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dc.contributor.author
Carollo, D.  
dc.contributor.author
Beers, T. C.  
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Placco, V. M.  
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Santucci, R. M.  
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Denissenkov, P.  
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Tissera, Patricia Beatriz  
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Lentner, G.  
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Rossi, S.  
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Lee, Y. S.  
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Tumlinson, J.  
dc.date.available
2017-09-04T19:44:16Z  
dc.date.issued
2016-12  
dc.identifier.citation
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  
dc.identifier.issn
1745-2473  
dc.identifier.uri
http://hdl.handle.net/11336/23609  
dc.description.abstract
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.  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
Nature Publishing Group  
dc.rights
info:eu-repo/semantics/openAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Milky Way  
dc.subject
Galaxy Formation  
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Astronomía  
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Ciencias Físicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
The age structure of the Milky Way's halo  
dc.type
info:eu-repo/semantics/article  
dc.type
info:ar-repo/semantics/artículo  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.date.updated
2017-08-25T19:55:13Z  
dc.journal.volume
12  
dc.journal.number
12  
dc.journal.pagination
1170-1176  
dc.journal.pais
Reino Unido  
dc.journal.ciudad
Londres  
dc.description.fil
Fil: Carollo, D.. University of Notre Dame; Estados Unidos  
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Fil: Beers, T. C.. University of Notre Dame; Estados Unidos  
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Fil: Placco, V. M.. University of Notre Dame; Estados Unidos  
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Fil: Santucci, R. M.. Universidade de Sao Paulo; Brasil  
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Fil: Denissenkov, P.. University Of Victoria; Canadá  
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Fil: Tissera, Patricia Beatriz. Consejo Nacional de Investigaciónes Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Astronomía y Física del Espacio. - Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Astronomía y Física del Espacio; Argentina  
dc.description.fil
Fil: Lentner, G.. University of Notre Dame; Estados Unidos  
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Fil: Rossi, S.. Universidade de Sao Paulo; Brasil  
dc.description.fil
Fil: Lee, Y. S.. Chungnam National University; Corea del Sur  
dc.description.fil
Fil: Tumlinson, J.. Space Telescope Science Institute; Estados Unidos  
dc.journal.title
Nature Physics  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1038/nphys3874  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1607.08628  
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info:eu-repo/semantics/altIdentifier/url/https://www.nature.com/nphys/journal/v12/n12/full/nphys3874.html