The observational properties of galaxies accumulated in the Updated Nearby Galaxy Catalog (UNGC) were used by us to derive an orbital mass of the Milky Way and Andromeda galaxy (M31) via motions of their 31 and 39 companions, respectively. The ratio of the orbital mass of galaxies, which is a measure of dark matter, to their stellar mass is [тільда]30. If this value is taken as the average value in the Universe, then in the standard cosmological ?CDM models it will match the value [omega]m [приблизно дорівнює] 0.09 instead of the generally accepted value [omega]m [приблизно дорівнює] 0.28. Taking into account that this last value is realised only in rich clusters, and that the cluster at hand contains only 10% of the total number of galaxies (while the rest are in groups or field galaxies), our results confirm the well-known problem of "lack of dark matter" in the Local group.
З 31.12.2014 по 01.03.2015 Наукова бібліотека читачів не обслуговує.
