Mergers and the outside-in formation of dwarf spheroidals

Autores
Benítez Llambay, Alejandro; Navarro, J. F.; Abadi, Mario Gabriel; Gottlöber, S.; Yepes, G.; Hoffman, Y.; Steinmetz, M.
Año de publicación
2016
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We use a cosmological simulation of the formation of the Local Group to explore the origin of age and metallicity gradients in dwarf spheroidal galaxies.We find that a number of simulated dwarfs form 'outside-in', with an old, metal-poor population that surrounds a younger, more concentrated metal-rich component, reminiscent of dwarf spheroidals like Sculptor or Sextans. We focus on a few examples where stars form in two populations distinct in age in order to elucidate the origin of these gradients. The spatial distributions of the two components reflect their diverse origin; the old stellar component is assembled through mergers, but the young population forms largely in situ. The older component results from a first episode of star formation that begins early but is quickly shut off by the combined effects of stellar feedback and reionization. The younger component forms when a late accretion event adds gas and reignites star formation. The effect of mergers is to disperse the old stellar population, increasing their radius and decreasing their central density relative to the young population. We argue that dwarf-dwarf mergers offer a plausible scenario for the formation of systems with multiple distinct populations and, more generally, for the origin of age and metallicity gradients in dwarf spheroidals.
Fil: Benítez Llambay, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Navarro, J. F.. University of Victoria; Canadá
Fil: Abadi, Mario Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Gottlöber, S.. Leibniz Institute For Astrophysics Potsdam; Alemania
Fil: Yepes, G.. Universidad Autónoma de Madrid; España
Fil: Hoffman, Y.. The Hebrew University of Jerusalem; Israel
Fil: Steinmetz, M.. Leibniz Institute For Astrophysics Potsdam; Alemania
Materia
DARK AGES, REIONIZATION, FIRST STARS
GALAXIES: DWARF
GALAXIES: EVOLUTION
GALAXIES: FORMATION
GALAXIES: STELLAR CONTENT
LOCAL GROUP
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:11336/190632
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/190632
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Mergers and the outside-in formation of dwarf spheroidalsBenítez Llambay, AlejandroNavarro, J. F.Abadi, Mario GabrielGottlöber, S.Yepes, G.Hoffman, Y.Steinmetz, M.DARK AGES, REIONIZATION, FIRST STARSGALAXIES: DWARFGALAXIES: EVOLUTIONGALAXIES: FORMATIONGALAXIES: STELLAR CONTENTLOCAL GROUPhttps://purl.org/becyt/ford/1.7https://purl.org/becyt/ford/1We use a cosmological simulation of the formation of the Local Group to explore the origin of age and metallicity gradients in dwarf spheroidal galaxies.We find that a number of simulated dwarfs form 'outside-in', with an old, metal-poor population that surrounds a younger, more concentrated metal-rich component, reminiscent of dwarf spheroidals like Sculptor or Sextans. We focus on a few examples where stars form in two populations distinct in age in order to elucidate the origin of these gradients. The spatial distributions of the two components reflect their diverse origin; the old stellar component is assembled through mergers, but the young population forms largely in situ. The older component results from a first episode of star formation that begins early but is quickly shut off by the combined effects of stellar feedback and reionization. The younger component forms when a late accretion event adds gas and reignites star formation. The effect of mergers is to disperse the old stellar population, increasing their radius and decreasing their central density relative to the young population. We argue that dwarf-dwarf mergers offer a plausible scenario for the formation of systems with multiple distinct populations and, more generally, for the origin of age and metallicity gradients in dwarf spheroidals.Fil: Benítez Llambay, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Navarro, J. F.. University of Victoria; CanadáFil: Abadi, Mario Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; ArgentinaFil: Gottlöber, S.. Leibniz Institute For Astrophysics Potsdam; AlemaniaFil: Yepes, G.. Universidad Autónoma de Madrid; EspañaFil: Hoffman, Y.. The Hebrew University of Jerusalem; IsraelFil: Steinmetz, M.. Leibniz Institute For Astrophysics Potsdam; AlemaniaWiley Blackwell Publishing, Inc2016-02info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/190632Benítez Llambay, Alejandro; Navarro, J. F.; Abadi, Mario Gabriel; Gottlöber, S.; Yepes, G.; et al.; Mergers and the outside-in formation of dwarf spheroidals; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 456; 2; 2-2016; 1185-11940035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/http://arxiv.org/abs/1511.06188info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/456/2/1185/1063527info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stv2722info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-11-05T10:41:32Zoai:ri.conicet.gov.ar:11336/190632instacron: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:34982025-11-05 10:41:33.139CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Mergers and the outside-in formation of dwarf spheroidals
title Mergers and the outside-in formation of dwarf spheroidals
spellingShingle Mergers and the outside-in formation of dwarf spheroidals
Benítez Llambay, Alejandro
DARK AGES, REIONIZATION, FIRST STARS
GALAXIES: DWARF
GALAXIES: EVOLUTION
GALAXIES: FORMATION
GALAXIES: STELLAR CONTENT
LOCAL GROUP
title_short Mergers and the outside-in formation of dwarf spheroidals
title_full Mergers and the outside-in formation of dwarf spheroidals
title_fullStr Mergers and the outside-in formation of dwarf spheroidals
title_full_unstemmed Mergers and the outside-in formation of dwarf spheroidals
title_sort Mergers and the outside-in formation of dwarf spheroidals
dc.creator.none.fl_str_mv Benítez Llambay, Alejandro
Navarro, J. F.
Abadi, Mario Gabriel
Gottlöber, S.
Yepes, G.
Hoffman, Y.
Steinmetz, M.
author Benítez Llambay, Alejandro
author_facet Benítez Llambay, Alejandro
Navarro, J. F.
Abadi, Mario Gabriel
Gottlöber, S.
Yepes, G.
Hoffman, Y.
Steinmetz, M.
author_role author
author2 Navarro, J. F.
Abadi, Mario Gabriel
Gottlöber, S.
Yepes, G.
Hoffman, Y.
Steinmetz, M.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv DARK AGES, REIONIZATION, FIRST STARS
GALAXIES: DWARF
GALAXIES: EVOLUTION
GALAXIES: FORMATION
GALAXIES: STELLAR CONTENT
LOCAL GROUP
topic DARK AGES, REIONIZATION, FIRST STARS
GALAXIES: DWARF
GALAXIES: EVOLUTION
GALAXIES: FORMATION
GALAXIES: STELLAR CONTENT
LOCAL GROUP
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.7
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv We use a cosmological simulation of the formation of the Local Group to explore the origin of age and metallicity gradients in dwarf spheroidal galaxies.We find that a number of simulated dwarfs form 'outside-in', with an old, metal-poor population that surrounds a younger, more concentrated metal-rich component, reminiscent of dwarf spheroidals like Sculptor or Sextans. We focus on a few examples where stars form in two populations distinct in age in order to elucidate the origin of these gradients. The spatial distributions of the two components reflect their diverse origin; the old stellar component is assembled through mergers, but the young population forms largely in situ. The older component results from a first episode of star formation that begins early but is quickly shut off by the combined effects of stellar feedback and reionization. The younger component forms when a late accretion event adds gas and reignites star formation. The effect of mergers is to disperse the old stellar population, increasing their radius and decreasing their central density relative to the young population. We argue that dwarf-dwarf mergers offer a plausible scenario for the formation of systems with multiple distinct populations and, more generally, for the origin of age and metallicity gradients in dwarf spheroidals.
Fil: Benítez Llambay, Alejandro. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Navarro, J. F.. University of Victoria; Canadá
Fil: Abadi, Mario Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Astronomía Teórica y Experimental. Universidad Nacional de Córdoba. Observatorio Astronómico de Córdoba. Instituto de Astronomía Teórica y Experimental; Argentina
Fil: Gottlöber, S.. Leibniz Institute For Astrophysics Potsdam; Alemania
Fil: Yepes, G.. Universidad Autónoma de Madrid; España
Fil: Hoffman, Y.. The Hebrew University of Jerusalem; Israel
Fil: Steinmetz, M.. Leibniz Institute For Astrophysics Potsdam; Alemania
description We use a cosmological simulation of the formation of the Local Group to explore the origin of age and metallicity gradients in dwarf spheroidal galaxies.We find that a number of simulated dwarfs form 'outside-in', with an old, metal-poor population that surrounds a younger, more concentrated metal-rich component, reminiscent of dwarf spheroidals like Sculptor or Sextans. We focus on a few examples where stars form in two populations distinct in age in order to elucidate the origin of these gradients. The spatial distributions of the two components reflect their diverse origin; the old stellar component is assembled through mergers, but the young population forms largely in situ. The older component results from a first episode of star formation that begins early but is quickly shut off by the combined effects of stellar feedback and reionization. The younger component forms when a late accretion event adds gas and reignites star formation. The effect of mergers is to disperse the old stellar population, increasing their radius and decreasing their central density relative to the young population. We argue that dwarf-dwarf mergers offer a plausible scenario for the formation of systems with multiple distinct populations and, more generally, for the origin of age and metallicity gradients in dwarf spheroidals.
publishDate 2016
dc.date.none.fl_str_mv 2016-02
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/11336/190632
Benítez Llambay, Alejandro; Navarro, J. F.; Abadi, Mario Gabriel; Gottlöber, S.; Yepes, G.; et al.; Mergers and the outside-in formation of dwarf spheroidals; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 456; 2; 2-2016; 1185-1194
0035-8711
CONICET Digital
CONICET
url http://hdl.handle.net/11336/190632
identifier_str_mv Benítez Llambay, Alejandro; Navarro, J. F.; Abadi, Mario Gabriel; Gottlöber, S.; Yepes, G.; et al.; Mergers and the outside-in formation of dwarf spheroidals; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 456; 2; 2-2016; 1185-1194
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/url/http://arxiv.org/abs/1511.06188
info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/456/2/1185/1063527
info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/stv2722
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_ 1847978111994429440
score 13.121305

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