A duality in the origin of bulges and spheroidal galaxies
Studying the resolved stellar populations of the different structural components which build massive galaxies directly unveils their assembly history. We aim at characterizing the stellar population properties of a representative sample of bulges and pure spheroids in massive galaxies (M* > 10^(1...
| Autores: | , , , , , , , , , , , , , |
|---|---|
| Tipo de recurso: | artículo |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/8440 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/8440 |
| Access Level: | acceso abierto |
| Palabra clave: | 52 Star-formation histories Massive quiescent galaxies Post-starburst galxies High-redshift Stellar populatins size evolution Photometric redshifts Disk galaxies Structural-properties Elliptic galaxies Astrofísica Astronomía (Física) |
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A duality in the origin of bulges and spheroidal galaxiesCostantin, LucaPérez González, Pablo GuillermoMéndez Abreu, JairoHuertas Company, MarcDimauro, PaolaAlcalde Pampliega, BelénBuitrago, FernandoCeverino, DanielDaddi, EmanueleDomínguez Sánchez, HelenaEspino Briones, NéstorHernán Caballero, AntonioKoekemoer, Anton M.Rodighiero, Giulia52Star-formation historiesMassive quiescent galaxiesPost-starburst galxiesHigh-redshiftStellar populatinssize evolutionPhotometric redshiftsDisk galaxiesStructural-propertiesElliptic galaxiesAstrofísicaAstronomía (Física)Studying the resolved stellar populations of the different structural components which build massive galaxies directly unveils their assembly history. We aim at characterizing the stellar population properties of a representative sample of bulges and pure spheroids in massive galaxies (M* > 10^(10) Mסּ ) in the GOODS-N field. We take advantage of the spectral and spatial information provided by SHARDS and HST data to perform the multi-image spectro-photometrical decoupling of the galaxy light. We derive the spectral energy distribution separately for bulges and disks in the redshift range 0.14 < z ≤1 with spectral resolution R ∼50. Analyzing these SEDs, we find evidences of a bimodal distribution of bulge formation redshifts. We find that 33% of them present old mass-weighted ages, implying a median formation redshift z_(form) = 6.2^(+1.5)_(−1.7). They are relics of the early Universe embedded in disk galaxies. A second wave, dominant in number, accounts for bulges formed at median redshift z_(form) = 1.3^(+0.6)_(−0.6). The oldest (1st-wave) bulges are more compact than the youngest. Virtually all pure spheroids (i.e., those without any disk) are coetaneous with the 2nd-wave bulges, presenting a median redshift of formation z_(form) = 1.1^(+0.3)_(−0.3). The two waves of bulge formation are not only distinguishable in terms of stellar ages, but also in star formation mode. All 1st-wave bulges formed fast at z ∼ 6, with typical timescales around 200 Myr. A significant fraction of the 2nd-wave bulges assembled more slowly, with star formation timescales as long as 1 Gyr. The results of this work suggest that the centers of massive disk-like galaxies actually harbor the oldest spheroids formed in the Universe.IOP PublishingUniversidad Complutense de Madrid20212021-06-0120212021-06-01journal articlehttp://purl.org/coar/resource_type/c_6501info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/20.500.14352/8440reponame:Docta Complutenseinstname:Universidad Complutense de Madrid (UCM)Inglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:docta.ucm.es:20.500.14352/84402026-06-02T12:44:21Z |
| dc.title.none.fl_str_mv |
A duality in the origin of bulges and spheroidal galaxies |
| title |
A duality in the origin of bulges and spheroidal galaxies |
| spellingShingle |
A duality in the origin of bulges and spheroidal galaxies Costantin, Luca 52 Star-formation histories Massive quiescent galaxies Post-starburst galxies High-redshift Stellar populatins size evolution Photometric redshifts Disk galaxies Structural-properties Elliptic galaxies Astrofísica Astronomía (Física) |
| title_short |
A duality in the origin of bulges and spheroidal galaxies |
| title_full |
A duality in the origin of bulges and spheroidal galaxies |
| title_fullStr |
A duality in the origin of bulges and spheroidal galaxies |
| title_full_unstemmed |
A duality in the origin of bulges and spheroidal galaxies |
| title_sort |
A duality in the origin of bulges and spheroidal galaxies |
| dc.creator.none.fl_str_mv |
Costantin, Luca Pérez González, Pablo Guillermo Méndez Abreu, Jairo Huertas Company, Marc Dimauro, Paola Alcalde Pampliega, Belén Buitrago, Fernando Ceverino, Daniel Daddi, Emanuele Domínguez Sánchez, Helena Espino Briones, Néstor Hernán Caballero, Antonio Koekemoer, Anton M. Rodighiero, Giulia |
| author |
Costantin, Luca |
| author_facet |
Costantin, Luca Pérez González, Pablo Guillermo Méndez Abreu, Jairo Huertas Company, Marc Dimauro, Paola Alcalde Pampliega, Belén Buitrago, Fernando Ceverino, Daniel Daddi, Emanuele Domínguez Sánchez, Helena Espino Briones, Néstor Hernán Caballero, Antonio Koekemoer, Anton M. Rodighiero, Giulia |
| author_role |
author |
| author2 |
Pérez González, Pablo Guillermo Méndez Abreu, Jairo Huertas Company, Marc Dimauro, Paola Alcalde Pampliega, Belén Buitrago, Fernando Ceverino, Daniel Daddi, Emanuele Domínguez Sánchez, Helena Espino Briones, Néstor Hernán Caballero, Antonio Koekemoer, Anton M. Rodighiero, Giulia |
| author2_role |
author author author author author author author author author author author author author |
| dc.contributor.none.fl_str_mv |
Universidad Complutense de Madrid |
| dc.subject.none.fl_str_mv |
52 Star-formation histories Massive quiescent galaxies Post-starburst galxies High-redshift Stellar populatins size evolution Photometric redshifts Disk galaxies Structural-properties Elliptic galaxies Astrofísica Astronomía (Física) |
| topic |
52 Star-formation histories Massive quiescent galaxies Post-starburst galxies High-redshift Stellar populatins size evolution Photometric redshifts Disk galaxies Structural-properties Elliptic galaxies Astrofísica Astronomía (Física) |
| description |
Studying the resolved stellar populations of the different structural components which build massive galaxies directly unveils their assembly history. We aim at characterizing the stellar population properties of a representative sample of bulges and pure spheroids in massive galaxies (M* > 10^(10) Mסּ ) in the GOODS-N field. We take advantage of the spectral and spatial information provided by SHARDS and HST data to perform the multi-image spectro-photometrical decoupling of the galaxy light. We derive the spectral energy distribution separately for bulges and disks in the redshift range 0.14 < z ≤1 with spectral resolution R ∼50. Analyzing these SEDs, we find evidences of a bimodal distribution of bulge formation redshifts. We find that 33% of them present old mass-weighted ages, implying a median formation redshift z_(form) = 6.2^(+1.5)_(−1.7). They are relics of the early Universe embedded in disk galaxies. A second wave, dominant in number, accounts for bulges formed at median redshift z_(form) = 1.3^(+0.6)_(−0.6). The oldest (1st-wave) bulges are more compact than the youngest. Virtually all pure spheroids (i.e., those without any disk) are coetaneous with the 2nd-wave bulges, presenting a median redshift of formation z_(form) = 1.1^(+0.3)_(−0.3). The two waves of bulge formation are not only distinguishable in terms of stellar ages, but also in star formation mode. All 1st-wave bulges formed fast at z ∼ 6, with typical timescales around 200 Myr. A significant fraction of the 2nd-wave bulges assembled more slowly, with star formation timescales as long as 1 Gyr. The results of this work suggest that the centers of massive disk-like galaxies actually harbor the oldest spheroids formed in the Universe. |
| publishDate |
2021 |
| dc.date.none.fl_str_mv |
2021 2021-06-01 2021 2021-06-01 |
| dc.type.none.fl_str_mv |
journal article http://purl.org/coar/resource_type/c_6501 |
| dc.type.openaire.fl_str_mv |
info:eu-repo/semantics/article |
| format |
article |
| dc.identifier.none.fl_str_mv |
https://hdl.handle.net/20.500.14352/8440 |
| url |
https://hdl.handle.net/20.500.14352/8440 |
| dc.language.none.fl_str_mv |
Inglés eng |
| language_invalid_str_mv |
Inglés |
| language |
eng |
| dc.rights.none.fl_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| dc.rights.openaire.fl_str_mv |
info:eu-repo/semantics/openAccess |
| rights_invalid_str_mv |
open access http://purl.org/coar/access_right/c_abf2 |
| eu_rights_str_mv |
openAccess |
| dc.format.none.fl_str_mv |
application/pdf |
| dc.publisher.none.fl_str_mv |
IOP Publishing |
| publisher.none.fl_str_mv |
IOP Publishing |
| dc.source.none.fl_str_mv |
reponame:Docta Complutense instname:Universidad Complutense de Madrid (UCM) |
| instname_str |
Universidad Complutense de Madrid (UCM) |
| reponame_str |
Docta Complutense |
| collection |
Docta Complutense |
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|
| repository.mail.fl_str_mv |
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1869415039578931200 |
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15,301603 |