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Title: SOLVING THE PUZZLE OF SUBHALO SPINS

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.

Authors:
;  [1]; ; ;  [2];  [3]
  1. Key Laboratory for Research in Galaxies and Cosmology, Shanghai Astronomical Observatory, Shanghai 200030 (China)
  2. School of Physics and Astronomy, University of Nottingham, Nottingham, NG7 2RD (United Kingdom)
  3. Department of Physics and Astronomy, University of Leicester, University Road, Leicester, LE1 7RH (United Kingdom)
Publication Date:
OSTI Identifier:
22521386
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 801; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COSMOLOGY; GALAXIES; LAYERS; MASS; NONLUMINOUS MATTER; POTENTIALS; RED SHIFT; RESOLUTION; SPIN; STRIPPING

Citation Formats

Wang, Yang, Lin, Weipeng, Pearce, Frazer R., Lux, Hanni, Onions, Julian, and Muldrew, Stuart I., E-mail: wangyang@shao.ac.cn, E-mail: linwp@shao.ac.cn. SOLVING THE PUZZLE OF SUBHALO SPINS. United States: N. p., 2015. Web. doi:10.1088/0004-637X/801/2/93.
Wang, Yang, Lin, Weipeng, Pearce, Frazer R., Lux, Hanni, Onions, Julian, & Muldrew, Stuart I., E-mail: wangyang@shao.ac.cn, E-mail: linwp@shao.ac.cn. SOLVING THE PUZZLE OF SUBHALO SPINS. United States. doi:10.1088/0004-637X/801/2/93.
Wang, Yang, Lin, Weipeng, Pearce, Frazer R., Lux, Hanni, Onions, Julian, and Muldrew, Stuart I., E-mail: wangyang@shao.ac.cn, E-mail: linwp@shao.ac.cn. Tue . "SOLVING THE PUZZLE OF SUBHALO SPINS". United States. doi:10.1088/0004-637X/801/2/93.
@article{osti_22521386,
title = {SOLVING THE PUZZLE OF SUBHALO SPINS},
author = {Wang, Yang and Lin, Weipeng and Pearce, Frazer R. and Lux, Hanni and Onions, Julian and Muldrew, Stuart I., E-mail: wangyang@shao.ac.cn, E-mail: linwp@shao.ac.cn},
abstractNote = {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 = {10.1088/0004-637X/801/2/93},
journal = {Astrophysical Journal},
number = 2,
volume = 801,
place = {United States},
year = {Tue Mar 10 00:00:00 EDT 2015},
month = {Tue Mar 10 00:00:00 EDT 2015}
}