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Clumps and groups of Abell clusters also exist

Clumps and groups of Abell clusters also exist - frequently...

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Clumps and groups of Abell clusters also exist, so that these have been used as tracers of the galaxy distribution to large distances - Abell 1961 (the year, not the cluster - AJ 66, 607), Murray et al 1978 (ApJLett 219, L89); Tully, Nearby Galaxies Atlas . These structures, if real, must persist in redshift as well as angular coordinates. Redshift surveys are now available for Abell clusters (since velocity dispersions require multiple objects anyway), for Zwicky galaxies and their southern counterparts from the CfA and SSRS groups; and for selected deep "postage- stamp" areas. The galaxy distribution is often shown in angle-redshift wedge diagrams. These
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Unformatted text preview: frequently show intricate structure - clouds, superclusters, filaments, sheets, voids. .. as shown in the famous "Slice of the Universe" by de Lapparent et al 1986 (ApJLett 302, L1, courtesy AAS): There is even evidence of structure extending on scales Δ z =0.1 (Tully 1986 ApJ 303, 25 and Nearby Galaxies Atlas ): and on equally large scales from the following abstract (BAAS 1990, 22, 753). This caused a bit of a stir, provoking further surveys in different directions to show that the apparent periodicity was an artifact of looking through a few sheetlike structures and not something about the redshifts per se ....
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