A machine learning approach to mapping baryons on to dark matter haloes using the eagle and C-EAGLE simulations

Lovell, Christopher C, Wilkins, Stephen M, Thomas, Peter A, Schaller, Matthieu, Baugh, Carlton M, Fabbian, Giulio ORCID: https://orcid.org/0000-0002-3255-4695 and Bahé, Yannick 2022. A machine learning approach to mapping baryons on to dark matter haloes using the eagle and C-EAGLE simulations. Monthly Notices of the Royal Astronomical Society 10.1093/mnras/stab3221

PDF - Published Version Available under License Creative Commons Attribution. Download (2MB)

Abstract

High-resolution cosmological hydrodynamic simulations are currently limited to relatively small volumes due to their computational expense. However, much larger volumes are required to probe rare, overdense environments, and measure clustering statistics of the large-scale structure. Typically, zoom simulations of individual regions are used to study rare environments, and semi-analytic models and halo occupation models applied to dark-matter-only (DMO) simulations are used to study the Universe in the large-volume regime. We propose a new approach, using a machine learning framework, to explore the halo–galaxy relationship in the periodic EAGLE simulations, and zoom C-EAGLE simulations of galaxy clusters. We train a tree-based machine learning method to predict the baryonic properties of galaxies based on their host dark matter halo properties. The trained model successfully reproduces a number of key distribution functions for an infinitesimal fraction of the computational cost of a full hydrodynamic simulation. By training on both periodic simulations and zooms of overdense environments, we learn the bias of galaxy evolution in differing environments. This allows us to apply the trained model to a larger DMO volume than would be possible if we only trained on a periodic simulation. We demonstrate this application using the (800 Mpc)3 P-Millennium simulation, and present predictions for key baryonic distribution functions and clustering statistics from the EAGLE model in this large volume.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Date of First Compliant Deposit:	26 January 2023
Date of Acceptance:	2 November 2021
Last Modified:	03 May 2023 07:35
URI:	https://orca.cardiff.ac.uk/id/eprint/156014

Actions (repository staff only)

Edit Item