Kavli Affiliate: Mark Vogelsberger
| First 5 Authors: Jubee Sohn, Margaret J. Geller, Mark Vogelsberger, Ivana Danjanov,
| Summary:
We use the Illustris-TNG simulations to explore the dynamic scaling relation
between massive clusters and their central galaxies (BCGs). The Illustris
TNG300-1 simulation we use includes 280 massive clusters with $M_{200} >
10^{14}$ M$_{odot}$ enabling a robust statistical analysis. We derive the
line-of-sight velocity dispersion of the stellar particles of the BCGs
($sigma_{*, BCG}$), analogous to the observed BCG stellar velocity dispersion.
We also compute the subhalo velocity dispersion to measure the cluster velocity
dispersion ($sigma_{cl}$). Both $sigma_{*, BCG}$ and $sigma_{cl}$ are
proportional to the cluster halo mass, but the slopes differ slightly. Thus
like the observed relation, $sigma_{*, BCG} / sigma_{cl}$ declines as a
function of $sigma_{cl}$, but the scatter is large. We explore the redshift
evolution of $sigma_{*, BCG} – sigma_{cl}$ scaling relation for $z lesssim
1$ 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 $sigma_{*, BCG}$. The simulations imply that
high redshift BCGs are dynamically more complex than their low redshift
counterparts.
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