Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..401m&link_type=abstract
Astronomy and Astrophysics, vol. 63, no. 3, Feb. 1978, p. 401-409.
Astronomy and Astrophysics
Astrophysics
84
Astronomical Catalogs, Galactic Clusters, Hierarchies, Spatial Distribution, Astronomical Coordinates, Classifications, Luminous Intensity, Radial Velocity
Scientific paper
A method of classifying groups of galaxies, called hierarchical clustering, is presented as a tool for the investigation of nearby groups of galaxies. The method is free from model assumptions about the groups. Scaling of the different coordinates is necessary, and the level from which one accepts the groups as real has to be determined. Hierarchical clustering is applied to an unbiased sample of galaxies in the Leo region. Five distinct groups result which have reasonable physical properties, such as low crossing times and conservative mass-to-light ratios, and which follow a radial-velocity-luminosity relation. Only four out of 39 galaxies were adopted as field galaxies.
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