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The contribution of major mergers to galaxy mass assembly along cosmic timeis an important ingredient to the galaxy evolution scenario. We aim to measurethe evolution of the merger rate for both luminosity/mass selected galaxysamples and investigate its dependence with the local environment. We use asample of 10644 spectroscopically observed galaxies from the zCOSMOS redshiftsurvey to identify pairs of galaxies destined to merge, using only pairs forwhich the velocity difference and projected separation of both components witha confirmed spectroscopic redshift indicate a high probability of merging. Wehave identified 263 spectroscopically confirmed pairs with r_p^{max} = 100h^{-1} kpc. We find that the density of mergers depends on luminosity/mass,being higher for fainter/less massive galaxies, while the number of mergers agalaxy will experience does not depends significantly on its intrinsicluminosity but rather on its stellar mass. We find that the pair fraction andmerger rate increase with local galaxy density, a property observed up toredshift z=1. We find that the dependence of the merger rate on the luminosityor mass of galaxies is already present up to redshifts z=1, and that theevolution of the volumetric merger rate of bright (massive) galaxies isrelatively flat with redshift with a mean value of 3*10^{-4} (8*10^{-5}respectively) mergers h^3 Mpc^{-3} Gyr^{-1}. The dependence of the merger ratewith environment indicates that dense environments favors major merger eventsas can be expected from the hierarchical scenario. The environment thereforehas a direct impact in shapping-up the mass function and its evolutiontherefore plays an important role on the mass growth of galaxies along cosmictime.

The zCOSMOS redshift survey : Influence of luminosity, mass and environment on the galaxy merger rate