Galaxy and Halo Root Systems: Fingerprints of Mass Assembly

We discuss what we call halo or galaxy root systems, collections of particle pathlines that show the infall of matter from the initial uniform distribution into a collapsed structure. The matter clumps as it falls in; projected through time, it produces filamentary density enhancements analogous to tree roots and branches, blood vessels, or even human transportation infrastructure in cities and regions. This relates to the larger-scale cosmic web, but is defined locally about one of its nodes: a physical, geometric version of a merger tree. We find dark-matter-halo root systems on average to exhibit more roots and root branches for the largest cluster haloes than in small haloes. This may relate to the `cosmic-web detachment’ mechanism that likely contributes to star-formation quenching in galaxy groups and clusters. We also find that high spin manifests in these root systems as curvier roots.