A duality in the origin of bulges and spheroidal galaxies
Author
Costantin, Luca; Pérez-González, Pablo G.; Méndez-Abreu, Jairo; Huertas-Company, Marc; Dimauro, Paola; Alcalde-Pampliega, Belén; Buitrago, Fernando; Ceverino Rodríguez, Daniel; Daddi, Emanuele; Domínguez-Sánchez, Helena; Espino-Briones, Néstor; Hernán-Caballero, Antonio; Koekemoer, Anton M.; Rodighiero, GiuliaEntity
UAM. Departamento de Física TeóricaPublisher
American Astronomical SocietyDate
2021-06-01Citation
10.3847/1538-4357/abef72
The Astrophysical Journal 913.2 (2021): 125
ISSN
0004-637X (print); 1538-4357 (online)DOI
10.3847/1538-4357/abef72Funded by
LC and PGPG acknowledge support from Spanish Ministerio de Ciencia, Innovación y Universidades through grant PGC2018-093499-B-I00. JMA acknowledges support from the MCIU by the grant AYA2017- 83204-P and the Programa Operativo FEDER Andalucía 2014-2020 in collaboration with the Andalucian Office for Economy and Knowledge. DC is a Ramón Cajal Researcher and is supported by the Ministerio de Ciencia, Innovación y Universidades (MICIU/FEDER) under research grant PGC2018-094975-C21. This work has made use of the Rainbow Cosmological Surveys Database, which is operated by the Centro de Astrobiología (CAB/INTA), partnered with the University of California Observatories at Santa Cruz (UCO/Lick,UCSC)Project
Gobierno de España. PGC2018-093499-B-I00; Gobierno de España. AYA2017-83204-P; Gobierno de España. PGC2018-094975-C21Editor's Version
https://doi.org/10.3847/1538-4357/abef72Subjects
Galaxies: bulge; Galaxies: evolution; Galaxies: formation; Galaxies: photometry; Galaxies: stellar content; Galaxies: structure; FísicaRights
© 2021 The American Astronomical SocietyAbstract
Studying the resolved stellar populations of the different structural components that 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 ∗ > 1010 M ⊙) in the GOODS-N field. We take advantage of the spectral and spatial information provided by SHARDS and Hubble Space Telescope data to perform the multi-image spectrophotometric 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 evidence of a bimodal distribution of bulge formation redshifts. We find that 33% of them present old mass-weighted ages, implying a median formation redshift zform = 6.2 -1.7 +1.5. They are relics of the early Universe embedded in disk galaxies. A second wave, dominant in number, accounts for bulges formed at median redshift zform = 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 zform = 1.1 -0.3 +0.3 The two waves of bulge formation are distinguishable not only 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
Files in this item
Google Scholar:Costantin, Luca
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Pérez-González, Pablo G.
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Méndez-Abreu, Jairo
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Huertas-Company, Marc
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Dimauro, Paola
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Alcalde-Pampliega, Belén
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Buitrago, Fernando
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Ceverino Rodríguez, Daniel
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Daddi, Emanuele
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Domínguez-Sánchez, Helena
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Espino-Briones, Néstor
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Hernán-Caballero, Antonio
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Koekemoer, Anton M.
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Rodighiero, Giulia
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