Sussing merger trees

Stability and convergence

Yang Wang, Frazer R. Pearce, Alexander Knebe, Aurel Schneider, Chaichalit Srisawat, Dylan Tweed, Intae Jung, Jiaxin Han, John Helly, Julian Onions, Pascal J. Elahi, Peter A. Thomas, Peter Behroozi, Sukyoung Yi, Vicente Rodriguez-Gomez, Yao Yuan Mao, Yipeng Jing, Weipeng Lin

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

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 treebuilding 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.

Original languageEnglish
Pages (from-to)1554-1568
Number of pages15
JournalMonthly Notices of the Royal Astronomical Society
Volume459
Issue number2
DOIs
Publication statusPublished - 2016 Jun 21

Fingerprint

merger
halos
history
simulation
histories
dropouts
output
galactic evolution
encounters
catalogs
dark matter

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Wang, Y., Pearce, F. R., Knebe, A., Schneider, A., Srisawat, C., Tweed, D., ... Lin, W. (2016). Sussing merger trees: Stability and convergence. Monthly Notices of the Royal Astronomical Society, 459(2), 1554-1568. https://doi.org/10.1093/mnras/stw726
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 ; Rodriguez-Gomez, Vicente ; Mao, Yao Yuan ; Jing, Yipeng ; Lin, Weipeng. / Sussing merger trees : Stability and convergence. In: Monthly Notices of the Royal Astronomical Society. 2016 ; Vol. 459, No. 2. pp. 1554-1568.
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Wang, Y, Pearce, FR, Knebe, A, Schneider, A, Srisawat, C, Tweed, D, Jung, I, Han, J, Helly, J, Onions, J, Elahi, PJ, Thomas, PA, Behroozi, P, Yi, S, Rodriguez-Gomez, V, Mao, YY, Jing, Y & Lin, W 2016, 'Sussing merger trees: Stability and convergence', Monthly Notices of the Royal Astronomical Society, vol. 459, no. 2, pp. 1554-1568. https://doi.org/10.1093/mnras/stw726

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; Rodriguez-Gomez, Vicente; Mao, Yao Yuan; Jing, Yipeng; Lin, Weipeng.

In: Monthly Notices of the Royal Astronomical Society, Vol. 459, No. 2, 21.06.2016, p. 1554-1568.

Research output: Contribution to journalArticle

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AU - Wang, Yang

AU - Pearce, Frazer R.

AU - Knebe, Alexander

AU - Schneider, Aurel

AU - Srisawat, Chaichalit

AU - Tweed, Dylan

AU - Jung, Intae

AU - Han, Jiaxin

AU - Helly, John

AU - Onions, Julian

AU - Elahi, Pascal J.

AU - Thomas, Peter A.

AU - Behroozi, Peter

AU - Yi, Sukyoung

AU - Rodriguez-Gomez, Vicente

AU - Mao, Yao Yuan

AU - Jing, Yipeng

AU - Lin, Weipeng

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Wang Y, Pearce FR, Knebe A, Schneider A, Srisawat C, Tweed D et al. Sussing merger trees: Stability and convergence. Monthly Notices of the Royal Astronomical Society. 2016 Jun 21;459(2):1554-1568. https://doi.org/10.1093/mnras/stw726