Robustness of distinct cluster feature-importance trends

Determine whether the higher formation-redshift importance and lower gas-mass importance observed for cluster central galaxies, relative to group and field central galaxies, persist in statistically larger samples of cluster-sized halos.

Background

Only 17 cluster-sized halos are available in the TNG100 sample, preventing statistically reliable conclusions about cluster-specific trends. The analysis suggests that cluster centrals differ from group and field centrals in the importance of formation redshift and gas mass for predicting host-halo mass. The authors explicitly leave unresolved whether these differences persist as the number of cluster-sized halos increases and whether they distinguish clusters from groups in the same simulation.

References

Whether or not this trend holds as the number of cluster sized halos increases remains to be seen, and it would be an interesting analysis to see how they differ from group sized halos in the same simulation.

— Inferring the Dark from the Observable: Estimating Halo Masses Using Galaxy Properties  (2608.19154 - Chen et al., 19 Aug 2026) in Section 5, “Conclusion and Future Prospects” (label: sec:conclusion)