Abstract
APPLICATION of the virial theorem to clusters of galaxies1–3 has shown that the masses of such clusters are unexpectedly large. For the Virgo Cluster4 a mass of 1 × 1015 M⊙ is obtained from the virial theorem. This value is between one and two orders of magnitude larger than the combined mass of all of the known cluster galaxies. This suggests that most of the mass, which is required to stabilize the cluster, might be in the form of invisible collapsed objects.
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DEN BERGH, S. Collapsed Objects in Clusters of Galaxies. Nature 224, 891 (1969). https://doi.org/10.1038/224891a0
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DOI: https://doi.org/10.1038/224891a0
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