Spatial orientation of galaxies in the core of the Shapley concentration - the cluster Abell 3558

Details Spatial orientation of galaxies in the core of the Shapley concentration - the cluster Abell 3558 Spatial orientation of galaxies in the core of the Shapley concentration - the cluster Abell 3558

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006a%26a...458..357a&link_type=abstract

Astronomy and Astrophysics, Volume 458, Issue 2, November I 2006, pp.357-367

Statistics

8

Galaxies: Clusters: General, Galaxies: Evolution, Galaxies: Spiral, Galaxies: Distances And Redshifts, Galaxies: Formation, Galaxies: Statistics

Scientific paper

We present an analysis of the spatial orientations of 323 galaxies in the cluster Abell 3558. Our aim is to examine non-random effects in galaxy orientations in the subsample of the cluster. The "position angle-inclination" method is used to find the three-dimensional rotation axes. To check for anisotropy or isotropy we carried out three statistical tests: Fourier, Kolmogorov-Smirnov, and Kuiper-V. We assumed a spatially isotropic distribution to examine non-random effects. The galaxies found in the investigated cluster region show isotropy in both two- and three-dimensional analyses of the galactic coordinate system. In addition, it is found that the overall isotropic appearance cannot be maintained when looking at the subsamples. The low radial-velocity galaxies in A 3558 showed anisotropy in both two- and three-dimensional analyses. A weak anisotropy is noticed in the hard X-ray emission region. Few subsamples shows similar alignments with respect to both the galactic and Supergalactic coordinate systems. We offer possible explanations of these anisotropies.

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