Sussing merger trees: stability and convergence
Merger trees are routinely used to follow the growth and merging history of dark matter haloes and subhaloes in simulations of cosmic structure formation. Srisawat et al. compared a wide range of merger-tree-building codes. Here we test the influence of output strategies and mass resolution on tree-...
| Main Authors: | , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Article |
| Published: |
Oxford University Press
2016
|
| Subjects: | |
| Online Access: | https://eprints.nottingham.ac.uk/42481/ |
| _version_ | 1848796496144629760 |
|---|---|
| author | Wang, Yang Pearce, Frazer R. Knebe, Alexander Schneider, Aurel Srisawat, Chaichalit Tweed, Dylan Jung, Intae Han, Jiaxin Helly, John Onions, Julian Elahi, Pascal J. Thomas, Peter A. Behroozi, Peter Yi, Sukyoung K. Rodriguez-Gomez, Vicente Mao, Yao-Yuan Jing, Yipeng Lin, Weipeng |
| author_facet | Wang, Yang Pearce, Frazer R. Knebe, Alexander Schneider, Aurel Srisawat, Chaichalit Tweed, Dylan Jung, Intae Han, Jiaxin Helly, John Onions, Julian Elahi, Pascal J. Thomas, Peter A. Behroozi, Peter Yi, Sukyoung K. Rodriguez-Gomez, Vicente Mao, Yao-Yuan Jing, Yipeng Lin, Weipeng |
| author_sort | Wang, Yang |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | Merger trees are routinely used to follow the growth and merging history of dark matter haloes and subhaloes in simulations of cosmic structure formation. Srisawat et al. compared a wide range of merger-tree-building codes. Here we test the influence of output strategies and mass resolution on tree-building. We find that, somewhat surprisingly, building the tree from more snapshots does not generally produce more complete trees; instead, it tends to shorten them. Significant improvements are seen for patching schemes that attempt to bridge over occasional dropouts in the underlying halo catalogues or schemes that combine the halo-finding and tree-building steps seamlessly. The adopted output strategy does not affect the average number of branches (bushiness) of the resultant merger trees. However, mass resolution has an influence on both main branch length and the bushiness. As the resolution increases, a halo with the same mass can be traced back further in time and will encounter more small progenitors during its evolutionary history. Given these results, we recommend that, for simulations intended as precursors for galaxy formation models where of the order of 100 or more snapshots are analysed, the tree-building routine should be integrated with the halo finder, or at the very least be able to patch over multiple adjacent snapshots. |
| first_indexed | 2025-11-14T19:48:54Z |
| format | Article |
| id | nottingham-42481 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:48:54Z |
| publishDate | 2016 |
| publisher | Oxford University Press |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-424812020-05-04T17:39:55Z https://eprints.nottingham.ac.uk/42481/ Sussing merger trees: stability and convergence Wang, Yang Pearce, Frazer R. Knebe, Alexander Schneider, Aurel Srisawat, Chaichalit Tweed, Dylan Jung, Intae Han, Jiaxin Helly, John Onions, Julian Elahi, Pascal J. Thomas, Peter A. Behroozi, Peter Yi, Sukyoung K. Rodriguez-Gomez, Vicente Mao, Yao-Yuan Jing, Yipeng Lin, Weipeng Merger trees are routinely used to follow the growth and merging history of dark matter haloes and subhaloes in simulations of cosmic structure formation. Srisawat et al. compared a wide range of merger-tree-building codes. Here we test the influence of output strategies and mass resolution on tree-building. We find that, somewhat surprisingly, building the tree from more snapshots does not generally produce more complete trees; instead, it tends to shorten them. Significant improvements are seen for patching schemes that attempt to bridge over occasional dropouts in the underlying halo catalogues or schemes that combine the halo-finding and tree-building steps seamlessly. The adopted output strategy does not affect the average number of branches (bushiness) of the resultant merger trees. However, mass resolution has an influence on both main branch length and the bushiness. As the resolution increases, a halo with the same mass can be traced back further in time and will encounter more small progenitors during its evolutionary history. Given these results, we recommend that, for simulations intended as precursors for galaxy formation models where of the order of 100 or more snapshots are analysed, the tree-building routine should be integrated with the halo finder, or at the very least be able to patch over multiple adjacent snapshots. Oxford University Press 2016-03-30 Article PeerReviewed Wang, Yang, Pearce, Frazer R., Knebe, Alexander, Schneider, Aurel, Srisawat, Chaichalit, Tweed, Dylan, Jung, Intae, Han, Jiaxin, Helly, John, Onions, Julian, Elahi, Pascal J., Thomas, Peter A., Behroozi, Peter, Yi, Sukyoung K., Rodriguez-Gomez, Vicente, Mao, Yao-Yuan, Jing, Yipeng and Lin, Weipeng (2016) Sussing merger trees: stability and convergence. Monthly Notices of the Royal Astronomical Society, 459 (2). pp. 1554-1568. ISSN 1365-2966 methods: numerical galaxies: haloes– galaxies: evolution dark matter https://academic.oup.com/mnras/article-lookup/doi/10.1093/mnras/stw726 doi:10.1093/mnras/stw726 doi:10.1093/mnras/stw726 |
| spellingShingle | methods: numerical galaxies: haloes– galaxies: evolution dark matter Wang, Yang Pearce, Frazer R. Knebe, Alexander Schneider, Aurel Srisawat, Chaichalit Tweed, Dylan Jung, Intae Han, Jiaxin Helly, John Onions, Julian Elahi, Pascal J. Thomas, Peter A. Behroozi, Peter Yi, Sukyoung K. Rodriguez-Gomez, Vicente Mao, Yao-Yuan Jing, Yipeng Lin, Weipeng Sussing merger trees: stability and convergence |
| title | Sussing merger trees: stability and convergence |
| title_full | Sussing merger trees: stability and convergence |
| title_fullStr | Sussing merger trees: stability and convergence |
| title_full_unstemmed | Sussing merger trees: stability and convergence |
| title_short | Sussing merger trees: stability and convergence |
| title_sort | sussing merger trees: stability and convergence |
| topic | methods: numerical galaxies: haloes– galaxies: evolution dark matter |
| url | https://eprints.nottingham.ac.uk/42481/ https://eprints.nottingham.ac.uk/42481/ https://eprints.nottingham.ac.uk/42481/ |