Issue |
Astron. Astrophys. Suppl. Ser.
Volume 117, Number 3, June II 1996
|
|
---|---|---|
Page(s) | 519 - 555 | |
DOI | https://doi.org/10.1051/aas:1996313 | |
Published online | 15 June 1996 |
Detection of structures on multiple scales around the South Galactic Pole
A two-dimensional analysis of the COSMOS/UKST Southern Sky Galaxy Catalogue
Royal Observatory, Blackford Hill, Edinburgh, EH9 3HJ, UK
Send offprint request to: Harvey T. MacGillivray
Received:
26
June
1995
Accepted:
14
December
1995
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 galaxies in an area of
degrees 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.
Key words: cosmology: large-scale structure of Universe / galaxies: clusters / surveys / methods: data analysis
© European Southern Observatory (ESO), 1996