Free Access
Issue
Astron. Astrophys. Suppl. Ser.
Volume 134, Number 2, January II 1999
Page(s) 393 - 400
DOI https://doi.org/10.1051/aas:1999145
Published online 15 January 1999
DOI: 10.1051/aas:1999145

Astron. Astrophys. Suppl. Ser. 134, 393-400

The use of minimal spanning tree to characterize the 2D cluster galaxy distribution[*]

C. Adami 1,2 and A. Mazure 1

Send offprint request: C. Adami


1 - IGRAP, Laboratoire d'Astronomie Spatiale, Marseille, France
2 - Northwestern University, Chicago, U.S.A.

Received July 23; accepted August 5, 1998

Abstract:

We use the Minimal Spanning Tree to characterize the aggregation level of given sets of points. We test 3 distances based on the histogram of the MST edges to discriminate between the distributions. We calibrate the method by using artificial sets following Poisson, King or NFW distributions. The distance using the mean, the dispersion and the skewness of the histogram of MST edges provides the more efficient results. We apply this distance to a subsample of the ENACS clusters and we show that the bright galaxies are significantly more aggregated than the faint ones. The contamination provided by uniformly distributed field galaxies is negligible. On the other hand, we show that the presence of clustered groups on the same cluster line of sight masked the variation of the distance with the considered magnitude.

Key words: Cosmology: observations -- (Cosmology:) large-scale structure of Universe -- galaxies: clusters -- methods: data analysis

SIMBAD Objects

Copyright The European Southern Observatory (ESO)

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.