Angular momentum evolution in dark-matter haloes

Type Journal Article
Names Laura G. Book, Alyson Brooks, Annika H. G. Peter, Andrew J. Benson, Fabio Governato
Publication Monthly Notices of the Royal Astronomical Society
Volume 411
Issue 3
Pages 1963-1976
Date March 1, 2011
Library Catalog NASA ADS
Abstract We have analysed high-resolution N-body simulations of dark-matter (DM) haloes, focusing specifically on the evolution of angular momentum. We find that not only is individual particle angular momentum not conserved, but the angular momentum of radial shells 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. Since the model of adiabatic contraction that is often applied to model the effects of galaxy evolution on the DM density profile in a halo assumes angular momentum conservation, this variation implies that there is a fundamental limit on the possible accuracy of the adiabatic contraction model in modelling the response of DM haloes to the growth of galaxies.
Tags galaxies: haloes, galaxies: kinematics and dynamics
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