The clustering of galaxies

Details The clustering of galaxies The clustering of galaxies

Nov 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sciam.237...76g&link_type=abstract

Scientific American, vol. 237, Nov. 1977, p. 76-78, 84, 87-90 (4 ff.).

Astronomy and Astrophysics

Astronomy

14

Astronomical Models, Big Bang Cosmology, Galactic Clusters, Galactic Evolution, Star Distribution, Statistical Analysis, Virgo Galactic Cluster

Scientific paper

A hierarchical structure in the clustering of galaxies has been observed. One cluster, the Virgo cluster, is separated from us by a dense cloud of galaxies; this whole system is called the Local Supercluster. Maps of galaxy distribution have been made, based on apparent brightness expressed in terms of magnitude. Various approaches to obtaining quantitative measurements of galaxy distribution have been employed, including botanical and statistical methods. Correlation functions express quantitatively the observation that galaxies within a cluster are closer together than the average. A cluster hierarchy has been determined, based on information yielded by correlation functions. Using the pattern of galaxy clustering, a model universe may be made. The standard big-bang theory suggests that in the early universe there were no clusters, as matter was distributed uniformly. A simulation of cosmic evolution has been designed, and the results support the proposed theory of cluster hierarchy.

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