Dynamic evidence on massive coronas of galaxies

Clusters of galaxies must contain dark matter, since the mass of hot intracluster gas is insufficient to stabilise clusters. It is suggested that the mass discrepancy can be explained if masses of galaxies have been underestimated due to the presence of massive and extended coronas of unknown origin. To estimate masses, radii and central densities of galactic coronas companions of 105 giant galaxies have been used as test particles. Data presented in Tables and Figures suggest that masses and radii of coronas exceed masses and radii of known stellar populations of galaxies by one order of magnitude. The presence of massive coronas of galaxies reduces (if not removes) the virial mass discrepancy in clusters of galaxies. The total density of matter in galaxies is 20% of the critical cosmological density.