Mathematics – Logic
Scientific paper
Mar 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000pabei..18...83z&link_type=abstract
Prog. Astron., Vol. 18, No. 1, p. 83 - 87
Mathematics
Logic
Galaxy Formation: Cosmology, Galaxy Evolution: Models
Scientific paper
The popular semi-analytic models for galaxy formation and evolution under the hierarchical scenario are discussed, 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 those of the halo spin parameter, of the adopted range for the circular velocity and of the relation between disk size and its mother halo's virial and/or cooling radius, do not have significant influences. Merger between galaxies should be dominant and responsible to the deviation of the theoretical results from observed ones at intermediate redshift, which implies that most of spherical objects should form between redshift 0.5 and 1.5 with the age of some 8 Gyr that is cosmology dependent. Furthermore, the predicted cosmic evolution of the cold gas component is fairly consistent with observations. Finally, the constraint of cosmological parameters are suggested, which is consistent with those obtained from other methods.
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