The Virial Discrepancy in Clusters of Galaxies in the Context of Modified Newtonian DynamicsResolving the virial discrepancy in clusters of galaxies with modified Newtonian dynamics

Published in: Astrophys. J. 512 (1999) L23 citations recorded in [Science Citation Index] Abstract: A sample of 197 X-ray emitting clusters of galaxies is considered in the context of Milgrom's modified Newtonian dynamics (MOND). It is shown that the gas mass, extrapolated via an assumed $beta$ model to a fixed radius of 3 Mpc, is correlated with the gas temperature as predicted by MOND ($M_g propto T^2$). The observed temperatures are generally consistent with the inferred mass of hot gas; no substantial quantity of additional unseen matter is required in the context of MOND. However, modified dynamics cannot resolve the strong lensing discrepancy in those clusters where this phenomenon occurs. The prediction is that additional baryonic matter may be detected in the central regions of rich clusters.