Galactic clusters

Details Galactic clusters Galactic clusters

Oct 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982s%26w....21..402w&link_type=abstract

Sterne und Weltraum, vol. 21, Oct. 1982, p. 402-405. In German.

Astronomy and Astrophysics

Astrophysics

Astronomical Photography, Galactic Clusters, Relaxation Time, Luminosity, Mass, Missing Mass (Astrophysics), Parameterization

Scientific paper

The physical parameters of galactic clusters are discussed. Over 55% of all galaxies belong to clusters and over 98% of all stars belong to multiple galactic systems. Clusters are classified as regular or irregular. The former are characterized by large numbers of galaxies, high central mass concentration, and generally spherical symmetry. Irregular clusters range from galaxy-poor ones such as the Local Cluster to rich ones. They show no particular symmetry and low central mass concentration. The two most important parameters in the study of clusters are the crossing time and the relaxation time. The former puts a minimum value on the age of a cluster, while the latter is used to study cluster dynamics. The cluster mass derived from the study of relaxation time is different from that derived from the mass-luminosity relationship for individual galaxies, resulting in the 'missing mass' problem.

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