Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge
- Autores
- Fragkoudi, F; Grand, R. J. J.; Pakmor, R; Blázquez Calero, G; Gargiulo, Ignacio Daniel; Gomez, F.; Marinacci, F.; Monachesi, A.; Ness, M. K.; Perez, I.; Tissera, Patricia Beatriz; White, S. D. M.
- Año de publicación
- 2020
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We explore the chemodynamical properties of a sample of barred galaxies in the Auriga magnetohydrodynamical cosmological zoom-in simulations, which form boxy/peanut (b/p) bulges, and compare these to the Milky Way (MW). We show that the Auriga galaxies which best reproduce the chemodynamical properties of stellar populations in the MW bulge have quiescent merger histories since redshift z ∼ 3.5: their last major merger occurs at tlookback > 12 Gyr, while subsequent mergers have a stellar mass ratio of ≤1:20, suggesting an upper limit of a few per cent for the mass ratio of the recently proposed Gaia Sausage/Enceladus merger. These Auriga MW-analogues have a negligible fraction of ex-situ stars in the b/p region (< 1 per cent), with flattened, thick disc-like metal-poor stellar populations. The average fraction of ex-situ stars in the central regions of all Auriga galaxies with b/p’s is 3 per cent – significantly lower than in those which do not host a b/p or a bar. While the central regions of these barred galaxies contain the oldest populations, they also have stars younger than 5 Gyr (>30 per cent) and exhibit X-shaped age and abundance distributions. Examining the discs in our sample, we find that in some cases a star-forming ring forms around the bar, which alters the metallicity of the inner regions of the galaxy. Further out in the disc, bar-induced resonances lead to metal-rich ridges in the Vφ − r plane – the longest of which is due to the Outer Lindblad Resonance. Our results suggest the Milky Way has an uncommonly quiet merger history, which leads to an essentially
Fil: Fragkoudi, F. Institut Max Planck Fur Astrophysics; Alemania
Fil: Grand, R. J. J.. Institut Max Planck Fur Astrophysics; Alemania
Fil: Pakmor, R. Institut Max Planck Fur Astrophysics; Alemania
Fil: Blázquez Calero, G. Departamento de Fisica Teorica y del Cosmos; España
Fil: Gargiulo, Ignacio Daniel. Universidad de La Serena; Chile
Fil: Gomez, F.. Universidad de La Serena; Chile
Fil: Marinacci, F.. University Of Bologna; Italia
Fil: Monachesi, A.. Universidad de La Serena; Chile
Fil: Ness, M. K.. Columbia University; Estados Unidos
Fil: Perez, I.. Departamento de Fisica Teorica y del Cosmos; España
Fil: Tissera, Patricia Beatriz. Departamento de Ciencias Fisicas, Universidad Andres Be; Chile
Fil: White, S. D. M.. Institut Max Planck Fur Astrophysics; Alemania - Materia
-
Galaxy: bulge
Galaxy: formation
Galaxy: evolution
galaxies: kinematics and dynamics - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
.jpg)
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/144131
Ver los metadatos del registro completo
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Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulgeFragkoudi, FGrand, R. J. J.Pakmor, RBlázquez Calero, GGargiulo, Ignacio DanielGomez, F.Marinacci, F.Monachesi, A.Ness, M. K.Perez, I.Tissera, Patricia BeatrizWhite, S. D. M.Galaxy: bulgeGalaxy: formationGalaxy: evolutiongalaxies: kinematics and dynamicshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1We explore the chemodynamical properties of a sample of barred galaxies in the Auriga magnetohydrodynamical cosmological zoom-in simulations, which form boxy/peanut (b/p) bulges, and compare these to the Milky Way (MW). We show that the Auriga galaxies which best reproduce the chemodynamical properties of stellar populations in the MW bulge have quiescent merger histories since redshift z ∼ 3.5: their last major merger occurs at tlookback > 12 Gyr, while subsequent mergers have a stellar mass ratio of ≤1:20, suggesting an upper limit of a few per cent for the mass ratio of the recently proposed Gaia Sausage/Enceladus merger. These Auriga MW-analogues have a negligible fraction of ex-situ stars in the b/p region (< 1 per cent), with flattened, thick disc-like metal-poor stellar populations. The average fraction of ex-situ stars in the central regions of all Auriga galaxies with b/p’s is 3 per cent – significantly lower than in those which do not host a b/p or a bar. While the central regions of these barred galaxies contain the oldest populations, they also have stars younger than 5 Gyr (>30 per cent) and exhibit X-shaped age and abundance distributions. Examining the discs in our sample, we find that in some cases a star-forming ring forms around the bar, which alters the metallicity of the inner regions of the galaxy. Further out in the disc, bar-induced resonances lead to metal-rich ridges in the Vφ − r plane – the longest of which is due to the Outer Lindblad Resonance. Our results suggest the Milky Way has an uncommonly quiet merger history, which leads to an essentiallyFil: Fragkoudi, F. Institut Max Planck Fur Astrophysics; AlemaniaFil: Grand, R. J. J.. Institut Max Planck Fur Astrophysics; AlemaniaFil: Pakmor, R. Institut Max Planck Fur Astrophysics; AlemaniaFil: Blázquez Calero, G. Departamento de Fisica Teorica y del Cosmos; EspañaFil: Gargiulo, Ignacio Daniel. Universidad de La Serena; ChileFil: Gomez, F.. Universidad de La Serena; ChileFil: Marinacci, F.. University Of Bologna; ItaliaFil: Monachesi, A.. Universidad de La Serena; ChileFil: Ness, M. K.. Columbia University; Estados UnidosFil: Perez, I.. Departamento de Fisica Teorica y del Cosmos; EspañaFil: Tissera, Patricia Beatriz. Departamento de Ciencias Fisicas, Universidad Andres Be; ChileFil: White, S. D. M.. Institut Max Planck Fur Astrophysics; AlemaniaWiley Blackwell Publishing, Inc2020-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/144131Fragkoudi, F; Grand, R. J. J.; Pakmor, R; Blázquez Calero, G; Gargiulo, Ignacio Daniel; et al.; Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 494; 4; 6-2020; 5936-59600035-8711CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/494/4/5936/5826816info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staa1104info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-10T13:14:28Zoai:ri.conicet.gov.ar:11336/144131instacron: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:34982025-09-10 13:14:28.569CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
| dc.title.none.fl_str_mv |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| title |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| spellingShingle |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge Fragkoudi, F Galaxy: bulge Galaxy: formation Galaxy: evolution galaxies: kinematics and dynamics |
| title_short |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| title_full |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| title_fullStr |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| title_full_unstemmed |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| title_sort |
Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge |
| dc.creator.none.fl_str_mv |
Fragkoudi, F Grand, R. J. J. Pakmor, R Blázquez Calero, G Gargiulo, Ignacio Daniel Gomez, F. Marinacci, F. Monachesi, A. Ness, M. K. Perez, I. Tissera, Patricia Beatriz White, S. D. M. |
| author |
Fragkoudi, F |
| author_facet |
Fragkoudi, F Grand, R. J. J. Pakmor, R Blázquez Calero, G Gargiulo, Ignacio Daniel Gomez, F. Marinacci, F. Monachesi, A. Ness, M. K. Perez, I. Tissera, Patricia Beatriz White, S. D. M. |
| author_role |
author |
| author2 |
Grand, R. J. J. Pakmor, R Blázquez Calero, G Gargiulo, Ignacio Daniel Gomez, F. Marinacci, F. Monachesi, A. Ness, M. K. Perez, I. Tissera, Patricia Beatriz White, S. D. M. |
| author2_role |
author author author author author author author author author author author |
| dc.subject.none.fl_str_mv |
Galaxy: bulge Galaxy: formation Galaxy: evolution galaxies: kinematics and dynamics |
| topic |
Galaxy: bulge Galaxy: formation Galaxy: evolution galaxies: kinematics and dynamics |
| purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| dc.description.none.fl_txt_mv |
We explore the chemodynamical properties of a sample of barred galaxies in the Auriga magnetohydrodynamical cosmological zoom-in simulations, which form boxy/peanut (b/p) bulges, and compare these to the Milky Way (MW). We show that the Auriga galaxies which best reproduce the chemodynamical properties of stellar populations in the MW bulge have quiescent merger histories since redshift z ∼ 3.5: their last major merger occurs at tlookback > 12 Gyr, while subsequent mergers have a stellar mass ratio of ≤1:20, suggesting an upper limit of a few per cent for the mass ratio of the recently proposed Gaia Sausage/Enceladus merger. These Auriga MW-analogues have a negligible fraction of ex-situ stars in the b/p region (< 1 per cent), with flattened, thick disc-like metal-poor stellar populations. The average fraction of ex-situ stars in the central regions of all Auriga galaxies with b/p’s is 3 per cent – significantly lower than in those which do not host a b/p or a bar. While the central regions of these barred galaxies contain the oldest populations, they also have stars younger than 5 Gyr (>30 per cent) and exhibit X-shaped age and abundance distributions. Examining the discs in our sample, we find that in some cases a star-forming ring forms around the bar, which alters the metallicity of the inner regions of the galaxy. Further out in the disc, bar-induced resonances lead to metal-rich ridges in the Vφ − r plane – the longest of which is due to the Outer Lindblad Resonance. Our results suggest the Milky Way has an uncommonly quiet merger history, which leads to an essentially Fil: Fragkoudi, F. Institut Max Planck Fur Astrophysics; Alemania Fil: Grand, R. J. J.. Institut Max Planck Fur Astrophysics; Alemania Fil: Pakmor, R. Institut Max Planck Fur Astrophysics; Alemania Fil: Blázquez Calero, G. Departamento de Fisica Teorica y del Cosmos; España Fil: Gargiulo, Ignacio Daniel. Universidad de La Serena; Chile Fil: Gomez, F.. Universidad de La Serena; Chile Fil: Marinacci, F.. University Of Bologna; Italia Fil: Monachesi, A.. Universidad de La Serena; Chile Fil: Ness, M. K.. Columbia University; Estados Unidos Fil: Perez, I.. Departamento de Fisica Teorica y del Cosmos; España Fil: Tissera, Patricia Beatriz. Departamento de Ciencias Fisicas, Universidad Andres Be; Chile Fil: White, S. D. M.. Institut Max Planck Fur Astrophysics; Alemania |
| description |
We explore the chemodynamical properties of a sample of barred galaxies in the Auriga magnetohydrodynamical cosmological zoom-in simulations, which form boxy/peanut (b/p) bulges, and compare these to the Milky Way (MW). We show that the Auriga galaxies which best reproduce the chemodynamical properties of stellar populations in the MW bulge have quiescent merger histories since redshift z ∼ 3.5: their last major merger occurs at tlookback > 12 Gyr, while subsequent mergers have a stellar mass ratio of ≤1:20, suggesting an upper limit of a few per cent for the mass ratio of the recently proposed Gaia Sausage/Enceladus merger. These Auriga MW-analogues have a negligible fraction of ex-situ stars in the b/p region (< 1 per cent), with flattened, thick disc-like metal-poor stellar populations. The average fraction of ex-situ stars in the central regions of all Auriga galaxies with b/p’s is 3 per cent – significantly lower than in those which do not host a b/p or a bar. While the central regions of these barred galaxies contain the oldest populations, they also have stars younger than 5 Gyr (>30 per cent) and exhibit X-shaped age and abundance distributions. Examining the discs in our sample, we find that in some cases a star-forming ring forms around the bar, which alters the metallicity of the inner regions of the galaxy. Further out in the disc, bar-induced resonances lead to metal-rich ridges in the Vφ − r plane – the longest of which is due to the Outer Lindblad Resonance. Our results suggest the Milky Way has an uncommonly quiet merger history, which leads to an essentially |
| publishDate |
2020 |
| dc.date.none.fl_str_mv |
2020-06 |
| 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/11336/144131 Fragkoudi, F; Grand, R. J. J.; Pakmor, R; Blázquez Calero, G; Gargiulo, Ignacio Daniel; et al.; Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 494; 4; 6-2020; 5936-5960 0035-8711 CONICET Digital CONICET |
| url |
http://hdl.handle.net/11336/144131 |
| identifier_str_mv |
Fragkoudi, F; Grand, R. J. J.; Pakmor, R; Blázquez Calero, G; Gargiulo, Ignacio Daniel; et al.; Chemodynamics of barred galaxies in cosmological simulations: On the Milky Way’s quiescent merger history and in-situ bulge; Wiley Blackwell Publishing, Inc; Monthly Notices of the Royal Astronomical Society; 494; 4; 6-2020; 5936-5960 0035-8711 CONICET Digital CONICET |
| dc.language.none.fl_str_mv |
eng |
| language |
eng |
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info:eu-repo/semantics/altIdentifier/url/https://academic.oup.com/mnras/article/494/4/5936/5826816 info:eu-repo/semantics/altIdentifier/doi/10.1093/mnras/staa1104 |
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info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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openAccess |
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https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
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application/pdf application/pdf |
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Wiley Blackwell Publishing, Inc |
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Wiley Blackwell Publishing, Inc |
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reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
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Consejo Nacional de Investigaciones Científicas y Técnicas |
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CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
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dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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