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Abstract:

We analyse the density profiles of the stellar halo populations in eight MilkyWay mass galaxies, simulatedwithin theΔcold dark matter scenario.We find that accreted stars can be well fitted by an Einasto profile, as well as any subsample defined according to metallicity.We detect a clear correlation between the Einasto fitting parameters of the low-metallicity stellar populations and those of the dark matter (DM) haloes. The correlations for stars with [Fe/H] < -3 allow us to predict the shape of the dark matter profiles within residuals of ~10 per cent, in case the contribution from in situ stars remains small. Using Einasto parameters estimated for the stellar halo of the Milky Way and assuming the later formed with significant contributions from accreted low-mass satellite, our simulations predict α ~ 0.15 and r2 ~ 15 kpc for its dark matter profile. These values, combined with observed estimations of the local DM density, yield an enclosed DM mass at ~8 kpc in the range 3.9-6.7 × 1010 M⊙, in agreement with recent observational results. These findings suggest that low-metallicity stellar haloes could store relevant information on the DM haloes. Forthcoming observations would help us to further constrain our models and predictions. © 2014 The Authors.

Registro:

Documento: Artículo
Título:Low-metallicity stellar halo populations as tracers of dark matter haloes
Autor:Tissera, P.B.; Scannapieco, C.
Filiación:Departamento de Ciencias Fisicas, Universidad Andres Bello, Av. Republica 220, Santiago, 8370134, Chile
Instituto de Astronomía y Física del Espacio, CONICET-UBA, Casilla de Correos 67, Suc. 28, Buenos Aires, 1428, Argentina
Millenium Institute of Astrophysics (MAS), Casilla 36-DSantiago, Chile
Leibniz-Institut für Astrophysik Potsdam (AIP), An der Sternwarte 16, Potsdam, D-14482, Germany
Palabras clave:Galaxies evolution; Galaxies formation; Galaxies haloes; Galaxy structure
Año:2014
Volumen:445
Número:1
Página de inicio:L21
Página de fin:L25
DOI: http://dx.doi.org/10.1093/mnrasl/slu114
Título revista:Monthly Notices of the Royal Astronomical Society: Letters
Título revista abreviado:Mon. Not. R. Astron. Soc. Lett
ISSN:17453925
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_17453925_v445_n1_pL21_Tissera

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Citas:

---------- APA ----------
Tissera, P.B. & Scannapieco, C. (2014) . Low-metallicity stellar halo populations as tracers of dark matter haloes. Monthly Notices of the Royal Astronomical Society: Letters, 445(1), L21-L25.
http://dx.doi.org/10.1093/mnrasl/slu114
---------- CHICAGO ----------
Tissera, P.B., Scannapieco, C. "Low-metallicity stellar halo populations as tracers of dark matter haloes" . Monthly Notices of the Royal Astronomical Society: Letters 445, no. 1 (2014) : L21-L25.
http://dx.doi.org/10.1093/mnrasl/slu114
---------- MLA ----------
Tissera, P.B., Scannapieco, C. "Low-metallicity stellar halo populations as tracers of dark matter haloes" . Monthly Notices of the Royal Astronomical Society: Letters, vol. 445, no. 1, 2014, pp. L21-L25.
http://dx.doi.org/10.1093/mnrasl/slu114
---------- VANCOUVER ----------
Tissera, P.B., Scannapieco, C. Low-metallicity stellar halo populations as tracers of dark matter haloes. Mon. Not. R. Astron. Soc. Lett. 2014;445(1):L21-L25.
http://dx.doi.org/10.1093/mnrasl/slu114