Galaxy and Halo Root Systems: Fingerprints of Mass Assembly
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912334661812224 |
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| author | Neyrinck, Mark Aragón-Calvo, Miguel Szapudi, István |
| author_facet | Neyrinck, Mark Aragón-Calvo, Miguel Szapudi, István |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2503_21015 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Galaxy and Halo Root Systems: Fingerprints of Mass Assembly Neyrinck, Mark Aragón-Calvo, Miguel Szapudi, István Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies 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. |
| title | Galaxy and Halo Root Systems: Fingerprints of Mass Assembly |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2503.21015 |