Quantifying Substructure in Galaxy Clusters

Details Quantifying Substructure in Galaxy Clusters Quantifying Substructure in Galaxy Clusters

1999-12-28

arxiv.org/abs/astro-ph/9912534v1

Astronomy and Astrophysics

Astrophysics

6 pages LATEX using aa.sty with 7 figures, accepted for publication in A&A

Scientific paper

Substructure 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.

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