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Figure Rotation of Dark Halos in Cold Dark Matter Simulations

Published online by Cambridge University Press:  01 August 2006

S.E. Bryan  and
C.M. Cress
S.E. Bryan
Affiliation:
Department of Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa email: cressc@ukzn.ac.za
C.M. Cress
Affiliation:
Department of Physics, University of KwaZulu-Natal, Pietermaritzburg, South Africa email: cressc@ukzn.ac.za
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Abstract

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We investigate the rotation of dark matter halos identified in ΛCDM simulations. After removing halos that contain a significant amount of substructure, about 82% of the remaining halos were found to undergo coherent rotation over 5h−1 Gyr. The rotation speeds follow a log-normal distribution. The average rotation speed of a halo was 0.11h rads/Gyr. Less than half of the selected halos showed alignment between their rotation and minor axes. We found no correlation between halo properties, such as total mass, and the rotation speed.

Keywords

galaxies: kinematics and dynamicsmethods: N-body simulationsdark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S235: Galaxy Evolution Across the Hubble Time , August 2006 , pp. 80
Copyright
Copyright © International Astronomical Union 2007

References

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