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Interactions of Satellite Galaxies in Cosmological Dark Matter Halos

Published online by Cambridge University Press:  05 March 2013

Alexander Knebe ,
Stuart P. D. Gill  and
Brad K. Gibson
Alexander Knebe*
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia
Stuart P. D. Gill
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia
Brad K. Gibson
Affiliation:
Centre for Astrophysics & Supercomputing, Swinburne University, Hawthorn VIC 3122, Australia
*
2E-mail: aknebe@astro.swin.edu.au
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Abstract

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We present a statistical analysis of the interactions between satellite galaxies in cosmological dark matter halos taken from fully self-consistent high-resolution simulations of galaxy clusters. We show that the number distribution of satellite encounters has a tail that extends to as many as three to four encounters per orbit. On average 30% of the substructure population had at least one encounter (per orbit) with another satellite galaxy. However, this result depends on the age of the dark matter host halo with a clear trend for more interactions in younger systems. We also report a correlation between the number of encounters and the distance of the satellites to the centre of the cluster — satellite galaxies closer to the centre experience more interactions. However, this can be simply explained by the radial distribution of the substructure population and merely reflects the fact that the density of satellites is higher in those regions.

In order to find substructure galaxies we applied (and present) a new technique based upon the N-body code MLAPM. This new halo finder MHF (MLAPM’s halo finder) acts with exactly the same accuracy as the N-body code itself and is therefore free of any bias and spurious mismatch between simulation data and halo finding precision related to numerical effects.

Keywords

methods: N-body simulationsgalaxies: clustersgalaxies: kinematics and dynamicscosmology: dark matter
Type
Research Article
Information
Publications of the Astronomical Society of Australia , Volume 21 , Issue 2: The Fifth Workshop on Galactic Chemodynamics , 2004 , pp. 216 - 221
Copyright
Copyright © Astronomical Society of Australia 2004

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