Boryana Hadzhiyska
The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
Hadzhiyska, Boryana; Eisenstein, Daniel; Hernquist, Lars; Pakmor, Rüdiger; Bose, Sownak; Delgado, Ana Maria; Contreras, Sergio; Kannan, Rahul; White, Simon D M; Springel, Volker; Frenk, Carlos; Hernández-Aguayo, César; Ferlito, Fulvio; Barrera, Monica
Authors
Daniel Eisenstein
Lars Hernquist
Rüdiger Pakmor
Dr Sownak Bose sownak.bose@durham.ac.uk
UKRI Future Leaders Fellowship
Ana Maria Delgado
Sergio Contreras
Rahul Kannan
Simon D M White
Volker Springel
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
César Hernández-Aguayo
Fulvio Ferlito
Monica Barrera
Abstract
Approximate methods to populate dark-matter haloes with galaxies are of great utility to galaxy surveys. However, the limitations of simple halo occupation models (HODs) preclude a full use of small-scale galaxy clustering data and call for more sophisticated models. We study two galaxy populations, luminous red galaxies (LRGs) and star-forming emission-line galaxies (ELGs), at two epochs, z = 1 and z = 0, in the large-volume, high-resolution hydrodynamical simulation of the MillenniumTNG project. In a partner study we concentrated on the small-scale, one-halo regime down to r ∼ 0.1 h−1 Mpc, while here we focus on modelling galaxy assembly bias in the two-halo regime, r ≳ 1 h−1 Mpc. Interestingly, the ELG signal exhibits scale dependence out to relatively large scales (r ∼ 20 h−1 Mpc), implying that the linear bias approximation for this tracer is invalid on these scales, contrary to common assumptions. The 10–15 per cent discrepancy is only reconciled when we augment our halo occupation model with a dependence on extrinsic halo properties (‘shear’ being the best-performing one) rather than intrinsic ones (e.g. concentration, peak mass). We argue that this fact constitutes evidence for two-halo galaxy conformity. Including tertiary assembly bias (i.e. a property beyond mass and ‘shear’) is not an essential requirement for reconciling the galaxy assembly bias signal of LRGs, but the combination of external and internal properties is beneficial for recovering ELG the clustering. We find that centrals in low-mass haloes dominate the assembly bias signal of both populations. Finally, we explore the predictions of our model for higher order statistics such as nearest neighbour counts. The latter supplies additional information about galaxy assembly bias and can be used to break degeneracies between halo model parameters.
Citation
Hadzhiyska, B., Eisenstein, D., Hernquist, L., Pakmor, R., Bose, S., Delgado, A. M., …Barrera, M. (2023). The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies. Monthly Notices of the Royal Astronomical Society, 524(2), 2507–2523. https://doi.org/10.1093/mnras/stad731
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 7, 2023 |
Online Publication Date | Jul 20, 2023 |
Publication Date | 2023-09 |
Deposit Date | Feb 6, 2024 |
Publicly Available Date | Feb 6, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 524 |
Issue | 2 |
Pages | 2507–2523 |
DOI | https://doi.org/10.1093/mnras/stad731 |
Public URL | https://durham-repository.worktribe.com/output/2227350 |
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Copyright Statement
© 2023 The Author(s)
Published by Oxford University Press on behalf of Royal Astronomical Society
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