Stellar and dynamical masses of brightest cluster galaxies

摘要

We investigate the stellar and dynamical mass profiles of 32 brightest cluster galaxies (BCGs, M_K = -25.7 to -27.8 mag) in massive clusters (0.05 < z < 0.30), and in particular the rising velocity dispersion profiles of 23 of these BCGs found in Loubser et al. (2018). We make comprehensive measurements of the Gauss-Hermite higher order velocity moments h_3 and h_4, and find positive central values for h_4 for all the BCGs. We model the stellar and dynamical mass profiles of 25 of the BCGs using the Multi-Gaussian Expansion (MGE) and Jeans Anisotropic Method (JAM) for an axisymmetric case, deriving the stellar mass-to-light ratio (Υ_(*DYN)), and anisotropy (β_z). We further explicitly add a dark matter halo mass component (Mdm within r200) which we constrain from weak lensing results. In this proceedings, we summarise the study and show an example of the results.