Abstract
Thermal evolution and formation of H2 molecules in hot pre-galactic gas processed by fast shock waves are investigated both in ‘pancake’ and hydrodynamical scenarios of galaxy formation. It is pointed out that an essential feature of thermodynamics of shocked gas is inequality of temperatures of electrons and heavy particles (atoms and ions): for wide range of conditions electrons are more cold than atoms. Particularly, it makes difficult collisional ionization of matter and provides predominantly neutral flow of gas behind shock front with shock velocityD<500 km s−1. As a consequence, the major part of thermal energy of shocked gas is radiated in Lα line. It allows to made an assumption that bright high-redshifted Lα cloud near radiosource 3C 326.1 is a region of colliding high-velocity gaseous streams.
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