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
65 papers · 1 filter
Optical to Near-IR Spectrum of a Massive Evolved Galaxy at z = 1.26
Y. Matsuoka, B. A. Peterson, S. Oyabu +6
We present the optical to near-infrared (IR) spectrum of the galaxy TSPS J1329-0957, a red and bright member of the class of extremely red objects (EROs) at z = 1.26. This galaxy w…
Molecular Gas Distribution in Barred and Non-Barred Galaxies along the Hubble Sequence
S. Komugi, Y. Sofue, K. Kohno +4
We present results from a survey of 12CO(J=1-0) spectra obtained for the central regions of 68 nearby galaxies at an angular resolution of 16 arcseconds using the Nobeyama Radio Ob…
Pregalactic LiBeB Production by Supernova Cosmic Rays
Motohiko Kusakabe
I calculate the evolution of Be and B abundances produced by cosmic rays generated by massive stars in the pregalactic phase of the universe. The inputs for calculation, i.e. the s…
Emergence of a Helical Flux Rope Under an Active Region Prominence
Takenori J. Okamoto, Saku Tsuneta, Bruce W. Lites +12
Continuous observations were obtained of active region 10953 with the Solar Optical Telescope (SOT) on board the \emph{Hinode} satellite during 2007 April 28 to May 9. A prominence…
Nuclear/Circumnuclear Starbursts and Active Galactic Nuclei Mass Accretion in Seyfert Galaxies
Yasuyuki Watabe, Nozomu Kawakatu, Masatoshi Imanishi
We investigated the correlation between nuclear/circumnuclear starbursts around the active galactic nuclei (AGNs) and the AGN activities for 43 Seyfert galaxies in the CfA and 12 m…
The X^- Solution to the ^6Li and ^7Li Big Bang Nucleosynthesis Problems
Motohiko Kusakabe, Toshitaka Kajino, Richard N. Boyd +2
The Li abundance observed in metal poor halo stars appears to exhibit a plateau as a function of metallicity similar to that for Li, suggesting a big bang origin. However,…
Low-Ionization Emission Regions in Quasars: Gas Properties Probed with Broad O I and Ca II Lines
Y. Matsuoka, K. Kawara, S. Oyabu
We have compiled the emission-line fluxes of O I 8446, O I 11287, and the near-IR Ca II triplet (8579) observed in 11 quasars. These lines are considered to emerge from the same ga…
SDSS J1029+2623: A Gravitationally Lensed Quasar with an Image Separation of 22.5 Arcseconds
Naohisa Inada, Masamune Oguri, Tomoki Morokuma +16
We report the discovery of a cluster-scale lensed quasar, SDSS J1029+2623, selected from the Sloan Digital Sky Survey. The lens system exhibits two lensed images of a quasar at z_s…
Discovery of a Gravitationally Lensed Quasar from the Sloan Digital Sky Survey: SDSS J133222.62+034739.9
Tomoki Morokuma, Naohisa Inada, Masamune Oguri +9
We report the discovery of the two-image gravitationally lensed quasar SDSS J133222.62+034739.9 (SDSS J1332+0347) with an image separation of Delta_theta=1.14". This system consist…
Shock-Wave Heating Model for Chondrule Formation: Prevention of Isotopic Fractionation
Hitoshi Miura, Taishi Nakamoto
Chondrules are considered to have much information on dust particles and processes in the solar nebula. It is naturally expected that protoplanetary disks observed in present star…
New Analytical Formula for Supercritical Accretion Flows
K. Watarai
We examine a new family of global analytic solutions for optically thick accretion disks, which includes the supercritical accretion regime. We found that the ratio of the advectio…
Two evolutional paths of an axisymmetric gravitational instability in the dust layer of a protoplanetary disk
Fumiharu Yamoto, Minoru Sekiya
Nonlinear numerical simulations are performed to investigate the density evolution in the dust layer of a protoplanetary disk due to the gravitational instability and dust settling…
Forecasting Solar Wind Speeds
Takeru K. Suzuki
By explicitly taking into account effects of Alfven waves, I derive from a simple energetics argument a fundamental relation which predicts solar wind (SW) speeds in the vicinity o…
The Largest Blueshifts of [O III] emission line in Two Narrow-Line Quasars
Kentaro Aoki, Toshihiro Kawaguchi, Kouji Ohta
We have obtained optical intermediate resolution spectra (R = 3000) of the narrow-line quasars DMS 0059-0055 and PG 1543+489. The [O III] emission line in DMS 0059-0055 is blueshif…
Growth of massive black holes by super-Eddington accretion
T. Kawaguchi, K. Aoki, K. Ohta +1
Narrow-Line Seyfert 1 galaxies (NLS1s) and Narrow-Line quasars (NLQs) seem to amount to ~ 10-30 % of active galactic nuclei (AGNs) in the local universe. Together with their averag…
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…
Faint 6.7um Galaxies and their Contributions to the Stellar Mass Density in the Universe
Yasunori Sato, Lennox L. Cowie, Kimiaki Kawara +6
We discuss the nature of faint 6.7um galaxies detected with the mid-infrared camera ISOCAM on board the Infrared Space Observatory (ISO). The 23 hour integration on the Hawaii Deep…
The origin of optical emission from super-Eddington accreting Active Galactic Nuclei: the case of Ton S 180
T. Kawaguchi, A. Pierens, J. -M. Hure
Self-gravitating accretion discs have only been studied in a few nearby objects using maser spots at the parsec-scale. We find a new spectral window for observing the self-gravitat…
Sgr A East and its surroundings observed in X-rays
Masaaki Sakano, Robert S. Warwick, Anne Decourchelle
We report the results of an XMM-Newton observation of Sgr A East and its surroundings. The X-ray spectrum of Sgr A East is well represented with a two-temperature plasma model with…
Near-Infrared Colors of Gamma-Ray Burst Afterglows and Cosmic Reionization History
Akio K. Inoue, Ryo Yamazaki, Takashi Nakamura
Using the near-infrared (NIR) observations of the afterglows of the high redshift ($5 \la z \la 25$) gamma-ray bursts (GRBs) which will be detected by the {\it Swift} satellite, we…
A New Method to Map Flares in Quasars
Atsunori Yonehara, Shin Mineshige, Yoh Takei +2
Recently, Chartas et al. (2001) detected a rapid X-ray flare in the gravitationally lensed, multiple image quasar RX J0911.4+0551. Dramatic events, such as rapid X-ray flares, are…
Comptonization in Super-Eddington Accretion Flow and Growth Timescale of Supermassive Black Holes
Toshihiro Kawaguchi
Super-Eddington accretion onto black holes (BHs) may occur at ultraluminous compact X-ray sources in nearby galaxies, Galactic microquasars and narrow-line Seyfert 1 galaxies (NLS1…
The Luminosity Function of IRAS PSCz Galaxies
Tsutomu T. Takeuchi, Kohji Yoshikawa, Takako T. Ishii
We estimated the luminosity function (LF) of IRAS galaxies in the PSCz catalogue. The faint end of the PSCz LF is slightly steeper than that of the LF derived by Saunders et al. (1…
A Bridge from Optical to Infrared Galaxies: Explaining Local Properties, Predicting Galaxy Counts and the Cosmic Background Radiation
Tomonori Totani, Tsutomu T. Takeuchi
We give an explanation for the origin of various properties observed in local infrared galaxies, and make predictions for galaxy counts and cosmic background radiation (CBR), by a…