Journal Article

Angular momentum evolution in dark-matter haloes

Laura G. Book, Alyson Brooks, Annika H. G. Peter, Andrew J. Benson and Fabio Governato

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 411, issue 3, pages 1963-1976
Published in print March 2011 | ISSN: 0035-8711
Published online February 2011 | e-ISSN: 1365-2966 | DOI: https://dx.doi.org/10.1111/j.1365-2966.2010.17824.x
Angular momentum evolution in dark-matter haloes

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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.

Keywords: galaxies: haloes; galaxies: kinematics and dynamics

Journal Article.  8687 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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