Abstract
The pancake collapse of pregalactic clouds under UV background radiation is explored with a one- dimensional sheet model. Here, attention is concentrated on elucidating the basic physics on the thermal evolution of pregalactic clouds exposed to diUuse UV radiation. So, we treat accurately the radiation transfer for the ionizing photons, with solving chemical reactions regarding hydrogen molecules as well as atoms. The self-shielding against UV radiation by Lyman-Werner bands, which regulates the H 2
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