Evaluate CTree compatibility across a broad range of catalogues

Evaluate the compatibility and performance of CTree, the branch-wise merger-tree builder, across a wide variety of halo and galaxy catalogue formats beyond the VELOCIraptor and HaloMaker catalogues tested in the paper.

Background

CTree is designed to operate on diverse halo and galaxy catalogues using minimal input information, specifically object identifiers and constituent-particle identifiers. The paper validates the method primarily with VELOCIraptor catalogues and additionally reports unpublished tests with HaloMaker catalogues.

The authors explicitly state that compatibility with a wide variety of catalogues has not yet been evaluated. Establishing this compatibility is therefore an unresolved task relevant to determining how broadly CTree can be applied to simulations and structure-finder outputs.

References

Although the compatibility of CTree\ has not yet been evaluated across a wide variety of catalogues, we verified that it performs well on HaloMaker catalogues, although these results are not shown here.

— CTree: Branch-wise compatible merger tree builder  (2609.08086 - Rhee et al., 8 Sep 2026) in Section Conclusion