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
11 papers · 2 filters
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…
Broad-Band Spectral Energy Distributions of Active Galactic Nuclei from an Accretion Disk with Advective Coronal Flow
Toshihiro Kawaguchi, Toshiya Shimura, Shin Mineshige
We construct a disk-corona model which accounts for the optical-to-X-ray spectral properties of Seyfert nuclei and QSOs. We study emission spectrum emerging from a vertical disk-co…
Star Formation Efficiency in the Central 1 kpc Region of Early-Type Spiral Galaxies
Akio K. Inoue, Hiroyuki Hirashita, Hideyuki Kamaya
It has been reported recently that there are some early-type spiral (Sa--Sab) galaxies having evident star-forming regions which concentrate in their own central 1-kpc. In such cen…
R-modes of neutron stars with a solid crust
Shijun Yoshida, Umin Lee
We investigate the properties of -mode oscillations of a slowly rotating neutron star with a solid crust, by taking account of the effects of the Coriolis force. For the modal a…
Spectral Energy Distributions of Active Galactic Nuclei from an Accretion Disk with Advective Coronal Flow
T. Kawaguchi, T. Shimura, S. Mineshige
To explain the broad-band spectral energy distributions (SED) of Seyfert nuclei and QSOs, we study the emission spectrum emerging from a vertical disk-corona structure composed of…
Application of the Limit Cycle Model to Star Formation Histories in Spiral Galaxies: Variation among Morphological Types
H. Hirashita, H. Kamaya
We propose a limit-cycle scenario of star formation history for any morphological type of spiral galaxies. It is known observationally that the early-type spiral sample has a wider…
Testing Intermittency of the Galactic Star Formation History along with the Infall Model
T. T. Takeuchi, H. Hirashita
We analyze the star formation history (SFH) of the Galactic disk by using an infall model. Based on the observed SFH of the Galactic disk, we first determine the timescales of the…
Tests of Statistical Methods for Estimating Galaxy Luminosity Function and Applications to the Hubble Deep Field
Tsutomu T. Takeuchi, Kohji Yoshikawa, Takako T. Ishii
We studied the statistical methods for the estimation of the luminosity function (LF) of galaxies. We focused on four nonparametric estimators: estimator, maximum-l…
A Study of the Populations of X-ray Sources in the Small Magellanic Cloud with ASCA
Jun Yokogawa, Kensuke Imanishi, Masahiro Tsujimoto +4
The Advanced Satellite for Cosmology and Astrophysics (ASCA) has made multiple observations of the Small Magellanic Cloud (SMC). X-ray mosaic images in the soft (0.7--2.0 keV) and…
Optical Identification of the ASCA Large Sky Survey
M. Akiyama, K. Ohta, T. Yamada +10
We present results of optical identification of the X-ray sources detected in the ASCA Large Sky Survey. Optical spectroscopic observations were done for 34 X-ray sources which wer…