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Angular Momentum and the Validity of the Adiabatic Contraction Assumption | Laura G. Book
; Alyson Brooks
; Annika H. G. Peter
; Andrew J. Benson
; Fabio Governato
; | Date: |
22 Jun 2010 | Abstract: | Adiabatic contraction is frequently used to model the effects of baryon
condensation on dark matter halos. However, it has recently been shown that
this model is not always accurate; authors including Gnedin et al. (2004) and
Gustafsson et al. (2006) have found it to be inaccurate at the level of tens of
percent. We have analyzed high resolution N-body simulations of dark matter
halos, focusing specifically on the evolution of angular momentum, to assess
the accuracy of the assumptions of the adiabatic contraction model. We
investigate the validity of the assumptions using dark-matter-only halos, in
order to provide a limit on how accurate we may expect the adiabatic
contraction model to be once baryons are included. In brief, we find that not
only is individual particle angular momentum not conserved, but the radial
profile and distribution of angular momentum also varies over the age of the
Universe by up to factors of a few. We find that torques from external
structure are the most likely cause for this distribution shift. This variation
implies that there is a fundamental limit on the possible accuracy of the
adiabatic contraction model in modeling the response of DM halos to the growth
of galaxies. | Source: | arXiv, 1006.4365 | Services: | Forum | Review | PDF | Favorites |
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