1973•Publications of the Astronomical Society of the PacificOpen access

The Remarkable Cluster Shakhbazian I

Halton Arp, G. R. Burbidge, T. W. Jones

Abstract

A plate of the compact cluster of galaxies Shakhbazian I is shown and described. Various possible models for the cluster are analyzed. We conclude, as did Robinson and Wampler (1973), that it is most likely a highly condensed bound cluster of compact galaxies. The total mass of the cluster is 4-7 >c 1011 , and the mass-to-light ratio (photographic) is 0.30.5. The nature of the galaxies, the size of the cluster, and the very small velocity dispersion all make this cluster unique. Key words: galaxies - cluster of galaxies - compact galaxies

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Key concepts: Brightest cluster galaxy, Astrophysics, Velocity dispersion, Galaxy cluster, Physics, Cluster (spacecraft), Abell 2744, Elliptical galaxy