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Title: A low pre-infall mass for the Carina dwarf galaxy from disequilibrium modelling
Authors: Ural, U.
Wilkinson, Mark I.
Read, J. I.
Walker, M. G.
First Published: 2-Jul-2015
Publisher: Nature Publishing Group: Nature Communications
Citation: Nature Communications, 2015, 6, 7599
Abstract: 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[superscript: 9]-10[superscript: 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 [superscript: +3.8] [subscript: -2.3] X 10[superscript: 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[superscript: 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.
DOI Link: 10.1038/ncomms8599
eISSN: 2041-1723
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Copyright © 2015, Macmillan Publishers Limited. All rights reserved. This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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