Quantifying Substructure in Galaxy Clusters

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dc.creatorKnebe, Alexander
dc.creatorMueller, Volker
dc.date1999-12-28
dc.date.accessioned2026-07-07T02:35:13Z
dc.date.available2026-07-07T02:35:13Z
dc.descriptionSubstructure in galaxy clusters can be quantified with the robust Delta statistics (Dressler and Shectman 1988) which uses velocity kinematics and sky projected positions. We test its sensitivity using dissipationless numerical simulations of cluster formation. As in recent observations, about 30 % of the simulated clusters show substructure, but the exact percentage depends on the chosen limit for defining substructure, and a better discriminator is the distribution function of the Delta statistics. The Dressler-Shectman statistics correlate well with other subcluster indicators, but with large scatter due to its sensitivity to small infalling groups and projection effects.
dc.description6 pages LATEX using aa.sty with 7 figures, accepted for publication in A&A
dc.identifierhttps://arxiv.org/abs/astro-ph/9912534
dc.identifierhttp://arxiv.org/abs/astro-ph/9912534
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/15533
dc.subjectAstrophysics
dc.titleQuantifying Substructure in Galaxy Clusters
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