Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes

Autores
Ortega-Martinez, Sara; Obreja, Aura; Dominguez Tenreiro, Rosa; Pedrosa, Susana Elizabeth; Rosas Guevara, Yetli; Tissera, Patricia Beatriz
Año de publicación
2022
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervised Gaussian Mixture model of galactic structure finder to extract the components of a sub-sample of galaxies with Milky Way-like masses from the eagle simulations. A clustering in the space of first- and second-order dynamical moments of all identified substructures reveals five types of galaxy components: thin and thick discs, stellar haloes, bulges and spheroids. We analyse the dynamical, morphological and stellar population (SP) properties of these five component types, exploring to what extent these properties correlate with each other, and how much they depend on the total galaxy stellar and dark matter halo masses. All galaxies contain a bulge, a stellar halo and a disc. In total, 60 per cent of objects host two discs (thin and thick), and 68 per cent host also a spheroid. The dynamical disc-to-total ratio does not depend on stellar mass, but the median rotational velocities of the two discs do. Thin discs are well separated in stellar ages, [Fe/H] and α-enhancement from the three dispersion-dominated components, while thick discs are in between. Except for thin discs, all components show correlations among their SP properties: older ages mean lower metallicities and larger α-enhancement. Finally, we quantify the weak dependence of SP properties on each component's dynamics.
Fil: Ortega-Martinez, Sara. Universidad Autónoma de Madrid; España
Fil: Obreja, Aura. Technische Universitat München; Alemania
Fil: Dominguez Tenreiro, Rosa. Universidad Autónoma de Madrid; España
Fil: Pedrosa, Susana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Rosas Guevara, Yetli. Donostia International Physic Center (dipc);
Fil: Tissera, Patricia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Pontificia Universidad Católica de Chile; Chile
Materia
GALAXIES: KINEMATICS AND DYNAMICS
GALAXIES: STATISTICS
GALAXIES: STELLAR CONTENT
GALAXIES: STRUCTURE
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/217273
Acceder
id CONICETDig_faa14d767d4b7833ddf73448328a3de6
oai_identifier_str oai:ri.conicet.gov.ar:11336/217273
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloesOrtega-Martinez, SaraObreja, AuraDominguez Tenreiro, RosaPedrosa, Susana ElizabethRosas Guevara, YetliTissera, Patricia BeatrizGALAXIES: KINEMATICS AND DYNAMICSGALAXIES: STATISTICSGALAXIES: STELLAR CONTENTGALAXIES: STRUCTUREhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervised Gaussian Mixture model of galactic structure finder to extract the components of a sub-sample of galaxies with Milky Way-like masses from the eagle simulations. A clustering in the space of first- and second-order dynamical moments of all identified substructures reveals five types of galaxy components: thin and thick discs, stellar haloes, bulges and spheroids. We analyse the dynamical, morphological and stellar population (SP) properties of these five component types, exploring to what extent these properties correlate with each other, and how much they depend on the total galaxy stellar and dark matter halo masses. All galaxies contain a bulge, a stellar halo and a disc. In total, 60 per cent of objects host two discs (thin and thick), and 68 per cent host also a spheroid. The dynamical disc-to-total ratio does not depend on stellar mass, but the median rotational velocities of the two discs do. Thin discs are well separated in stellar ages, [Fe/H] and α-enhancement from the three dispersion-dominated components, while thick discs are in between. Except for thin discs, all components show correlations among their SP properties: older ages mean lower metallicities and larger α-enhancement. Finally, we quantify the weak dependence of SP properties on each component's dynamics.Fil: Ortega-Martinez, Sara. Universidad Autónoma de Madrid; EspañaFil: Obreja, Aura. Technische Universitat München; AlemaniaFil: Dominguez Tenreiro, Rosa. Universidad Autónoma de Madrid; EspañaFil: Pedrosa, Susana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; ArgentinaFil: Rosas Guevara, Yetli. Donostia International Physic Center (dipc);Fil: Tissera, Patricia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Pontificia Universidad Católica de Chile; ChileWiley Blackwell Publishing, Inc2022-07info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/217273Ortega-Martinez, Sara; Obreja, Aura; Dominguez Tenreiro, Rosa; Pedrosa, Susana Elizabeth; Rosas Guevara, Yetli; et al.; Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 516; 1; 7-2022; 197-2150035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stac2033info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:11:19Zoai:ri.conicet.gov.ar:11336/217273instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:11:19.785CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
title Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
spellingShingle Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
Ortega-Martinez, Sara
GALAXIES: KINEMATICS AND DYNAMICS
GALAXIES: STATISTICS
GALAXIES: STELLAR CONTENT
GALAXIES: STRUCTURE
title_short Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
title_full Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
title_fullStr Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
title_full_unstemmed Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
title_sort Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes
dc.creator.none.fl_str_mv Ortega-Martinez, Sara
Obreja, Aura
Dominguez Tenreiro, Rosa
Pedrosa, Susana Elizabeth
Rosas Guevara, Yetli
Tissera, Patricia Beatriz
author Ortega-Martinez, Sara
author_facet Ortega-Martinez, Sara
Obreja, Aura
Dominguez Tenreiro, Rosa
Pedrosa, Susana Elizabeth
Rosas Guevara, Yetli
Tissera, Patricia Beatriz
author_role author
author2 Obreja, Aura
Dominguez Tenreiro, Rosa
Pedrosa, Susana Elizabeth
Rosas Guevara, Yetli
Tissera, Patricia Beatriz
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv GALAXIES: KINEMATICS AND DYNAMICS
GALAXIES: STATISTICS
GALAXIES: STELLAR CONTENT
GALAXIES: STRUCTURE
topic GALAXIES: KINEMATICS AND DYNAMICS
GALAXIES: STATISTICS
GALAXIES: STELLAR CONTENT
GALAXIES: STRUCTURE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervised Gaussian Mixture model of galactic structure finder to extract the components of a sub-sample of galaxies with Milky Way-like masses from the eagle simulations. A clustering in the space of first- and second-order dynamical moments of all identified substructures reveals five types of galaxy components: thin and thick discs, stellar haloes, bulges and spheroids. We analyse the dynamical, morphological and stellar population (SP) properties of these five component types, exploring to what extent these properties correlate with each other, and how much they depend on the total galaxy stellar and dark matter halo masses. All galaxies contain a bulge, a stellar halo and a disc. In total, 60 per cent of objects host two discs (thin and thick), and 68 per cent host also a spheroid. The dynamical disc-to-total ratio does not depend on stellar mass, but the median rotational velocities of the two discs do. Thin discs are well separated in stellar ages, [Fe/H] and α-enhancement from the three dispersion-dominated components, while thick discs are in between. Except for thin discs, all components show correlations among their SP properties: older ages mean lower metallicities and larger α-enhancement. Finally, we quantify the weak dependence of SP properties on each component's dynamics.
Fil: Ortega-Martinez, Sara. Universidad Autónoma de Madrid; España
Fil: Obreja, Aura. Technische Universitat München; Alemania
Fil: Dominguez Tenreiro, Rosa. Universidad Autónoma de Madrid; España
Fil: Pedrosa, Susana Elizabeth. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina
Fil: Rosas Guevara, Yetli. Donostia International Physic Center (dipc);
Fil: Tissera, Patricia Beatriz. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina. Pontificia Universidad Católica de Chile; Chile
description The formation of galaxies can be understood in terms of the assembly patterns of each type of galactic component. To perform this kind of analysis, it is necessary to define some criteria to separate those components. Decomposition methods based on dynamical properties are more physically motivated than photometry-based ones. We use the unsupervised Gaussian Mixture model of galactic structure finder to extract the components of a sub-sample of galaxies with Milky Way-like masses from the eagle simulations. A clustering in the space of first- and second-order dynamical moments of all identified substructures reveals five types of galaxy components: thin and thick discs, stellar haloes, bulges and spheroids. We analyse the dynamical, morphological and stellar population (SP) properties of these five component types, exploring to what extent these properties correlate with each other, and how much they depend on the total galaxy stellar and dark matter halo masses. All galaxies contain a bulge, a stellar halo and a disc. In total, 60 per cent of objects host two discs (thin and thick), and 68 per cent host also a spheroid. The dynamical disc-to-total ratio does not depend on stellar mass, but the median rotational velocities of the two discs do. Thin discs are well separated in stellar ages, [Fe/H] and α-enhancement from the three dispersion-dominated components, while thick discs are in between. Except for thin discs, all components show correlations among their SP properties: older ages mean lower metallicities and larger α-enhancement. Finally, we quantify the weak dependence of SP properties on each component's dynamics.
publishDate 2022
dc.date.none.fl_str_mv 2022-07
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/217273
Ortega-Martinez, Sara; Obreja, Aura; Dominguez Tenreiro, Rosa; Pedrosa, Susana Elizabeth; Rosas Guevara, Yetli; et al.; Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 516; 1; 7-2022; 197-215
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/217273
identifier_str_mv Ortega-Martinez, Sara; Obreja, Aura; Dominguez Tenreiro, Rosa; Pedrosa, Susana Elizabeth; Rosas Guevara, Yetli; et al.; Milky Way-like galaxies: stellar population properties of dynamically defined discs, bulges and stellar haloes; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 516; 1; 7-2022; 197-215
0035-8711
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stac2033
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
publisher.none.fl_str_mv Wiley Blackwell Publishing, Inc
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
_version_ 1844614011269677056
score 13.070432

Publicaciones similares