Aquarius Supercluster of Galaxies discovered 1999

Discovery overview

Discovering parties: Department of Physics and Astronomy, University of Maine, Orono; Departement d’Astrophysique Extragalactique et de Cosmologie, Observatoire de Paris; The Department of Physics and Astronomy, St. Mary’s College

Official name: Aquarius Supercluster

Category: Supercluster of Galaxies

Location: Constellation Aquarius

Discovery credit

D. J. Batuski, C. J. Miller, and K. A. Slinglend of the Department of Physics and Astronomy, University of Maine

C.  Balkowski, S. Maurogordato, and V. Cayatte of Departement d’Astrophysique Extragalactique et de Cosmologie, Observatoire de Paris

R. Olowin of the Department of Physics and Astronomy, St. MaryÏs College

Confirmation

Observations leading to the discovery of the Aquarius Supercluster were conducted at the ESO 3.6 m telescope with the Meudon-ESO Fibre Optics Spectrograph.

American Astronomical Society Bulletin

K. Slinglend, D. Batuski, C. Miller (Univ. of Maine), C. Balkowski, V. Cayatte, P. Felenbok, S. Maurogordato (MEUDON), R. Olowin (St. Mary’s CA)

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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