摘要
I investigate the environmental dependence of galaxy colors in the CMASS sample of the Sloan Digital Sky Survey Data Release 9 （SDSS DR9）. To decrease the radial selection effect, I divide the CMASS sample into subsamples with a redshift binning size of △z = 0.01 and analyze the environmental dependence of the u - r, u - g, g - r, r - i and i - z colors for these subsamples in each redshift bin. Statistical analysis shows that all five colors weakly correlate with the local environment, which may mean that the environmental processes responsible for a galaxy＇s properties pro- ceed slowly over cosmic time.
I investigate the environmental dependence of galaxy colors in the CMASS sample of the Sloan Digital Sky Survey Data Release 9 （SDSS DR9）. To decrease the radial selection effect, I divide the CMASS sample into subsamples with a redshift binning size of △z = 0.01 and analyze the environmental dependence of the u - r, u - g, g - r, r - i and i - z colors for these subsamples in each redshift bin. Statistical analysis shows that all five colors weakly correlate with the local environment, which may mean that the environmental processes responsible for a galaxy＇s properties pro- ceed slowly over cosmic time.
基金
Supported by the National Natural Science Foundation of China
