The impact of assembly bias on the halo occupation in hydrodynamical simulations

We investigate the variations in galaxy occupancy of the darkmatter haloes with the large-scale environment and halo formation time, using two state-of-the-art hydrodynamical cosmological simulations, EAGLE and Illustris. For both simulations, we use three galaxy samples with a fixed number density...

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Detalles Bibliográficos
Autores principales:	Artale, M.C., Zehavi, I., Contreras, S., Norberg, P.
Formato:	JOUR
Materias:	Cosmology: theory Galaxies: formation Galaxies: haloes Galaxies: statistics Large-scale structure of Universe
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00358711_v480_n3_p3978_Artale
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00358711_v480_n3_p3978_Artale
record_format	dspace
spelling	todo:paper_00358711_v480_n3_p3978_Artale2023-10-03T14:47:25Z The impact of assembly bias on the halo occupation in hydrodynamical simulations Artale, M.C. Zehavi, I. Contreras, S. Norberg, P. Cosmology: theory Galaxies: formation Galaxies: haloes Galaxies: statistics Large-scale structure of Universe We investigate the variations in galaxy occupancy of the darkmatter haloes with the large-scale environment and halo formation time, using two state-of-the-art hydrodynamical cosmological simulations, EAGLE and Illustris. For both simulations, we use three galaxy samples with a fixed number density ranked by stellar mass. For these samples, we find that low-mass haloes in the most dense environments are more likely to host a central galaxy than those in the least dense environments. When splitting the halo population by formation time, these relations are stronger. Hence, at a fixed low halo mass, early-formed haloes are more likely to host a central galaxy than late-formed haloes since they have had more time to assemble. The satellite occupation shows a reverse trend where early-formed haloes host fewer satellites due to having more time to merge with the central galaxy. We also analyse the stellar mass-halo mass relation for central galaxies in terms of the large-scale environment and formation time of the haloes. We find that low-mass haloes in themost dense environment host relatively more massive central galaxies. This trend is also found when splitting the halo population by age, with early-formed haloes hosting more massive galaxies. Our results are in agreement with previous findings from semi-analytical models, providing robust predictions for the occupancy variation signature in the halo occupation distribution of galaxy formation models. © 2018 The Author(s). JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00358711_v480_n3_p3978_Artale
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Cosmology: theory Galaxies: formation Galaxies: haloes Galaxies: statistics Large-scale structure of Universe
spellingShingle	Cosmology: theory Galaxies: formation Galaxies: haloes Galaxies: statistics Large-scale structure of Universe Artale, M.C. Zehavi, I. Contreras, S. Norberg, P. The impact of assembly bias on the halo occupation in hydrodynamical simulations
topic_facet	Cosmology: theory Galaxies: formation Galaxies: haloes Galaxies: statistics Large-scale structure of Universe
description	We investigate the variations in galaxy occupancy of the darkmatter haloes with the large-scale environment and halo formation time, using two state-of-the-art hydrodynamical cosmological simulations, EAGLE and Illustris. For both simulations, we use three galaxy samples with a fixed number density ranked by stellar mass. For these samples, we find that low-mass haloes in the most dense environments are more likely to host a central galaxy than those in the least dense environments. When splitting the halo population by formation time, these relations are stronger. Hence, at a fixed low halo mass, early-formed haloes are more likely to host a central galaxy than late-formed haloes since they have had more time to assemble. The satellite occupation shows a reverse trend where early-formed haloes host fewer satellites due to having more time to merge with the central galaxy. We also analyse the stellar mass-halo mass relation for central galaxies in terms of the large-scale environment and formation time of the haloes. We find that low-mass haloes in themost dense environment host relatively more massive central galaxies. This trend is also found when splitting the halo population by age, with early-formed haloes hosting more massive galaxies. Our results are in agreement with previous findings from semi-analytical models, providing robust predictions for the occupancy variation signature in the halo occupation distribution of galaxy formation models. © 2018 The Author(s).
format	JOUR
author	Artale, M.C. Zehavi, I. Contreras, S. Norberg, P.
author_facet	Artale, M.C. Zehavi, I. Contreras, S. Norberg, P.
author_sort	Artale, M.C.
title	The impact of assembly bias on the halo occupation in hydrodynamical simulations
title_short	The impact of assembly bias on the halo occupation in hydrodynamical simulations
title_full	The impact of assembly bias on the halo occupation in hydrodynamical simulations
title_fullStr	The impact of assembly bias on the halo occupation in hydrodynamical simulations
title_full_unstemmed	The impact of assembly bias on the halo occupation in hydrodynamical simulations
title_sort	impact of assembly bias on the halo occupation in hydrodynamical simulations
url	http://hdl.handle.net/20.500.12110/paper_00358711_v480_n3_p3978_Artale
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The impact of assembly bias on the halo occupation in hydrodynamical simulations

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