The morphology of clusters of galaxies

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Photometry, Elliptical Galaxies, Galactic Clusters, Galactic Structure, Galactic Evolution, Magnitude, Morphology, Perturbation Theory, Radii

Scientific paper

Available deep samples of positional and photometric data on clusters of galaxies are analysed to give estimates of ellipticity and position angle at various limiting magnitudes and effective radii. Comparison of the ellipticity data with those for elliptical galaxies shows that clusters are apparently more elongated than elliptical galaxies. Comparison of position angles with those of cD galaxies in the clusters shows significant evidence for alignment. Both of these data are consistent with an adiabatic perturbation theory of cluster and galaxy formation.

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