Abstract
Assuming that the intergalactic clouds with the mass 107∼1013M⊙ were born at the epoch z=5∼10, their thermal and dynamical evolution is numerically explored. The clouds with tha mass greater than 109M⊙ had collapsed by the present epoch, and their evolution weakly depends upon the mass. We may assign these collapsed clouds to quasars and galaxies. The clouds with the mass smaller than 109M⊙ can keep expansion, and their evolution is characterized as pressure confined clouds. Physical quantities of these expanding clouds well correspond to the Lyman alpha absorbers of QSO lights. Some relevant problems to the present calculations such as the formation of a massive halo and the mass spectrum of intergalactic clouds are discussed briefly.
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