Does There Really Exist the Problem of the Dark Matter in Spiral Galaxies?

Abstract

A simple model for the dust media describing evolution of the system like spiral galaxy is considered. In contrast to previous considerations we show that the initial density fold should be quasi-one-dimensional (bar-like) instead of disc-like. The disc component of the galaxies appears only during the evolution. The model naturally reproduces some essential features of the galaxies. In particular, it reproduces all the observed typical forms of the rotation curves for the spiral galaxies with a characteristic minimum and plateau. It appears that the plateau corresponds to escaping the matter (external spiral arms, due to initial conditions, have too large velocities to be confined by the gravitational field of the galaxy). Such a scenario of the galaxy evolution leads to the conclusion that the hypothesis of the dark matter is not necessary (at least, for the spiral galaxies).