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MEGA: merger graphs of structure formation

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Version 2 2023-06-12, 09:26
Version 1 2023-06-09, 21:02
journal contribution
posted on 2023-06-12, 09:26 authored by William J Roper, Peter ThomasPeter Thomas, Chaichalit Srisawat
When following the growth of structure in the Universe, we propose replacing merger trees with merger graphs, in which haloes can both merge and split into separate pieces. We show that this leads to smoother mass growth and eliminates catastrophic failures in which massive haloes have no progenitors or descendants. For those who prefer to stick with merger trees, we find that trees derived from our merger graphs have similar mass growth properties to previous methods, but again without catastrophic failures. For future galaxy formation modelling, two different density thresholds can be used to distinguish host haloes (extended galactic haloes, groups and clusters) from higher-density subhaloes: sites of galaxy formation.

Funding

From merger trees to merger graphs: improved descriptions of halo growth; G2479; ROYAL ASTRONOMICAL SOCIETY

University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1

History

Publication status

  • Published

File Version

  • Published version

Journal

Monthly Notices of the Royal Astronomical Society

ISSN

0035-8711

Publisher

Oxford University Press

Issue

3

Volume

494

Page range

4509-4524

Department affiliated with

  • Physics and Astronomy Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2020-04-21

First Open Access (FOA) Date

2020-04-21

First Compliant Deposit (FCD) Date

2020-04-02

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