Spiral Galaxies with a Larger Fraction of Dark Matter in the Region of 3-10 Mpc Around the Virgo and Fornax Clusters

This is a study of the dynamic characteristics of spiral galaxies with absolute magnitudes M ≥ –20 m .6 at distances of 3 to 10 Mpc from the Virgo and Fornax clusters based on data from the Merged Catalog of Galaxies MERCG. The diameters of the galaxies are used to determine the radius R D corresponding to the region with the greatest concentration of dark matter. Based on the condition of centrifugal equilibrium, the dynamic parameters of the spiral galaxies with M ≥ –20 m .6 are calculated and compared with the dynamic characteristics of spiral galaxies with M ≥ –20 m .6. It is found that there are many fewer spiral galaxies with M ≥ –20 m .6 and a larger fraction of dark matter in the regions surrounding these clusters, estimated at 12.7% in the vicinity of the Virgo cluster and 15.3% in the vicinity of the Fornax cluster.