ИСТИНА

The features of the dark matter distribution in galaxies determine largely the evolution of visible matter. We examined the reliability of estimates of pseudoisothermal, Burkert and NFW dark halo parameters for the methods based on the mass-modelling of the rotation curves. We showed that in a half of considered galaxies the best-fitting results are questionable. The trustworthiness of the results depends on the shape and the extension of rotation curve and on the availability of detailed data for the central parts of rotation curves. To reproduce the possible features of the observations we made tests showing how the parameters of the three halo types change in the cases of a lack of kinematic data in the central or peripheral areas and for different spatial resolutions. The central densities and the characteristic radial scales of dark haloes appear to be quite uncertain. In contrast, the estimates of dark halo mass within optical borders are much more reliable.