The Evolution of Galaxies on the Red Sequence and Blue Cloud in BOSS

Hong Guo
(Case Western Reserve Univ)


We analyze the evolution of the BOSS galaxies, especially the CMASS(constant mass) sample from redshift 0.4 to 0.7. We utilize the galaxy two-point correlation function as the main method to study the evolution of red and blue galaxies. The analysis focuses on the small scales(from 0.01 Mpc/h to 20Mpc/h), where the influence of fiber collision effect in the survey is corrected appropriately. We also investigate the clustering dependence on the different color and luminosity, and found consistent results with early works using SDSS DR7 data. While luminous red galaxies have the largest bias relative to the underlying dark matter field, its evolution however is not completely passive from redshift 0.4 to 0.7. We found strong evolution of red galaxies with redshift larger than 0.5. We will incorporate halo occupation distribution to study the evolution of central and satellite galaxies in order to determine the effect of merging in the CMASS sample.