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Abstract A two-step process of galaxy formation is presented. As objects generated first, we consider quasars (QSOs) formed at the cosmological redshift z = 4–10. The cooled shells at the shock fronts generated by QSO explosions are split into galaxies of the mass 1010–11 M⊙. Clusters of galaxies are formed at the collision of the cold shells, suggesting the large-scale shell-like or chain-like distributions of galaxies. We can explain the masses, sizes, and space densities of galaxies and clusters of galaxies.
Satoru Ikeuchi (Mon,) studied this question.