研究成果・発表論文

Formation of Large-Scale Obscuring Wall and Active Galactic Nucleus Evolution Regulated by Circumnuclear Starbursts

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Ohsuga, Ken,   Umemura, Masayuki

By considering the radiative force by a circumnuclear starburst as well as an active galactic nucleus (AGN), we analyze the equilibrium configuration and the stability of dusty gas in the circumnuclear regions. It is found that the radiative force by...

Radiation Hydrodynamical Mass Accretion onto Galactic Nuclei Driven by Circumnuclear Starbursts

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Ohsuga, Ken,   Umemura, Masayuki,   Fukue, Jun,   Mineshige, Shin

We explore the radiation hydrodynamical evolution of a galactic nuclear gas disk exposed to intense radiation from circumnuclear starbursts. The evolution is characterized by two stages. First, the disk is radially contracted by the radiation force. ...

On the Mass of Population III Stars

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Nakamura, Fumitaka,   Umemura, Masayuki

Performing one-dimensional hydrodynamical calculations coupled with nonequilibrium processes for hydrogen molecule formation, we pursue the thermal and dynamical evolution of filamentary primordial gas clouds and attempt to make an estimate on the ma...

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An X-ray microlensing test of AU-scale quasar disk structure

Yonehara, A.,   Mineshige, S.,   Manmoto, T.,   Fukue, J.,   Umemura, M.,   Turner, E.~L.

The innermostregion of quasars can be resolved by microlensing on scales down to a few AU. For this purpose, X-rays originating from the innermost regions can be selectively amplified by microlensing resulting from the ``caustic crossing'' events, an...

平成12年 1月  
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Formation of Large-Scale Obscuring Wall and Active Galactic Nucleus Evolution Regulated by Circumnuclear Starbursts

Ohsuga, Ken,   Umemura, Masayuki

By considering the radiative force by a circumnuclear starburst as well as an active galactic nucleus (AGN), we analyze the equilibrium configuration and the stability of dusty gas in the circumnuclear regions. It is found that the radiative force by...

平成11年 8月   The Astrophysical Journal Letters
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Radiation Hydrodynamical Mass Accretion onto Galactic Nuclei Driven by Circumnuclear Starbursts

Ohsuga, Ken,   Umemura, Masayuki,   Fukue, Jun,   Mineshige, Shin

We explore the radiation hydrodynamical evolution of a galactic nuclear gas disk exposed to intense radiation from circumnuclear starbursts. The evolution is characterized by two stages. First, the disk is radially contracted by the radiation force. ...

平成11年 6月   Publications of the Astronomical Society of Japan
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On the Mass of Population III Stars

Nakamura, Fumitaka,   Umemura, Masayuki

Performing one-dimensional hydrodynamical calculations coupled with nonequilibrium processes for hydrogen molecule formation, we pursue the thermal and dynamical evolution of filamentary primordial gas clouds and attempt to make an estimate on the ma...

平成11年 4月   The Astrophysical Journal