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The link between galactic satellite orbits and subhalo accretion.

Lovell, M.R.; Eke, V.R.; Frenk, C.S.; Jenkins, A.


M.R. Lovell


We calculate the orbital angular momentum of dark matter subhaloes in the Aquarius simulations of cold dark matter (CDM) galactic haloes. We calculate the orientation of their angular momentum relative to that of the spin vector of their host halo and find a variety of different configurations. All six Aquarius haloes contain statistically significant populations of subhalo orbits that are aligned with the main halo spin. All haloes possess a population of subhaloes that rotates in the same direction as the main halo and three of them possess, in addition, a population that rotates in the opposite direction. These configurations arise from the filamentary accretion of subhaloes. Quasi-planar distributions of coherently rotating satellites, such as those inferred in the Milky Way and other galaxies, arise naturally in simulations of a ΛCDM universe.


Lovell, M., Eke, V., Frenk, C., & Jenkins, A. (2011). The link between galactic satellite orbits and subhalo accretion. Monthly Notices of the Royal Astronomical Society, 413(4), 3013-3021.

Journal Article Type Article
Acceptance Date Jan 17, 2011
Online Publication Date May 20, 2011
Publication Date 2011-06
Deposit Date Jan 27, 2012
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 413
Issue 4
Pages 3013-3021
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