2009ApJ...697.1369B

Using deep infrared observations conducted with the MOIRCS imager on the Subaru Telescope in the northern GOODS field combined with public surveys in GOODS-S, we investigate the dependence on stellar mass, M_*, and galaxy type of the close pair fraction (5 h.^–1 kpc < r_sep< 20 h.^–1 kpc) and implied merger rate. In terms of combined depth and survey area, our publicly available mass-limited sample represents a significant improvement over earlier infrared surveys used for this purpose. In common with some recent studies, we find that the fraction of paired systems that could result in major mergers is low (∼4%) and does not increase significantly with redshift to z ∼ 1.2, with ∝(1 + z)^1.6±1.6. Our key finding is that massive galaxies with M_*>10¹¹ M_☉ are more likely to host merging companions than less massive systems (M_*∼ 10¹⁰ M_☉). We find evidence for a higher pair fraction for red, spheroidal hosts compared to blue, late-type systems, in line with expectations based on clustering at small scales. The so-called "dry" mergers between early-type galaxies devoid of star formation (SF) represent nearly 50% of close pairs with M_*>3 x 10¹⁰ M_☉ at z ∼ 0.5, but less than 30% at z ∼ 1. This result can be explained by the increasing abundance of red, early-type galaxies at these masses. We compare the volumetric merger rate of galaxies with different masses to mass-dependent trends in galaxy evolution. Our results reaffirm the conclusion of Bundy et al. that major mergers do not fully account for the formation of spheroidal galaxies since z ∼ 1. In terms of mass assembly, major mergers contribute little to galaxy growth below M_*∼ 3x10¹⁰ M_☉ but play a more significant role among galaxies with M_*≳ 10¹¹ M_☉∼ 30% of which have undergone mostly dry mergers over the observed redshift range. Overall, the relatively rapid and recent coalescence of high-mass galaxies mirrors the expected hierarchical growth of halos and is consistent with recent model predictions, even if the top-down suppression of SF and morphological evolution (i.e., "downsizing") involves additional physical processes.