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Astron. Astrophys. 339, 709-718 (1998)

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Substructures and galaxy orientations in clusters

I. The cluster Abell 754

W. Godlowski 1, F.W. Baier 2 and H.T. MacGillivray 3

1 Jagellonian University, Astronomical Observatory, ul. Orla 171, PL-30-244 Krakow, Poland
2 Institute for Communication and Structure Research, Heinrich-Mann-Allee 105 b, D-14473 Potsdam, Germany
3 Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, Scotland, UK

Received 29 June 1998 / Accepted 31 August 1998


We present a general description of the rich cluster of galaxies Abell 754, including a discussion of some aspects concerning its evolution, and present an analysis of the orientations of the galaxies in the cluster region. Previous studies from X-ray data and galaxy distributions have provided evidence for pronounced subclustering in this cluster. In this light, our aim has been to examine non-random effects in the galaxy orientations in rich clusters with particular regard to the presence of subclustering. Our results do provide evidence for non-random alignment of the galaxies in Abell 754 and confirm the presence of subclustering within this cluster. We intend to continue our investigations by studying, in a similar manner, other clusters the results for which will be published in due course.

Key words: methods: statistical – galaxies: clusters: general – galaxies: clusters: individual: A 754

Send offprint requests to: W. Godlowski

© European Southern Observatory (ESO) 1998

Online publication: October 22, 1998