研究成果・発表論文

Angular Momentum Transport in Early-formed Objects by Cosmic Background Radiation: Radiation-hydrodynamical Approach

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Tsuribe, Tohru,   Umemura, Masayuki

The effects of radiation force by the cosmic background radiation (CBR) on early-formed objects shortly after the cosmological recombination are explored. In particular, we are interested in the angular momentum transport in massive disks that origin...

Self-Similar Viscous Collapse of a Self-Gravitating, Polytropic Gas Disk

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Mineshige, Shin,   Nakayama, Kunji,   Umemura, Masayuki

Self-similar solutions for the time evolution of polytropic, self- gravitating viscous disks is found on the condition that the kinematic viscosity is nu åisebox-0.5ex~ r(\l\ and the gas pressure is P \i̊sebox-0.5ex~ rho (Gamma ) , where l and Gamma ...

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Angular Momentum Transport in Early-formed Objects by Cosmic Background Radiation: Radiation-hydrodynamical Approach

Tsuribe, Tohru,   Umemura, Masayuki

The effects of radiation force by the cosmic background radiation (CBR) on early-formed objects shortly after the cosmological recombination are explored. In particular, we are interested in the angular momentum transport in massive disks that origin...

平成9年 9月   The Astrophysical Journal
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Self-Similar Viscous Collapse of a Self-Gravitating, Polytropic Gas Disk

Mineshige, Shin,   Nakayama, Kunji,   Umemura, Masayuki

Self-similar solutions for the time evolution of polytropic, self- gravitating viscous disks is found on the condition that the kinematic viscosity is nu åisebox-0.5ex~ r(\l\ and the gas pressure is P \i̊sebox-0.5ex~ rho (Gamma ) , where l and Gamma ...

平成9年 8月   Publications of the Astronomical Society of Japan
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Very Strong Microlensing of Distant Luminous Stars by Relic Massive Black Holes

Turner, Edwin L.,   Umemura, Masayuki

We examine the possibility that a population of relic massive black holes, perhaps constituting an important component of the dark matter, might be indirectly detected via their occasional very strong gravitational lensing of individual luminous star...

平成9年 7月   The Astrophysical Journal
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Self-similar Collapse of a Self-gravitating Viscous Disk

Mineshige, Shin,   Umemura, Masayuki

A self-similar solution for time evolution of isothermal, self- gravitating viscous disks is found under the condition that \ensuremathα' \ensuremath≡ \ensuremathα(H/r) is constant in space (where \ensuremathα is the viscosity parameter and H/r is th...

平成9年 5月   The Astrophysical Journal