Early gas stripping as the origin of the darkest galaxies in the Universe

L. Mayer (), S. Kazantzidis (), C. Mastropietro and J. Wadsley
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L. Mayer: Institute for Theoretical Physics, University of Zurich, Winterthurestrasse 190, CH-8057 Zürich, Switzerland
S. Kazantzidis: Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, MS 29, Stanford, California 94309, USA
C. Mastropietro: Universitäts Sternwarte München, Scheinerstrasse 1, D-81679 München, Germany
J. Wadsley: McMaster University, Hamilton, Ontario L8S 4M1, Canada

Nature, 2007, vol. 445, issue 7129, 738-740

Abstract: Darkest of the dark Dwarf spheroidal galaxies are dominated by dark matter, and within their ranks Draco, Ursa Minor and Andromeda X are 'darkest'. None of the models so far proposed to explain their formation can account for both their exceptional dark matter content and their proximity to a much larger galaxy. Mayer et al. now report simulations showing that their progenitors were probably gas-dominated dwarf galaxies that became satellites of a larger galaxy earlier than the other dwarf spheroidals. Tidal shocks and ram pressure stripped all the gas from the progenitors about 10 billion years ago, leaving a tiny stellar component in a more massive dark halo, which is what we see today.

Date: 2007
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DOI: 10.1038/nature05552

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