Cadiou, C;
Pontzen, A;
Peiris, HV;
Lucie-Smith, L;
(2021)
The causal effect of environment on halo mass and concentration.
Monthly Notices of the Royal Astronomical Society
, 508
(1)
pp. 1189-1194.
10.1093/mnras/stab2650.
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Abstract
Understanding the impact of environment on the formation and evolution of dark matter haloes and galaxies is a crucial open problem. Studying statistical correlations in large simulated populations sheds some light on these impacts, but the causal effect of an environment on individual objects is harder to pinpoint. Addressing this, we present a new method for resimulating a single dark matter halo in multiple large-scale environments. In the initial conditions, we ‘splice’ (i.e. insert) the Lagrangian region of a halo into different Gaussian random fields, while enforcing consistency with the statistical properties of Lambda cold dark matter. Applying this technique, we demonstrate that the mass of haloes is primarily determined by the density structure inside their Lagrangian patches, while the haloes’ concentration is more strongly affected by environment. The splicing approach will also allow us to study, for example, the impact of the cosmic web on accretion processes and galaxy quenching.
| Type: | Article |
|---|---|
| Title: | The causal effect of environment on halo mass and concentration |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab2650 |
| Publisher version: | http://dx.doi.org/10.1093/mnras/stab2650 |
| Language: | English |
| Additional information: | © The Author(s) 2021. Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | methods: numerical, galaxies: formation, galaxies: haloes, dark matter |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10134974 |
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