Cosmic Star Formation History And The Semi-Analytic Models For Galaxy Formation And Evolution

In this thesis the popular semi-analytic models for galaxy formation and evolution under the hierarchical scenario are discussed in detail, based on the most recently observed cosmic star formation history. The standard treatment as well as individual departures are studied. The results can be described as follows. There seems to be no challenge to the present theories of galaxy formation and evolution. Departures of the density profile of halo, SN feedback process and metallicity are important in the modeled calculations. But the departures of the halo spin parameter, of the adopting range for the circular velocity and of the relation between disk size and its mother halo virial and/or cooling radius, do not have significant influences. The results of the cosmic star formation rate densities derived with different parameters of the hierarchical galaxy formation lid evolution models can match the observational data well at both high and low redshift. No matter what parameters are taken, the theoretical results could not match the observed ones at intermediate redshift due to the galaxy interaction (merge) not being considered. It seems that merger between galaxies is responsible to it. It implies that the most spherical objects should form between redshift 0.5 and 1.5 with the age of some 8Gyr, which is cosmology dependent. Furthermore, the predicted cosmic evolution of the cold gas component is fairly consistent with observations. Finally, the constraint of both cosmological parameters and the preferred ranges are suggested, which is consistent with those obtained from other methods.