Do the major axes of rich clusters of galaxies point toward their neighbors?

Details Do the major axes of rich clusters of galaxies point toward their neighbors? Do the major axes of rich clusters of galaxies point toward their neighbors?

Mar 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...338..711u&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 338, March 15, 1989, p. 711-717.

Astronomy and Astrophysics

Astrophysics

34

Cosmic X Rays, Galactic Clusters, Galactic Evolution, Dark Matter, Heao 2, Image Analysis, Red Shift

Scientific paper

The major axis orientation of rich clusters of galaxies, determined from an analysis of X-ray images, is used to investigate whether these clusters point toward their nearest neighbors. No statistical significance is found for a pointing effect between clusters and their nearest neighbors in either X-ray, optical, or combined X-ray and optical samples. Using updated redshifts and permitting nonstatistical sample Abell clusters as nearest neighbors does not affect this conclusion. The lack of statistical significance for a pointing effect favors hierarchical models in which galaxies form first, followed by clusters and then superclusters. For clusters with well-defined X-ray orientations, it is found that cluster position angles determined from X-ray and optical data are in general agreement.

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