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The Environmental Dependence of the Stellar Mass - Gas Metallicity Relation in Horizon Run 5

Rowntree, Aaron; Singh, Ankit; Vincenzo, Fiorenzo; Gibson, Brad; Gouin, Céline; Galárraga-Espinosa, Daniela; Lee, Jaehyun; Kim, Juhan; Laigle, Clotilde; Park, Changbom; Pichon, Christophe; Few, Gareth; Hong, Sungwook E; Kim, Yonghwi


Aaron Rowntree

Ankit Singh

Brad Gibson

Céline Gouin

Daniela Galárraga-Espinosa

Jaehyun Lee

Juhan Kim

Clotilde Laigle

Changbom Park

Christophe Pichon

Sungwook E Hong

Yonghwi Kim


Metallicity offers a unique window into the baryonic history of the cosmos, being instrumental in probing evolutionary processes in galaxies between different cosmic environments. We aim to quantify the contribution of these environments to the scatter in the mass-metallicity relation (MZR) of galaxies. By analysing the galaxy distribution within the cosmic skeleton of the Horizon Run 5 cosmological hydrodynamical simulation at redshift z = 0.625, computed using a careful calibration of the T-ReX filament finder, we identify galaxies within three main environments: nodes, filaments and voids. We also classify galaxies based on the dynamical state of the clusters and the length of the filaments in which they reside. We find that the cosmic environment significantly contributes to the scatter in the MZR; in particular, both the gas metallicity and its average relative standard deviation increase when considering denser large-scale environments. The difference in the average metallicity between galaxies within relaxed and unrelaxed clusters is ≈0.1dex, with both populations displaying positive residuals, δZg, from the averaged MZR. Moreover, the difference in metallicity between node and void galaxies accounts for ≈0.14 dex in the scatter of the MZR at stellar mass M⋆ ≈ 109.35 M⊙. Finally, both the average [O/Fe] in the gas and the galaxy gas fraction decrease when moving to higher large-scale densities in the simulation, suggesting that the cores of cosmic environments host – on average – older and more massive galaxies, whose enrichment is affected by a larger number of Type Ia Supernova events.


Rowntree, A., Singh, A., Vincenzo, F., Gibson, B., Gouin, C., Galárraga-Espinosa, D., …Kim, Y. (in press). The Environmental Dependence of the Stellar Mass - Gas Metallicity Relation in Horizon Run 5. Monthly notices of the Royal Astronomical Society, Article stae1384.

Journal Article Type Article
Acceptance Date May 31, 2024
Online Publication Date Jun 3, 2024
Deposit Date Jun 11, 2024
Publicly Available Date Jun 11, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Article Number stae1384
Keywords Cosmology: large-scale structure; Galaxies: formation; Galaxies: evolution; Galaxies: kinematics and dynamics; Galaxies: high-redshift; Methods: numerical
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Copyright Statement
© The Author(s) 2024. 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 (, which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.

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