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Astron. Astrophys. 339, 709-718 (1998)
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
Abstract
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
Contents
- 1. Introduction
- 2. Method for analysing the orientations
- 3. General description of the cluster Abell 754
- 4. Remarks pertaining to the evolution of the cluster
- 5. Analysis of the galaxy orientations
- 6. Conclusion
- Appendix A: the statistical methods applied to the data
- References
© European Southern Observatory (ESO) 1998
Online publication: October 22, 1998
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