On the relation between radial alignment of dark matter subhalos and host mass in cosmological simulations

Issue		EAS Publications Series Volume 36, 2009 Dark Energy and Dark Matter: Observations, Experiments and Theories


Page(s)		147 - 148
DOI		10.1051/eas/0936020
Published online		30 May 2009

Dark Energy and Dark Matter: Observations, Experiments and Theories
E. Pécontal, T. Buchert, Ph. Di Stefano and Y. Copin (eds)
EAS Publications Series, 36 (2009) 147-148
DOI: 10.1051/eas/0936020

On the relation between radial alignment of dark matter subhalos and host mass in cosmological simulations

N. Draganova and A. Knebe

Astrophysical Institute Potsdam, An der Sternwarte 16, Germany

Published online: 30 May 2009

Abstract
We explore the dependence of the radial alignment of subhalos on the mass of the host halo they orbit in. We have 25 well resolved host dark matter halos at our disposal ranging from $10^{15}~h^{-1}~{M_{\odot}}$ down to $10^{12}h^{-1}~{M_{\odot}}$ . We note that the radial alignment is independent of host halo mass and the distribution of $\cos\theta$ is well fitted by a simple power law $P(\cos\theta) \propto \cos^4\theta$ .

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