The authors have obtained redshifts and CCD photometry of nearly complete samples of galaxies within 1 Mpc of the centers of the Morgan poor clusters MKW 4 and AWM 4. These data are used to study the luminosity functions and the mass distributions of the clusters. For MKW 4 the authors have obtained a sufficient number of galaxy velocities (32) to construct a dynamical model for the cluster. Using the derived potential, they match the observed X-ray surface brightness profile if they allow for a weak cooling flow in the hot gas and if they take the mass distribution of the central galaxy into account. For AWM 4 no well-constrained models of the mass distribution could be obtained, but the best fitting models also give good agreement with X-ray data if a weak cooling flow in the hot gas is assumed.
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Malumuth et al. (1986) studied this question.