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
Publicado: 2009
Materias:
Dark matter
Galaxies: haloes
Galaxies: structure
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v395_n1_pL57_Pedrosa
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 paper:paper_17453933_v395_n1_pL57_Pedrosa
record_format dspace
spelling paper:paper_17453933_v395_n1_pL57_Pedrosa2023-06-08T16:28:22Z The impact of baryons on dark matter haloes 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. 2009 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v395_n1_pL57_Pedrosa 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
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.
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
publishDate 2009
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453933_v395_n1_pL57_Pedrosa
http://hdl.handle.net/20.500.12110/paper_17453933_v395_n1_pL57_Pedrosa
_version_ 1768542287799779328

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