Program: GN-2010B-Q-73

Massive systems have been widely studied both in the nearby universe and at higher redshifts. The morphology content of galaxy clusters at intermediate redshifts differs significantly from those nearby clusters (Dressler et al. 1997, ApJ, 490, 577). What happened with intermediate-mass clusters at these redshifts? Motivated by the lack of systematical nor deep studies of these systems we propose to observe four clusters in the redshift range of 0.3 to 0.6. We ask for telescope time to obtain deep photometry of these systems in the g', r' and i' bands using GMOS with Gemini North. We believe the morphological changes are the most conspicuous in these intermediate-mass clusters and they would allow us to understand the galaxy evolution within the hierarquical model frame.