Star Formation in the Primordial Gas : Overview
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概要
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Recently, the study for the star formation process in the primordial gas progresses very much. We show the outline of the thermal and dynamical evolution of primordial gas cloudsin the universe after decoupling. The thermal process of (he primordial gas is much differentfrom the thermal process of the present-day interstellar gas. Especially, hydrogen moleculeis the most important coolant at the low temperature gas (〜 10^3K). Considering the formation of H_2 and the cooling by H_2 line emission, we can study the thermal evolution of theprimordial gas and investigate the star formation process. We propose the following scenario to form primordial stars efficiently. First, by pancakecollapse of the overdensity regions in the expanding universe, disk like clouds form. A disklike cloud has a tendency to fragment into filamentary clouds. Filamentary clouds are formed and they collapse dynamically. After collapse is almost halted by pressure force, the filament fragments into cloud cores. Finally, a primordial star forms in a cloud core.
- 2003-02-28
著者
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Nishi R
Department Of Physics Niigata University
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Nishi Ryoichi
Department Of Physics Kyoto University
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Nishi Ryoichi
Department of Physics, Niigata University
関連論文
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- Kepler Rotation Effects on the Binary-Lens Microlensing Events
- Evolution of Primordial Protostellar Clouds : Quasi-Static Analysis
- The Fragment Mass Scale of the Primordial Gas Clouds. I : Non-Spherical Pressure-Free Collapse : Astrophysics and Relativity
- Photodissociative Regulation of Star Formation in Metal-Free Pre-Galactic Clouds
- On the Instability of Decelerating Shock Waves : Astrophysics and Relativity
- Dark Matter Search with Gravitational Microlensing Events
- On the Fragment Mass Scale of Primordial Gas Clouds : Effect of Dark Matter Component
- Star Formation in the Primordial Gas : Overview
- Primordial Molecular Emission in Population III Galaxies
- H_2 Line Emission Associated with the Formation of the First Stars
- H2 Line Emission Associated with the Formation of the First Stars
- Microlensing and Halo Models of the Galaxy
- On the Fragment Mass Scale of Primordial Gas Clouds--Effect of Dark Matter Component (Star Formation in the Primordial Gas)
- Back Reaction to the Spectrum of Magnetic Field in the Kinetic Dynamo Theory : Modified Kulsrud-Anderson Equation : Astrophysics and Relativity
- Expected EAGLE Event Rate towards the Magellanic Clouds
- Thermal and Dynamical Evolution of Primordial Gas Clouds : On the Formation of First Luminous Objects
- The Thermal Evolution of the Postshock Layer in Pregalactic Clouds : Astrophysics and Relativity
- Chapter 1 Star Formation in the Primordial Gas : Overview