Galaxy Formation and Evolution - IAP Research Group

Date	Subject	Presented by
15 march 2012	Environmental effects on galaxy properties up to z=1.5: observations versus semi-analytical models The comparison of environmental effects on galaxy properties in observational data and in semi-analytical models can give clues on the physical processes taking place to shape galaxy properties. It helps also in understanding possible biases in the analysis performed with real data, and it can give constraints on galaxy evolution recipes in the models. To address this issue, I use mock galaxy catalogues obtained by applying the semi-analytic prescriptions of De Lucia & Blaizot (2007) to the DM halo merging trees extracted from the Millennium Simulation. I compute the colour-density relation up to z=1.5 in these mocks using the same method as in the VVDS survey (Cucciati et al 2006), and I compare it to the one found in the VVDS. I will show that the VVDS observational strategy does not alter the identification of the real underlying colour-density relation, and I will show the different galaxy evolution in models and in real data.	Olga Cucciati INAF, Osservatorio Astronomico di Trieste