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The haloes of bright satellite galaxies in a warm dark matter universe

Lovell, Mark R. ; Eke, Vincent ; Frenk, Carlos S. ; Gao, Liang ; Jenkins, Adrian ; Theuns, Tom ; Wang, Jie ; White, Simon D. M. ; Boyarsky, Alexey ; Ruchayskiy, Oleg

In: Monthly Notices of the Royal Astronomical Society, 2012, vol. 420, no. 3, p. 2318-2324

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    Titre
    • The haloes of bright satellite galaxies in a warm dark matter universe
    Auteur
    • Lovell, Mark R.. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • Eke, Vincent. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • Frenk, Carlos S.. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • Gao, Liang. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • Jenkins, Adrian. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • Theuns, Tom. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • Wang, Jie. Institute for Computational Cosmology, Durham University, South Road, Durham DH1 3LE
    • White, Simon D. M.. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Straße 1, 85740 Garching bei München, Germany
    • Boyarsky, Alexey. École Polytechnique Fédérale de Lausanne, FSB/ITP/LPPC, BSP 720, CH-1015 Lausanne, Switzerland
    • Ruchayskiy, Oleg. CERN Physics Department, Theory Division, CH-1211 Geneva 23, Switzerland
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2012, vol. 420, no. 3, p. 2318-2324. Blackwell Publishing Ltd
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:292489
    Summary
    High-resolution N-body simulations of galactic cold dark matter haloes indicate that we should expect to find a few satellite galaxies around the Milky Way whose haloes have a maximum circular velocity in excess of 40 km s−1. Yet, with the exception of the Magellanic Clouds and the Sagittarius dwarf, which likely reside in subhaloes with significantly larger velocities than this, the bright satellites of the Milky Way all appear to reside in subhaloes with maximum circular velocities below 40 km s−1. As recently highlighted by Boylan-Kolchin et al., this discrepancy implies that the majority of the most massive subhaloes within a cold dark matter galactic halo are too concentrated to be consistent with the kinematic data for the bright Milky Way satellites. Here we show that no such discrepancy exists if haloes are made of warm rather than cold dark matter because these haloes are less concentrated on account of their typically later formation epochs. Warm dark matter is one of several possible explanations for the observed kinematics of the satellites