Astron. Astrophys., Suppl. Ser., 117, 519-555 (1996/June-2)
Detection of structures on multiple scales around the South Galactic Pole. A two-dimensional analysis of the COSMOS/UKST Southern Sky Galaxy Catalogue.
ESCALERA E. and MacGILLIVRAY H.T.
Abstract (from CDS):
We report the results of a 2D analysis of distributions of galaxies in a search for structures on a wide range of scales, from clusters up to superclusters and beyond, including the identification of voids. The structures are identified in data from the COSMOS/UKST Southern Sky Galaxy Catalogue (CUSSGC). The subsample used in this first investigation contains some 1.4x106 galaxies in an area of ∼69x44degrees around the South Galactic Pole. From our analysis, we find 25 very large-scale structures (of 10 degrees or more in extent), about 60 structures of intermediate scales (superclusters and/or elongated features), and more than 220 cluster-sized objects. All these features are significant, having high confidence levels for detection. Some extended voids are also detected in this area, likewise with high significance. This work is based on the use of the wavelet transform, the method of which has already been extensively described in a previous paper in which we demonstrated the principle of the technique. The wavelet analysis gives the position of the structures detected, together with significance levels and some parametrisation of their properties (extent, population, elongation, etc). Ultimately, our aim is the construction of a large and homogeneous database of structures on all scales in this important part of the southern sky.
cosmology: large-scale structure of Universe - galaxies: clusters - surveys - methods: data analysis
VizieR on-line data:
<Available at CDS (J/A+AS/117/519): table1 table2 table3 table4 table5 table6 table7 table8 table9 table10>
Table 11: [EM96] OA (Nos OA-OC). Table 12: [EM96] COS-NNNN, (Nos 0001-0025), (Nos 0101-0119), (Nos 1001-1267)
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