# Mass–Velocity Dispersion Relation in HIFLUGCS Galaxy Clusters

@article{Tian2020MassVelocityDR,
title={Mass–Velocity Dispersion Relation in HIFLUGCS Galaxy Clusters},
author={Yong Tian and Po-Chieh Yu and Pengfei Li and Stacy S. McGaugh and Chung-Ming Ko},
journal={The Astrophysical Journal},
year={2020},
volume={910}
}
• Yong Tian
• Published 2 October 2020
• Physics
• The Astrophysical Journal
We investigate the mass–velocity dispersion relation (MVDR) in 29 galaxy clusters in the HIghest X-ray FLUx Galaxy Cluster Sample (HIFLUGCS). We measure the spatially resolved, line-of-sight velocity dispersion profiles of these clusters, which we find to be mostly flat at large radii, reminiscent of the rotation curves of galaxies. We discover a tight empirical relation between the baryonic mass M bar and the flat velocity dispersion σ of the member galaxies, i.e., MVDR, log(Mbar/M⊙)=4.1−0.4+0…
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