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Title: Solving the Puzzle of Subhalo Spins
Authors: Wang, Y.
Lin, W.
Pearce, F.
Lux, H.
Muldrew, Stuart I.
Onions, J.
First Published: 10-Mar-2015
Publisher: American Astronomical Society, IOP Publishing
Citation: The Astrophysical Journal: an international review of astronomy and astronomical physics, 2015, 801:93 (10pp)
Abstract: Investigating the spin parameter distribution of subhalos in two high-resolution isolated halo simulations, recent work by Onions et al. suggested that typical subhalo spins are consistently lower than the spin distribution found for field halos. To further examine this puzzle, we have analyzed simulations of a cosmological volume with sufficient resolution to resolve a significant subhalo population. We confirm the result of Onions et al. and show that the typical spin of a subhalo decreases with decreasing mass and increasing proximity to the host halo center. We interpret this as the growing influence of tidal stripping in removing the outer layers, and hence the higher angular momentum particles, of the subhalos as they move within the host potential. Investigating the redshift dependence of this effect, we find that the typical subhalo spin is smaller with decreasing redshift. This indicates a temporal evolution, as expected in the tidal stripping scenario.
DOI Link: 10.1088/0004-637X/801/2/93
ISSN: 0004-637X
eISSN: 1538-4357
Version: Publisher Version
Status: Peer-reviewed
Type: Journal Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website. © 2015. The American Astronomical Society. All rights reserved. Version of record:
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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