Radial Alignment of Cluster Galaxies

Details Radial Alignment of Cluster Galaxies Radial Alignment of Cluster Galaxies

2004-11-25

arxiv.org/abs/astro-ph/0411710v2

Astronomy and Astrophysics

Astrophysics

4 pages, 3 figures

Scientific paper

10.1086/432089

We report the discovery of a statistically significant radial alignment of cluster galaxies in a sample of 85 X-ray selected clusters observed in the Sloan Digital Sky Survey. The tendency for alignment is a robust feature of our sample and does not vary significantly with individual cluster or galaxy properties. We use dynamical arguments to show that a significant fraction of cluster galaxies should be undergoing a parametric tidal resonance that can cause their long axes to orient themselves towards the center of the cluster potential, and therefore tentatively ascribe the observed radial alignment to this dynamical effect.

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