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

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  • L. Mayer

    (Institute for Theoretical Physics, University of Zurich, Winterthurestrasse 190, CH-8057 Zürich, Switzerland
    Institut für Astronomie, ETH Zürich, Wolfgang-Pauli-Strasse 16, CH-8093 Zürich, Switzerland)

  • S. Kazantzidis

    (Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, MS 29, Stanford, California 94309, USA
    Kavli Institute for Cosmological Physics, The University of Chicago, Illinois 60637, USA)

  • C. Mastropietro

    (Universitäts Sternwarte München, Scheinerstrasse 1, D-81679 München, Germany)

  • J. Wadsley

    (McMaster University, Hamilton, Ontario L8S 4M1, Canada)

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.

Suggested Citation

  • L. Mayer & S. Kazantzidis & C. Mastropietro & J. Wadsley, 2007. "Early gas stripping as the origin of the darkest galaxies in the Universe," Nature, Nature, vol. 445(7129), pages 738-740, February.
    • Handle: RePEc:nat:nature:v:445:y:2007:i:7129:d:10.1038_nature05552
    DOI: 10.1038/nature05552
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