The clustering of SDSS galaxy groups: mass and color dependence

Understand

We use a sample of galaxy groups selected from the SDSS DR 4 with an adaptive halo-based group finder to probe how the clustering strength of groups depends on their masses and colors.

• In particular, we determine the relative biases of groups of different masses, as well as that of groups with the same mass but with different colors.
• In agreement with previous studies, we find that more massive groups are more strongly clustered, and the inferred mass dependence of the halo bias is in good agreement with predictions for the $\Lambda$CDM cosmology.
• Regarding the color dependence, we find that groups with red centrals are more strongly clustered than groups of the same mass but with blue centrals.