The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies

Approximate methodsto populate dark-matter haloes with galaxies are of great utility to galaxy surveys. However, the limitationsof simple halo occupation models(HODs) preclude a full use of small-scale galaxy clustering data and call for more sophisticatedmodels. We study two galaxy populations, lum...

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Autores: Hadzhiyska, Boryana, Eisenstein, Daniel, Hernquist, Lars, Pakmor, Rüdiger, Bose, Sownak, Contreras Hantke, Sergio Antonio, Barrera, Mónica
Formato: artículo
Estado:Versión publicada
Fecha de publicación:2023
País:España
Recursos:Universidad de Sevilla (US)
Repositorio:idUS. Depósito de Investigación de la Universidad de Sevilla
OAI Identifier:oai:idus.us.es:11441/178573
Acesso em linha:https://hdl.handle.net/11441/178573
https://doi.org/10.1093/mnras/stad731
Access Level:acceso abierto
Palavra-chave:Galaxies: haloes
Large-scale structure of Universe
Cosmology: theory
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spelling The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxiesHadzhiyska, BoryanaEisenstein, DanielHernquist, LarsPakmor, RüdigerBose, SownakContreras Hantke, Sergio AntonioBarrera, MónicaGalaxies: haloesLarge-scale structure of UniverseCosmology: theoryApproximate methodsto populate dark-matter haloes with galaxies are of great utility to galaxy surveys. However, the limitationsof simple halo occupation models(HODs) preclude a full use of small-scale galaxy clustering data and call for more sophisticatedmodels. 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.Oxford University PressFísica Atómica, Molecular y NuclearResearch and Innovation (UKRI). United KingdomDurham UniversityDeutsche Forschungsgemeinschaft / German Research Foundation (DFG)2023info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionapplication/pdfapplication/pdfhttps://hdl.handle.net/11441/178573https://doi.org/10.1093/mnras/stad731reponame:idUS. Depósito de Investigación de la Universidad de Sevillainstname:Universidad de Sevilla (US)InglésMonthly Notices of the Royal Astronomical Society, 524 (2), 2507-2523.MR/V023381/1ST/K00042X/1ST/P002293/1ST/R002371/1ST/S002502/1ST/R000832/1EXC-2094–390783311https://doi.org/10.1093/mnras/stad731info:eu-repo/semantics/openAccessoai:idus.us.es:11441/1785732026-06-17T12:51:07Z
dc.title.none.fl_str_mv The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
title The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
spellingShingle The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
Hadzhiyska, Boryana
Galaxies: haloes
Large-scale structure of Universe
Cosmology: theory
title_short The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
title_full The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
title_fullStr The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
title_full_unstemmed The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
title_sort The MillenniumTNG Project: an improved two-halo model for the galaxy–halo connection of red and blue galaxies
dc.creator.none.fl_str_mv Hadzhiyska, Boryana
Eisenstein, Daniel
Hernquist, Lars
Pakmor, Rüdiger
Bose, Sownak
Contreras Hantke, Sergio Antonio
Barrera, Mónica
author Hadzhiyska, Boryana
author_facet Hadzhiyska, Boryana
Eisenstein, Daniel
Hernquist, Lars
Pakmor, Rüdiger
Bose, Sownak
Contreras Hantke, Sergio Antonio
Barrera, Mónica
author_role author
author2 Eisenstein, Daniel
Hernquist, Lars
Pakmor, Rüdiger
Bose, Sownak
Contreras Hantke, Sergio Antonio
Barrera, Mónica
author2_role author
author
author
author
author
author
dc.contributor.none.fl_str_mv Física Atómica, Molecular y Nuclear
Research and Innovation (UKRI). United Kingdom
Durham University
Deutsche Forschungsgemeinschaft / German Research Foundation (DFG)
dc.subject.none.fl_str_mv Galaxies: haloes
Large-scale structure of Universe
Cosmology: theory
topic Galaxies: haloes
Large-scale structure of Universe
Cosmology: theory
description Approximate methodsto populate dark-matter haloes with galaxies are of great utility to galaxy surveys. However, the limitationsof simple halo occupation models(HODs) preclude a full use of small-scale galaxy clustering data and call for more sophisticatedmodels. 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.
publishDate 2023
dc.date.none.fl_str_mv 2023
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/11441/178573
https://doi.org/10.1093/mnras/stad731
url https://hdl.handle.net/11441/178573
https://doi.org/10.1093/mnras/stad731
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Monthly Notices of the Royal Astronomical Society, 524 (2), 2507-2523.
MR/V023381/1
ST/K00042X/1
ST/P002293/1
ST/R002371/1
ST/S002502/1
ST/R000832/1
EXC-2094–390783311
https://doi.org/10.1093/mnras/stad731
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:idUS. Depósito de Investigación de la Universidad de Sevilla
instname:Universidad de Sevilla (US)
instname_str Universidad de Sevilla (US)
reponame_str idUS. Depósito de Investigación de la Universidad de Sevilla
collection idUS. Depósito de Investigación de la Universidad de Sevilla
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,811543

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