A Comparative Study of Density Field Estimation for Galaxies: New Insights into the Evolution of Galaxies with Environment in COSMOS out to z~3
arXiv:1503.07879 · doi:10.1088/0004-637X/805/2/121
Abstract
It is well-known that galaxy environment has a fundamental effect in shaping its properties. We study the environmental effects on galaxy evolution, with an emphasis on the environment defined as the local number density of galaxies. The density field is estimated with different estimators (weighted adaptive kernel smoothing, 10 and 5 nearest neighbors, Voronoi and Delaunay tessellation) for a K24 sample of 190,000 galaxies in the COSMOS field at 0.1z3.1. The performance of each estimator is evaluated with extensive simulations. We show that overall, there is a good agreement between the estimated density fields using different methods over 2 dex in overdensity values. However, our simulations show that adaptive kernel and Voronoi tessellation outperform other methods. Using the Voronoi tessellation method, we assign surface densities to a mass complete sample of quiescent and star-forming galaxies out to z3. We show that at a fixed stellar mass, the median color of quiescent galaxies does not depend on their host environment out to z3. We find that the number and stellar mass density of massive (10M) star-forming galaxies have not significantly changed since z3, regardless of their environment. However, for massive quiescent systems at lower redshifts (z1.3), we find a significant evolution in the number and stellar mass densities in denser environments compared to lower density regions. Our results suggest that the relation between stellar mass and local density is more fundamental than the color-density relation and that environment plays a significant role in quenching star formation activity in galaxies at z1.
arXiv comment20 pages, 11 figures, main figures 4,5,8 and 10
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