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A low pre-infall mass for the Carina dwarf galaxy from disequilibrium modelling.
Ural, Ugur; Wilkinson, Mark I; Read, Justin I; Walker, Matthew G.
Afiliação
  • Ural U; Leibniz Institute für Astrophysik Potsdam, An der Sternwarte 16, Potsdam 14482, Germany.
  • Wilkinson MI; Department of Physics and Astronomy, University of Leicester, University Road, Leicester LE1 7RH, UK.
  • Read JI; Astrophysics Research Group, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, UK.
  • Walker MG; Department of Physics, McWilliams Center for Cosmology, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, Pennyslvania 15213, USA.
Nat Commun ; 6: 7599, 2015 Jul 02.
Article em En | MEDLINE | ID: mdl-26133650
Dark matter-only simulations of galaxy formation predict many more subhalos around a Milky Way-like galaxy than the number of observed satellites. Proposed solutions require the satellites to inhabit dark matter halos with masses 10(9)-10(10 )Msun at the time they fell into the Milky Way. Here we use a modelling approach, independent of cosmological simulations, to obtain a pre-infall mass of 3.6(-2.3)(+3.8) × 10(8) Msun for one of the Milky Way's satellites: Carina. This determination of a low halo mass for Carina can be accommodated within the standard model only if galaxy formation becomes stochastic in halos below ∼10(10 )Msun. Otherwise Carina, the eighth most luminous Milky Way dwarf, would be expected to inhabit a significantly more massive halo. The implication of this is that a population of 'dark dwarfs' should orbit the Milky Way: halos devoid of stars and yet more massive than many of their visible counterparts.

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article

Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2015 Tipo de documento: Article