The Role of Shock Heating in the Evolution of Massive Primordial Clouds

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概要

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• The role of shock waves in the evolution of massive primordial gas clouds is investigated. The increase of the ionization degree in the cloud due to the shock heating, and subsequent non-equilibrium cooling causes the formation of hydrogen molecules, which are the most important coolant in the metal-free gas. In this chapter we review the effect of shock waves with various Mach numbers and pre-shock densities in detail and discuss how they affect the following evolution of the parent cloud. By comparison of various timescales, we show that the chemical evolution and the thermal evolution of the primordial gas are quite simple,in spite of the fact that the system as a whole undergoes non-equilibrium evolution. This result, which is demonstrated in a simple diagram (the "shock diagram"), greatly helps us to interpret and predict the thermal evolution of the primordial gas clouds. Finally, we consider the fragmentation process itself, and we investigate the possibility that the cooling instability can create much smaller cloudlets than can be formed through the Jeans instability.

• 理論物理学刊行会の論文
• 2003-02-28

著者

• Yamada Masako

  Department of Exercise Science and Physiology, School of Health Sciences, Prefectural University of

• Yamada Masako

  Department Of Earth And Space Science Osaka University

• YAMADA Masako

  Department of Earth and Space Science, Osaka University

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