Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe

Context. The standard disc formation scenario postulates that the disc forms as the gas cools and flows into the centre of the dark matter halo, conserving the specific angular momentum. Major mergers have been shown to be able to destroy or highly perturb the disc components. More recently, the ali...

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Autores principales:	Pedrosa, S.E., Tissera, P.B., De Rossi, M.E.
Formato:	JOUR
Materias:	Galaxies: evolution Galaxies: formation Galaxies: structure Angular momentum Mergers and acquisitions Merging Morphology Supernovae Angular momentum orientation Complex Processes Dark matter halos Galaxies: evolutions Galaxy formations Hier-archical clustering Galaxies
Acceso en línea:	http://hdl.handle.net/20.500.12110/paper_00046361_v567_n_p_Pedrosa
Aporte de:	Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires

id	todo:paper_00046361_v567_n_p_Pedrosa
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spelling	todo:paper_00046361_v567_n_p_Pedrosa2023-10-03T14:00:51Z Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe Pedrosa, S.E. Tissera, P.B. De Rossi, M.E. Galaxies: evolution Galaxies: formation Galaxies: structure Angular momentum Mergers and acquisitions Merging Morphology Supernovae Angular momentum orientation Complex Processes Dark matter halos Galaxies: evolutions Galaxies: formation Galaxies: structure Galaxy formations Hier-archical clustering Galaxies Context. The standard disc formation scenario postulates that the disc forms as the gas cools and flows into the centre of the dark matter halo, conserving the specific angular momentum. Major mergers have been shown to be able to destroy or highly perturb the disc components. More recently, the alignment of the material that is accreted to form the galaxy has been pointed out as a key ingredient to determine galaxy morphology. However, in a hierarchical scenario galaxy formation is a complex process that combines these processes and others in a non-linear way so that the origin of galaxy morphology remains to be fully understood. Aims. We aim at exploring the differences in the formation histories of galaxies with a variety of morphologies, but quite recent merger histories, to identify which mechanisms are playing a major role. We analyse when minor mergers can be considered relevant to determine galaxy morphology. We also study the specific angular momentum content of the disc and central spheroidal components separately. Methods. We used cosmological hydrodynamical simulations that include an effective, physically motivated supernova feedback that is able to regulate the star formation in haloes of different masses. We analysed the morphology and formation history of a sample of 15 galaxies of a cosmological simulation. We performed a spheroid-disc decomposition of the selected galaxies and their progenitor systems. The angular momentum orientation of the merging systems as well as their relative masses were estimated to analyse the role played by orientation and by minor mergers in the determination of the morphology. Results. We found the discs to be formed by conserving the specific angular momentum in accordance with the classical disc formation model. The specific angular momentum of the stellar central spheroid correlates with the dark matter halo angular momentum and determines a power law. Our results suggest that gas accretion to rebuild the disc component is a necessary but not sufficient ingredient for a disc-dominated galaxy in a hierarchical clustering scenario. The survival of the discs is tightly linked to their subsequent history of accretion, as previously reported. Minor mergers play an important role. It is more likely that they will destroy the disc and feed the central spheroid if their angular momentum is misaligned with respect to that of the main galaxy. Conversely, if they are aligned, they can contribute to the disc formation. © ESO, 2014. Fil:Pedrosa, S.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:Tissera, P.B. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. Fil:De Rossi, M.E. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales; Argentina. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00046361_v567_n_p_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	Galaxies: evolution Galaxies: formation Galaxies: structure Angular momentum Mergers and acquisitions Merging Morphology Supernovae Angular momentum orientation Complex Processes Dark matter halos Galaxies: evolutions Galaxies: formation Galaxies: structure Galaxy formations Hier-archical clustering Galaxies
spellingShingle	Galaxies: evolution Galaxies: formation Galaxies: structure Angular momentum Mergers and acquisitions Merging Morphology Supernovae Angular momentum orientation Complex Processes Dark matter halos Galaxies: evolutions Galaxies: formation Galaxies: structure Galaxy formations Hier-archical clustering Galaxies Pedrosa, S.E. Tissera, P.B. De Rossi, M.E. Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe
topic_facet	Galaxies: evolution Galaxies: formation Galaxies: structure Angular momentum Mergers and acquisitions Merging Morphology Supernovae Angular momentum orientation Complex Processes Dark matter halos Galaxies: evolutions Galaxies: formation Galaxies: structure Galaxy formations Hier-archical clustering Galaxies
description	Context. The standard disc formation scenario postulates that the disc forms as the gas cools and flows into the centre of the dark matter halo, conserving the specific angular momentum. Major mergers have been shown to be able to destroy or highly perturb the disc components. More recently, the alignment of the material that is accreted to form the galaxy has been pointed out as a key ingredient to determine galaxy morphology. However, in a hierarchical scenario galaxy formation is a complex process that combines these processes and others in a non-linear way so that the origin of galaxy morphology remains to be fully understood. Aims. We aim at exploring the differences in the formation histories of galaxies with a variety of morphologies, but quite recent merger histories, to identify which mechanisms are playing a major role. We analyse when minor mergers can be considered relevant to determine galaxy morphology. We also study the specific angular momentum content of the disc and central spheroidal components separately. Methods. We used cosmological hydrodynamical simulations that include an effective, physically motivated supernova feedback that is able to regulate the star formation in haloes of different masses. We analysed the morphology and formation history of a sample of 15 galaxies of a cosmological simulation. We performed a spheroid-disc decomposition of the selected galaxies and their progenitor systems. The angular momentum orientation of the merging systems as well as their relative masses were estimated to analyse the role played by orientation and by minor mergers in the determination of the morphology. Results. We found the discs to be formed by conserving the specific angular momentum in accordance with the classical disc formation model. The specific angular momentum of the stellar central spheroid correlates with the dark matter halo angular momentum and determines a power law. Our results suggest that gas accretion to rebuild the disc component is a necessary but not sufficient ingredient for a disc-dominated galaxy in a hierarchical clustering scenario. The survival of the discs is tightly linked to their subsequent history of accretion, as previously reported. Minor mergers play an important role. It is more likely that they will destroy the disc and feed the central spheroid if their angular momentum is misaligned with respect to that of the main galaxy. Conversely, if they are aligned, they can contribute to the disc formation. © ESO, 2014.
format	JOUR
author	Pedrosa, S.E. Tissera, P.B. De Rossi, M.E.
author_facet	Pedrosa, S.E. Tissera, P.B. De Rossi, M.E.
author_sort	Pedrosa, S.E.
title	Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe
title_short	Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe
title_full	Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe
title_fullStr	Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe
title_full_unstemmed	Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe
title_sort	morphology of galaxies with quiescent recent assembly history in a λ-cdm universe
url	http://hdl.handle.net/20.500.12110/paper_00046361_v567_n_p_Pedrosa
work_keys_str_mv	AT pedrosase morphologyofgalaxieswithquiescentrecentassemblyhistoryinalcdmuniverse AT tisserapb morphologyofgalaxieswithquiescentrecentassemblyhistoryinalcdmuniverse AT derossime morphologyofgalaxieswithquiescentrecentassemblyhistoryinalcdmuniverse
_version_	1807320307063586816

Morphology of galaxies with quiescent recent assembly history in a Λ-CDM universe

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