MEGA: merger graphs of structure formation

Roper, William J, Thomas, Peter A and Srisawat, Chaichalit (2020) MEGA: merger graphs of structure formation. Monthly Notices of the Royal Astronomical Society, 494 (3). pp. 4509-4524. ISSN 0035-8711

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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.

Item Type: Article
Keywords: astro-ph.GA, astro-ph.GA, astro-ph.CO
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
SWORD Depositor: Mx Elements Account
Depositing User: Mx Elements Account
Date Deposited: 21 Apr 2020 12:32
Last Modified: 21 Feb 2022 14:00

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Project NameSussex Project NumberFunderFunder Ref
From merger trees to merger graphs: improved descriptions of halo growthG2479ROYAL ASTRONOMICAL SOCIETYUnset
University of Sussex Astronomy Consolidated Grant 2017-2020G2050STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/P000525/1