SIMBAD references

We explore connections between brightest cluster galaxies (BCGs) and their host clusters. We first construct a HeCS-omnibus cluster sample including 227 galaxy clusters within 0.02 < z < 0.30; the total number of spectroscopic members from MMT/Hectospec and SDSS observations is 52325. Taking advantage of the large spectroscopic sample, we compute physical properties of the clusters including the dynamical mass and cluster velocity dispersion (σ_cl). We also measure the central stellar velocity dispersion of the BCGs (σ_* ,BCGs_) to examine the relation between BCG velocity dispersion and cluster velocity dispersion for the first time. The observed relation between BCG velocity dispersion and the cluster velocity dispersion is remarkably tight. Interestingly, the σ_* ,BCG_/σcl_ ratio decreases as a function of σ_cl unlike the prediction from the numerical simulation of Dolag et al. The trend in σ_* ,BCG_/σcl_ suggests that BCG formation is more efficient in lower mass halos.