Low-metallicity stellar halo populations as tracers of dark matter haloes

We analyse the density profiles of the stellar halo populations in eight MilkyWay mass galaxies, simulatedwithin theΔcold dark matter scenario.We find that accreted stars can be well fitted by an Einasto profile, as well as any subsample defined according to metallicity.We detect a clear correlation...

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Detalles Bibliográficos
Autores principales:	Tissera, P.B., Scannapieco, C.
Formato:	JOUR
Materias:	Galaxies evolution Galaxies formation Galaxies haloes Galaxy structure
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_17453925_v445_n1_pL21_Tissera
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_17453925_v445_n1_pL21_Tissera
record_format	dspace
spelling	todo:paper_17453925_v445_n1_pL21_Tissera2023-10-03T16:31:57Z Low-metallicity stellar halo populations as tracers of dark matter haloes Tissera, P.B. Scannapieco, C. Galaxies evolution Galaxies formation Galaxies haloes Galaxy structure We analyse the density profiles of the stellar halo populations in eight MilkyWay mass galaxies, simulatedwithin theΔcold dark matter scenario.We find that accreted stars can be well fitted by an Einasto profile, as well as any subsample defined according to metallicity.We detect a clear correlation between the Einasto fitting parameters of the low-metallicity stellar populations and those of the dark matter (DM) haloes. The correlations for stars with [Fe/H] < -3 allow us to predict the shape of the dark matter profiles within residuals of ~10 per cent, in case the contribution from in situ stars remains small. Using Einasto parameters estimated for the stellar halo of the Milky Way and assuming the later formed with significant contributions from accreted low-mass satellite, our simulations predict α ~ 0.15 and r<inf>2</inf> ~ 15 kpc for its dark matter profile. These values, combined with observed estimations of the local DM density, yield an enclosed DM mass at ~8 kpc in the range 3.9-6.7 × 1010 M⊙, in agreement with recent observational results. These findings suggest that low-metallicity stellar haloes could store relevant information on the DM haloes. Forthcoming observations would help us to further constrain our models and predictions. © 2014 The Authors. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17453925_v445_n1_pL21_Tissera
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Galaxies evolution Galaxies formation Galaxies haloes Galaxy structure
spellingShingle	Galaxies evolution Galaxies formation Galaxies haloes Galaxy structure Tissera, P.B. Scannapieco, C. Low-metallicity stellar halo populations as tracers of dark matter haloes
topic_facet	Galaxies evolution Galaxies formation Galaxies haloes Galaxy structure
description	We analyse the density profiles of the stellar halo populations in eight MilkyWay mass galaxies, simulatedwithin theΔcold dark matter scenario.We find that accreted stars can be well fitted by an Einasto profile, as well as any subsample defined according to metallicity.We detect a clear correlation between the Einasto fitting parameters of the low-metallicity stellar populations and those of the dark matter (DM) haloes. The correlations for stars with [Fe/H] < -3 allow us to predict the shape of the dark matter profiles within residuals of ~10 per cent, in case the contribution from in situ stars remains small. Using Einasto parameters estimated for the stellar halo of the Milky Way and assuming the later formed with significant contributions from accreted low-mass satellite, our simulations predict α ~ 0.15 and r<inf>2</inf> ~ 15 kpc for its dark matter profile. These values, combined with observed estimations of the local DM density, yield an enclosed DM mass at ~8 kpc in the range 3.9-6.7 × 1010 M⊙, in agreement with recent observational results. These findings suggest that low-metallicity stellar haloes could store relevant information on the DM haloes. Forthcoming observations would help us to further constrain our models and predictions. © 2014 The Authors.
format	JOUR
author	Tissera, P.B. Scannapieco, C.
author_facet	Tissera, P.B. Scannapieco, C.
author_sort	Tissera, P.B.
title	Low-metallicity stellar halo populations as tracers of dark matter haloes
title_short	Low-metallicity stellar halo populations as tracers of dark matter haloes
title_full	Low-metallicity stellar halo populations as tracers of dark matter haloes
title_fullStr	Low-metallicity stellar halo populations as tracers of dark matter haloes
title_full_unstemmed	Low-metallicity stellar halo populations as tracers of dark matter haloes
title_sort	low-metallicity stellar halo populations as tracers of dark matter haloes
url	http://hdl.handle.net/20.500.12110/paper_17453925_v445_n1_pL21_Tissera
work_keys_str_mv	AT tisserapb lowmetallicitystellarhalopopulationsastracersofdarkmatterhaloes AT scannapiecoc lowmetallicitystellarhalopopulationsastracersofdarkmatterhaloes
_version_	1807318140805185536

Low-metallicity stellar halo populations as tracers of dark matter haloes

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