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The Astrophysical Journal
Article . 2004 . Peer-reviewed
Data sources: Crossref
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https://dx.doi.org/10.25916/su...
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https://dx.doi.org/10.48550/ar...
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Anisotropy in the Distribution of Satellite Galaxy Orbits

Authors: Knebe, Alexander; Gill, Stuart P.; Gibson, Brad K.; Lewis, Geraint F.; Ibata, Rodrigo A.; Dopita, Michael A.;

Anisotropy in the Distribution of Satellite Galaxy Orbits

Abstract

Nearby clusters such as Virgo and Coma possess galaxy distributions that tend to be aligned with the principal axis of the cluster itself. This has also been confirmed by a recent statistical analysis of some 300 Abell clusters, where the effect has been linked to the dynamical state of the cluster. Moreover, the orbits of satellite galaxies in galactic systems like our own Milky Way also demonstrate a high degree of anisotropy-the so-called Holmberg effect, the origin of which has been the subject of debate for more than 30 years. This study presents the analysis of cosmological simulations focusing on the orbits of satellite galaxies within dark matter halos. The apocenters of the orbits of these satellites are preferentially found within a cone of opening angle ~40° around the major axis of the host halo, in accordance with the observed anisotropy found in galaxy clusters. We do, however, note that a link to the dynamical age of the cluster is not well established, as both of our oldest dark matter halos do show a clear anisotropy signal. Further analysis connects this distribution to the infall pattern of satellites along the filaments: the orbits are determined rather by the environment of the host halo than some ``dynamical selection'' during their life within the host's virial radius.

Keywords

Methods: numerical, Astrophysics (astro-ph), FOS: Physical sciences, Galaxies: formation, Astrophysics, 520, Keywords: Cosmology: theory

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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
116
Top 10%
Top 10%
Top 10%
Green
gold