THE CLUSTERING OF GALAXIES IN A HIERARCHICAL UNIVERSE
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Abstract
We introduce a new technique for following the formation and evolution of galaxies in cosmological N-body simulations. Dissipationless simulations a reused totracktheformationandmergingofdarkmatterhalosas afunctionofredshift.Simpleprescriptions, takendirectlyfromsemi-analytic modelsofgalaxyformation,areadoptedforgascooling, star formation, supernovafeedbackandthemergingofgalaxies withinthehalos.This scheme enables us to explore the clustering propertiesofgalaxies as a function of redshiftandtoinvestigate how selection by luminosity, colourortypeinu-encestheresults.Twovariantsofacolddarkmatter (CDM)cosmologyare studied:ahigh-densitymodelwith shape-parameter?=0:21(CDM),and alow-densitymodelwith=0:3and=0:7(CDM)
