SIMBAD references

2020ApJ...891..129S - Astrophys. J., 891, 129-129 (2020/March-2)

Velocity dispersions of brightest cluster galaxies and their host clusters.


Abstract (from CDS):

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 (σcl). 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_* ,BCGcl_ ratio decreases as a function of σcl unlike the prediction from the numerical simulation of Dolag et al. The trend in σ_* ,BCGcl_ suggests that BCG formation is more efficient in lower mass halos.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Brightest cluster galaxies - Galaxy clusters - Galaxy dark matter halos - Redshift surveys

VizieR on-line data: <Available at CDS (J/ApJ/891/129): table2.dat table3.dat>

Simbad objects: 452

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