Substructure within clusters of galaxies

Details Substructure within clusters of galaxies Substructure within clusters of galaxies

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..421g&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 94, June-July 1982, p. 421-439.

Astronomy and Astrophysics

Astronomy

240

Astronomical Maps, Density Distribution, Galactic Clusters, Galactic Structure, Brightness Distribution, Space Density

Scientific paper

Surface number density contour maps based on Dressler's (1976, 1980) studies of 65 rich clusters are presented to demonstrate the frequent occurrence of substructure in these dense systems. A prescription is given for examining the significance of such structure and it is shown that structure on scales equal to or larger than 0.24 Mpc (H0 = 100 km/s Mpc) is present in approximately 40% of the clusters in this sample. Many of the remaining clusters are elongated. The contour plots are useful for comparison with X-ray surface brightness maps. Together with available velocity data, they also serve warning that many rich clusters may not be simply characterized by a single core radius and velocity dispersion.

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