Oral Presentation

Mass-Velocity Dispersion Relation on MaNGA Brightest Cluster Galaxies

Author(s): Yong Tian (National Central University)

Presenter: Yong Tian (National Central University)

We investigated a kinematic scaling relation between the baryonic mass and the flat velocity dispersion, i.e., mass-velocity dispersion relation (MVDR), from the brightest cluster galaxies (BCGs) to the galaxy clusters. Combining with 54 BCGs in Mapping Nearby Galaxies at Apache Point Observatory (MaNGA) and 29 galaxy clusters in the HIghest X-ray FLUx Galaxy Cluster Sample (HIFLUGCS), we reveal a tight empirical relation on BCG-cluster scales, i.e., log(M_bar/M_Θ)=(4.1±0.1)log(σ_los/kms^-1)+(1.6±0.3), with a tiny lognormal intrinsic scatter of (10⁺²_-1)%. This slope is consistent with the implication of the acceleration relation in galaxy clusters, albeit at a larger characteristic acceleration scale. Additionally, the flat velocity dispersion is present in both BCG and cluster samples. Notably, the MVDR disfavors the general prediction of the slope of three in the dark matter model.