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Halo mergers in phase-space

Taylor, J. E. (2006) Halo mergers in phase-space. In: Mass profiles and shapes of cosmological structures. EAS Publications Series. No.20. EDP Sciences , Les Ulis, France, pp. 47-50. ISBN 2-86883-917-7.

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I consider a very simple model for the evolution of the real space and phase-space density profiles of a dark matter halo as it acquires its mass. I show that this model, which assumes slow growth through gradual accretion, predicts structures much more concentrated than those found in self-consistent simulations of halo formation. By implication, major mergers must act to reduce the concentration of dark matter haloes, adding the orbital energy of the infalling satellite to the internal energy of the pre-existing system and causing it to expand at intermediate radii. This effect should be easy to detect in numerical simulations.

Item Type:Book Section
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Additional Information:© 2006 EAS, EDP Sciences. Published online: 19 May 2006. I gratefully acknowledge support from the U.S. NSF under grant AST-0307859, and from the U.S. DoE under contract DE-FG02-04ER41316.
Funding AgencyGrant Number
Department of Energy (DOE)DE-FG02-04ER41316
Series Name:EAS Publications Series
Issue or Number:20
Record Number:CaltechAUTHORS:20110810-103746678
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Official Citation:Halo Mergers in Phase-space J.E. Taylor EAS Publications Series 20 47-50 (2006) DOI: 10.1051/eas:2006045
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:24783
Deposited On:10 Aug 2011 18:00
Last Modified:09 Nov 2021 16:26

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