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Sussing merger trees: the impact of halo merger trees on galaxy properties in a semi-analytic model

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posted on 2023-06-08, 18:55 authored by Jaehyun Lee, Sukyoung K Yi, Pascal J Elahi, Peter ThomasPeter Thomas, Frazer R Pearce, Peter Behroozi, Jiaxin Han, John Helly, Intae Jung, Alexander Knebe, Yao- Yuan Mao, Julian Onions, Vicente Rodriguez-Gomez, Aurel Schneider, Chaichalit Srisawat, Dylan Tweed
A halo merger tree forms the essential backbone of a semi-analytic model for galaxy formation and evolution. Recent studies have pointed out that extracting merger trees from numerical simulations of structure formation is non-trivial; different tree building algorithms can give differing merger histories. These differences should be carefully understood before merger trees are used as input for models of galaxy formation. We investigate the impact of different halo merger trees on a semi-analytic model. We find that the z=0 galaxy properties in our model show differences between trees when using a common parameter set. The star formation history of the Universe and the properties of satellite galaxies can show marked differences between trees with different construction methods. Independently calibrating the semi-analytic model for each tree can reduce the discrepancies between the z=0 global galaxy properties, at the cost of increasing the differences in the evolutionary histories of galaxies. Furthermore, the underlying physics implied can vary, resulting in key quantities such as the supernova feedback efficiency differing by factors of 2. Such a change alters the regimes where star formation is primarily suppressed by supernovae. Therefore, halo merger trees extracted from a common halo catalogue using different, but reliable, algorithms can result in a difference in the semi-analytic model. Given the uncertainties in galaxy formation physics, however, these differences may not necessarily be viewed as significant.

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

4

Volume

445

Page range

4197-4210

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • Yes

Peer reviewed?

  • Yes

Legacy Posted Date

2014-11-10

First Open Access (FOA) Date

2014-11-10

First Compliant Deposit (FCD) Date

2014-11-10

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