M.R. Lovell
The haloes of bright satellite galaxies in a warm dark matter universe
Lovell, M.R.; Eke, V.; Frenk, C.S.; Gao, L.; Jenkins, A.; Theuns, T.; Wang, J.; White, S.D.M.; Boyarsky, A.; Ruchayskiy, O.
Authors
Dr Vincent Eke v.r.eke@durham.ac.uk
Associate Professor
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
L. Gao
Professor Adrian Jenkins a.r.jenkins@durham.ac.uk
Professor
Professor Tom Theuns tom.theuns@durham.ac.uk
Professor
J. Wang
S.D.M. White
A. Boyarsky
O. Ruchayskiy
Abstract
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.
Citation
Lovell, M., Eke, V., Frenk, C., Gao, L., Jenkins, A., Theuns, T., …Ruchayskiy, O. (2012). The haloes of bright satellite galaxies in a warm dark matter universe. Monthly Notices of the Royal Astronomical Society, 420(3), 2318-2324. https://doi.org/10.1111/j.1365-2966.2011.20200.x
Journal Article Type | Article |
---|---|
Publication Date | Mar 1, 2012 |
Deposit Date | Jan 20, 2014 |
Publicly Available Date | Aug 22, 2014 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 420 |
Issue | 3 |
Pages | 2318-2324 |
DOI | https://doi.org/10.1111/j.1365-2966.2011.20200.x |
Keywords | Galaxies: dwarf, Dark matter. |
Public URL | https://durham-repository.worktribe.com/output/1464584 |
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2012 The Authors Monthly Notices of the Royal Astronomical Society © 2012 RAS Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.
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