Galaxy Alignments as a Probe of the Dynamical State of Clusters

Details Galaxy Alignments as a Probe of the Dynamical State of Clusters Galaxy Alignments as a Probe of the Dynamical State of Clusters

2003-05-13

arxiv.org/abs/astro-ph/0305215v1

Astrophys.J. 594 (2003) 144-153

Astronomy and Astrophysics

Astrophysics

28 pages, 10 figures, accepted for publication in ApJ

Scientific paper

10.1086/376892

We present indications, based on a sample of 303 Abell clusters, for a relation between the dynamical state of clusters and the alignments of galaxy members with their parent cluster major axis orientation as well as with the large scale environment within which the clusters are embedded. The statistical results are complemented with a deep, wide-field case study of galaxy alignments in the cluster A521, which is characterised by multiple merging events (Maurogrdato et al 2000, Ferrari et al. 2003) and whose galaxy members show a strong alignment signal out to $\sim 5 h^{-1}$ Mpc. Our results show that galaxy alignments appear to be stronger the more dynamically young is the cluster, especially when found in high-density environments. This relation complements the recently found {``Cluster Substructure - Alignment Connection''} (Plionis & Basilakos 2002) by which dynamically young clusters, found in high-density environments, show stronger cluster-cluster alignments.

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