
H. Hirashita
Using a one-zone model for the evolution of dust in spiral galaxies and applying the instantaneous recycling approximation to the model equations, we investigate dust-to-gas ratio…
Photometric Properties of Kiso Ultraviolet-Excess Galaxies in the Lynx-Ursa Major Region
Tsutomu T. Takeuchi, Akihiko Tomita, Kouichiro Nakanishi +3
We have performed a systematic study of several regions in the sky where the number of galaxies exhibiting star formation (SF) activity is greater than average. We used Kiso ultrav…
Can precessing jets explain the light curves of Gamma-ray Bursts?
Simon Portegies Zwart, Chang-Hwan Lee, Hyun Kyu Lee
We present a phenomenological model to explain the light curves of gamma-ray bursts. In the model a black hole is orbited by a precessing accretion disc which is fed by a neutron s…
Physical Interpretation of the Mass-Luminosity Relation of Dwarf Spheroidal Galaxies
H. Hirashita, T. T. Takeuchi, N. Tamura
We discuss a physical interpretation of the relation between and of dwarf spheroidal galaxies (dSphs), where and are the virial mass…
Declining Rotation Curve and Brown Dwarf MACHOs
Mareki Honma, Yukitoshi Kan-ya
If the Galactic rotation speed at the Solar circle is km s or smaller, which is supported by several recent studies, the rotation curve of the Galaxy could be dec…
Evolution of the Power Spectrum and the Self-Similarity in the Expanding One-Dimensional Universe
Taihei Yano, Naoteru Gouda
We have investigated time evolutions of power spectra of density fluctuations for long time after the first appearance of caustics in the expanding one-dimensional universe. It is…
The disruption of globular star clusters in the galaxy: A comparative analysis between Fokker-Planck and N-body models
Koji Takahashi, Simon Portegies Zwart
Recent N-body simulations have shown that there is a serious discrepancy between the results of the N-body simulations and the results of Fokker-Planck simulations for the evolutio…
Constraints on leptophobic Z' models from electroweak experiments
Yoshiaki Umeda, Gi-Chol Cho, Kaoru Hagiwara
We study the constraints from updated electroweak data on the three leptophobic Z' models, the model with an appropriate kinetic mixing, a Z' model motivated by…
An X-Ray Microlensing Test of AU-Scale Accretion Disk Structure in Q2237+0305
Atsunori Yonehara, Shin Mineshige, Tadahiro Manmoto +3
The innermost regions of quasars can be resolved by a gravitational-lens {\lq}telescope{\rq} on scales down to a few AU. For the purpose, X-ray observations are most preferable, be…
The hardest X-ray source in the ASCA Large Sky Survey: Discovery of a new type 2 Seyfert
Masaaki Sakano, Katsuji Koyama, Takeshi Tsuru +6
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 i…
Gamma-ray binaries: stable mass transfer from neutron star to black hole
Simon Portegies Zwart
Gamma-ray bursts are characterized by a duration of milliseconds to several minutes in which an enormous amount of radiation is emitted. The origin of these phenomena is still unkn…
Optical Identification of the Hardest X-ray Source in the ASCA Large Sky Survey
M. Akiyama, K. Ohta, T. Yamada +9
We report the optical identification of the hardest X-ray source (AX J131501+3141) detected in an unbiased wide-area survey in the 0.5--10 keV band, the ASCA Large Sky Survey. The…