Large-scale structures in the universe - Their form and orientation

Details Large-scale structures in the universe - Their form and orientation Large-scale structures in the universe - Their form and orientation

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193...47c&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 47-59.

Astronomy and Astrophysics

Astrophysics

5

Cosmology, Galactic Clusters, Galactic Evolution, Universe, Data Sampling, Spatial Distribution

Scientific paper

The purpose of this paper is to determine, using the available UGC sample complete to m = 14.5 or less, (1) whether or not it is possible to characterize the large scale structures (chains for brevity) by shape parameters, (2) whether or not galaxies are aligned along the major axis of the structure, and (3) whether or not neighbor 'chains' have similar orientation. The chains have been selected using a percolation algorithm. Catalogs have been created at various percolation vectors, that is listing chains at various density levels and illustrated the characteristics of the various structures. Shape parameters defined from the ratio of the principal axis of a modified tensor of inertia show their is not strong evidence for pancake like structures. Statistical evidence of chain-chain or galaxy-chain alignment is not found.

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