# "TUNING FORK" CLASSIFICATION OF RICH CLUSTERS OF GALAXIES

HERBERT J. ROOD and GUMMULURU N. SASTRY
Publications of the Astronomical Society of the Pacific
Vol. 83, No. 493 (June 1971), pp. 313-319
Stable URL: http://www.jstor.org/stable/40675069
Page Count: 7

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## Abstract

A classification scheme of rich clusters of galaxies based on the distribution of the ten brightest member galaxies is described. The cluster types, which fall naturally into an ordered sequence with criteria varying systematically from one end to the other, can be represented by a "tuning fork" diagram: $cD - B\langle _{C - I}^{L - F}$ Preliminary types are listed for the 111 Abell clusters with distance classes less than four.

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