The elongation of Abell clusters. III- Rich clusters and initial conditions

Details The elongation of Abell clusters. III- Rich clusters and initial conditions The elongation of Abell clusters. III- Rich clusters and initial conditions

Jun 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....103.1721r&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 103, no. 6, June 1992, p. 1721-1728. Research supported by ASTRON.

Astronomy and Astrophysics

Astronomy

25

Galactic Clusters, Galactic Evolution, Astronomical Maps, Sky Surveys (Astronomy)

Scientific paper

The results are presented of a study of the elongation and orientation of a sample of 107 rich clusters of galaxies. The data consist of galaxy lists derived from digitized images of the Palomar Sky Survey red plate copies. Three measures of the cluster orientation are used: (1) the cluster position angle derived from the Fourier transform of the azimuthal galaxy distribution, (2) the first-ranked galaxy position angle derived from the moments of the digitized galaxy image, and (3) the cluster position angle derived from the X-ray surface brightness distribution. The orientation of clusters with respect to their nearest neighbors has been examined as a function of distance to the nearest neighbor. The orientation of clusters with respect to members of the same supercluster has also been examined. It is found that alignment effects are present for clusters residing in superclusters. It is also found that cD galaxies are significantly aligned with the direction to the nearest neighbor cluster. These results are discussed in the context of current ideas on galaxy formation.

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