Red Galaxies Growing in Dark Matter Halos

To understand the slow growth of massive galaxies at z < 1, we have modeled how these galaxies populate dark matter halos. The models are constrained with the observed luminosity function and clustering of z < 1 red galaxies. In the most massive halos, much of the stellar mass resides within multiple satellite galaxies rather than a single central galaxy. Consequently, massive galaxies grow slowly within rapidly growing dark matter halos.