The Aquarius Supercluster

Details The Aquarius Supercluster The Aquarius Supercluster

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.1302s&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #13.02; Bulletin of the American Astronomical Society, Vol. 28, p.1289

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Scientific paper

The results of spectroscopic observations of 42 R >= 1 clusters of galaxies from the Abell (1958) and Abell, Corwin, & Olowin (1989 - hereafter ACO) catalogs are presented. The observations were conducted at the ESO 3.6m telescope with the MEFOS multiple-fiber spectrograph. Thirty-seven of the clusters lie in a 10({deg) } x 50({deg) } strip of sky that contains two supercluster candidates (in Aquarius and Eridanus) that were identified by a percolation analysis of the Abell and ACO catalogs. This strip is now complete in redshift measurements to the point that all R >= 1 clusters with m10 < 18.3 (on the ACO scale) have at least one measured redshift per cluster. Most clusters have at least 5 measured redshifts. Seven other clusters were observed in a supercluster candidate in the Grus-Indus region. We find that one of the supercluster candidates is a filament of 22 clusters in a 13x overdensity that extends at least 210 h(-1) Mpc. This filament runs predominantly along the line of sight in the Aquarius region from z=0.08 to z=0.16. The extent of this supercluster is comparable to the largest structures previously found in the local universe (e. g., the Great Wall and Perseus-Pegasus). The Aquarius supercluster also contains a `knot' of six clusters at redshift z ~ 0.11 that represents an overdensity of 200 times the average spatial number density for ACO clusters. Two other similar cluster density enhancements have been identified within z <= 0.11: Corona Borealis and the Shapley Concentration.

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