The impact of baryons on dark matter haloes

We analyse the dark matter (DM) distribution in an ≈ 1012 M⊙ halo extracted from a simulation consistent with the concordance cosmology, where the physics regulating the transformation of gas into stars was allowed to change producing galaxies with different morphologies. Although the DM profiles ge...

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Detalles Bibliográficos
Autores principales:	Pedrosa, S., Tissera, P.B., Scannapieco, C.
Formato:	JOUR
Materias:	Dark matter Galaxies: haloes Galaxies: structure
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_17453933_v395_n1_pL57_Pedrosa
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_17453933_v395_n1_pL57_Pedrosa
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spelling	todo:paper_17453933_v395_n1_pL57_Pedrosa2023-10-03T16:31:59Z The impact of baryons on dark matter haloes Pedrosa, S. Tissera, P.B. Scannapieco, C. Dark matter Galaxies: haloes Galaxies: structure We analyse the dark matter (DM) distribution in an ≈ 1012 M⊙ halo extracted from a simulation consistent with the concordance cosmology, where the physics regulating the transformation of gas into stars was allowed to change producing galaxies with different morphologies. Although the DM profiles get more concentrated as baryons are collected at the centre of the haloes compared to a pure dynamical run, the total baryonic mass alone is not enough to fully predict the reaction of the DM profile. We also note that baryons affect the DM distribution even outside the central regions. Those systems where the transformation of gas into stars is regulated by supernova (SN) feedback, so that significant disc structures are able to form, are found to have more concentrated DM profiles than a galaxy which has efficiently transformed most of its baryons into stars at early times. The accretion of satellites is found to be associated with an expansion of the DM profiles, triggered by angular momentum transfer from the incoming satellites. As the impact of SN feedback increases, the satellites get less massive and are even strongly disrupted before getting close to the main structure causing less angular momentum transfer. Our findings suggest that the response of the DM halo is driven by the history of assembly of baryons into a galaxy along their merger tree. © 2009 The Authors. Journal compilation © 2009 RAS. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_17453933_v395_n1_pL57_Pedrosa
institution	Universidad de Buenos Aires
institution_str	I-28
repository_str	R-134
collection	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
topic	Dark matter Galaxies: haloes Galaxies: structure
spellingShingle	Dark matter Galaxies: haloes Galaxies: structure Pedrosa, S. Tissera, P.B. Scannapieco, C. The impact of baryons on dark matter haloes
topic_facet	Dark matter Galaxies: haloes Galaxies: structure
description	We analyse the dark matter (DM) distribution in an ≈ 1012 M⊙ halo extracted from a simulation consistent with the concordance cosmology, where the physics regulating the transformation of gas into stars was allowed to change producing galaxies with different morphologies. Although the DM profiles get more concentrated as baryons are collected at the centre of the haloes compared to a pure dynamical run, the total baryonic mass alone is not enough to fully predict the reaction of the DM profile. We also note that baryons affect the DM distribution even outside the central regions. Those systems where the transformation of gas into stars is regulated by supernova (SN) feedback, so that significant disc structures are able to form, are found to have more concentrated DM profiles than a galaxy which has efficiently transformed most of its baryons into stars at early times. The accretion of satellites is found to be associated with an expansion of the DM profiles, triggered by angular momentum transfer from the incoming satellites. As the impact of SN feedback increases, the satellites get less massive and are even strongly disrupted before getting close to the main structure causing less angular momentum transfer. Our findings suggest that the response of the DM halo is driven by the history of assembly of baryons into a galaxy along their merger tree. © 2009 The Authors. Journal compilation © 2009 RAS.
format	JOUR
author	Pedrosa, S. Tissera, P.B. Scannapieco, C.
author_facet	Pedrosa, S. Tissera, P.B. Scannapieco, C.
author_sort	Pedrosa, S.
title	The impact of baryons on dark matter haloes
title_short	The impact of baryons on dark matter haloes
title_full	The impact of baryons on dark matter haloes
title_fullStr	The impact of baryons on dark matter haloes
title_full_unstemmed	The impact of baryons on dark matter haloes
title_sort	impact of baryons on dark matter haloes
url	http://hdl.handle.net/20.500.12110/paper_17453933_v395_n1_pL57_Pedrosa
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The impact of baryons on dark matter haloes

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