Artículo
The age structure of the Milky Way's halo
Carollo, D.; Beers, T. C.; Placco, V. M.; Santucci, R. M.; Denissenkov, P.; Tissera, Patricia Beatriz
; Lentner, G.; Rossi, S.; Lee, Y. S.; Tumlinson, J.
![Icon](/themes/CONICETDigital/images/conicet.png)
Fecha de publicación:
12/2016
Editorial:
Nature Publishing Group
Revista:
Nature Physics
ISSN:
1745-2473
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We present a new, high-resolution chronographic (age) map of the Milky Way´s halo, based on the inferred ages of ∼130,000 field blue horizontal-branch (BHB) stars with photometry from the Sloan Digital Sky Survey. Our map exhibits a strong central concentration of BHB stars with ages greater than 12 Gyr, extending up to ∼15 kpc from the Galactic Centre (reaching close to the solar vicinity), and a decrease in the mean ages of field stars with distance by 1-1.5 Gyr out to ∼45-50 kpc, along with an apparent increase of the dispersion of stellar ages, and numerous known (and previously unknown) resolved over-densities and debris streams, including the Sagittarius Stream. These results agree with expectations from modern lambda cold dark matter cosmological simulations, and support the existence of a dual (inner/outer) halo system, punctuated by the presence of over-densities and debris streams that have not yet completely phase-space mixed.
Palabras clave:
Milky Way
,
Galaxy Formation
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Articulos(IAFE)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Articulos de INST.DE ASTRONOMIA Y FISICA DEL ESPACIO(I)
Citación
Carollo, D.; Beers, T. C.; Placco, V. M.; Santucci, R. M.; Denissenkov, P.; et al.; The age structure of the Milky Way's halo; Nature Publishing Group; Nature Physics; 12; 12; 12-2016; 1170-1176
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