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Title:
Spatial orientation of galaxies in the core of the Shapley concentration - the cluster Abell 3558
Authors:
Aryal, B.; Kandel, S. M.; Saurer, W.
Affiliation:
AA(Institut für Astrophysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria ; Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu, Nepal), AB(Central Department of Physics, Tribhuvan University, Kirtipur, Kathmandu, Nepal ), AC(Institut für Astrophysik, Universität Innsbruck, Technikerstraße 25, 6020 Innsbruck, Austria )
Publication:
Astronomy and Astrophysics, Volume 458, Issue 2, November I 2006, pp.357-367 (A&A Homepage)
Publication Date:
11/2006
Origin:
EDP Sciences
Keywords:
galaxies: clusters: general, galaxies: evolution, galaxies: spiral, galaxies: distances and redshifts, galaxies: formation, galaxies: statistics
DOI:
10.1051/0004-6361:20065179
Bibliographic Code:
2006A&A...458..357A

Abstract

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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