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Título:
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The morphologies of massive galaxies from z ~ 3-witnessing the two channels of bulge growth
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Autores:
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Huertas Company, M. ;
Pérez González, Pablo Guillermo ;
Mei, S. ;
Shankar, F. ;
Bernardi, M. ;
Daddi, E. ;
Barro, G. ;
Cabrera Vives, G. ;
Cattaneo, A. ;
Dimauro, P. ;
Gravet, R.
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Tipo de documento:
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texto impreso
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Editorial:
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American Astronomical Society, 2015-08-10
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Materia = Ciencias: Física: Astronomía
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Tipo = Artículo
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Resumen:
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We quantify the morphological evolution of z ~ 0 massive galaxies (M_*/M_? ?10^11.2 +/- 0.3) from z ~ 3 in the 5 CANDELS fields. The progenitors are selected using abundance matching techniques to account for the mass growth. At z 3-4), and small effective radii (R_e ?1 kpc), pointing toward an even earlier formation through gas-rich mergers or violent disk instabilities. Between z ~ 2.5 and z ~ 0, they rapidly increase their size by a factor of ~ 4-5, are quenched, and slightly increase their Sersic indices (n ~ 5) but their global morphology remains unaltered. The structural evolution is independent of the gas fractions, suggesting that it is driven by ex situ events. The remaining 60% experience a gradual morphological transformation, from clumpy disks to more regular bulge +disk systems, essentially happening at z > 1. This results in the growth of a significant bulge component (n ~ 3) for 2/3 of the systems, possibly through the migration of clumps, while the remaining 1/3 retain a rather small bulge (n ~ 1.5-2). The transition phase between disturbed and relaxed systems and the emergence of the bulge is correlated with a decrease in the star formation activity and the gas fractions, suggesting a morphological quenching process as a plausible mechanism for the formation of these bulges.
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En línea:
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https://eprints.ucm.es/33794/1/perezgonzalez153libre.pdf
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