Abstract
Abstract
We use IllustrisTNG simulations to explore the dynamic scaling relation between massive clusters and their—central—brightest cluster galaxies (BCGs). The IllustrisTNG-300 simulation we use includes 280 massive clusters from the z = 0 snapshot with M
200 > 1014
M
⊙, enabling a robust statistical analysis. We derive the line-of-sight velocity dispersion of the stellar particles of the BCGs (σ
*,BCG), analogous to the observed BCG stellar velocity dispersion. We also compute the subhalo velocity dispersion to measure the cluster velocity dispersion (σ
cl). Both σ
*,BCG and σ
cl are proportional to the cluster halo mass, but the slopes differ slightly. Thus, like the observed relation, σ
*,BCG/σ
cl declines as a function of σ
cl, but the scatter is large. We explore the redshift evolution of the σ
*,BCG − σ
cl scaling relation for z ≲ 1 in a way that can be compared directly with observations. The scaling relation has a similar slope at high redshift, but the scatter increases because of the large scatter in σ
*,BCG. The simulations imply that high-redshift BCGs are dynamically more complex than their low-redshift counterparts.
Publisher
American Astronomical Society
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
3 articles.
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