Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..301s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 227, no. 2, Jan. 1990, p. 301-316.
Astronomy and Astrophysics
Astrophysics
85
Cosmology, Galactic Structure, Universe, Astronomical Catalogs, Density Distribution, Fourier Transformation, Galactic Clusters
Scientific paper
This paper describes a method for the automated detection and characterization of all the structural components in a catalog of galaxies. The local analysis of the distribution is performed using the wavelet transform, a new mathematical technique which achieves a complete insight of the structures scale by scale and allows one to look at the scaling properties. Statistically significant clusters and voids can be detected at each scale without the choice of artificial parameters. This technique is applied to a peculiar two-dimensional objective catalog of 7000 galaxies in a 6 x 6 deg field. Comparisons with well-known clusters and a previous method based on smoothed surface density enhancements are performed. The wavelet transform is shown to be very powerful, and serious information on the splitting, the fractal structure of the galaxy distribution, and the global topology is anticipated. Applications to the detection of substructures in clusters are expected.
Bijaoui Albert
Mars Gilbert
Slezak Eric
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