PRIMUS: GALAXY CLUSTERING AS A FUNCTION OF LUMINOSITY AND COLOR AT 0.2 <z< 1

Ramin A. Skibba,M. Stephen M. Smith,Alison L. Coil,John Moustakas,James Aird,Michael R. Blanton,Aaron D. Bray,Richard Jacob Cool,Daniel J. Eisenstein,Alexander J. Mendez,Kenneth C. Wong,Guangtun Zhu

PRIMUS: GALAXY CLUSTERING AS A FUNCTION OF LUMINOSITY AND COLOR AT 0.2 <z< 1

2014

We present measurements of the luminosity and color-dependence of galaxy clustering at 0.2 luminosity and redder color, with relatively small errors over large volumes. We find that red galaxies have stronger small-scale (0. 1M pch −1 luminosity and color. We also interpret the color dependence with mock catalogs, and find that the clustering of blue galaxies is nearlyconstantwithcolor,whilereddergalaxieshavestrongerclusteringintheone-halotermduetoahighersatellite galaxy fraction. In addition, we measure the evolution of the clustering strength and bias, and we do not detect statistically significant departures from passive evolution. We argue that the luminosity‐ and color‐environment (or halo mass) relations of galaxies have not significantly evolved since z ∼ 1. Finally, using jackknife subsampling methods, we find that sampling fluctuations are important and that the COSMOS field is generally an outlier, due to having more overdense structures than other fields; we find that “cosmic variance” can be a significant source of uncertainty for high-redshift clustering measurements.

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