V.4 No 1

61

On orbital stability of oscillators

The mechanics prompts another explanation of this paradox. First of all, the very shape of disk tells that this is the natural disk of galaxy, not gained because of collision with some other galaxy either capturing. Small density of the disk tells of two features of NGC 4650A. First, the galaxy has formed on the basis of compact nebula or star cluster. Due to its compactness, the charge separation in this galaxy occurred intensively and it gained fast rotation. With it there have formed a dense arm in which the secondary star-formation began, and due to it, practically all substance of galactic envelope coagulated into the stellar systems of the arm. Just so we can observe the disk as the stellar formations surrounded by a rarefied shroud of dust. Should the velocity of nucleus rotation were small and should the nucleus were separated weakly, so intensive coagulation of interstellar substance would be impossible.

But the main feature of this galaxy is that its nucleus is stretched along the rotation axis. This can be explained so that the stars of nucleus execute a complicated motion in two planes. The orbital plane of nuclear stars has a large (about 40- 50 degrees) inclination to the plane of galactic equator and these planes are precessing around the galactic axis, as shown in Fig. 20.

Fig. 20. The pattern of circular precession of stars orbiting within an elliptic galactic nucleus

This anomalous precession can take place only with a considerable angular velocity of nucleus rotation when considerable mass disbalance. Both factors are corroborated by the image shown in Fig. 19.