ИСТИНА

Bulges with exponential surface brightness profiles are thought to be small, to occur mostly in late-type spirals and to be products of secular evolution. Multi-tiers (anti-truncated) disks recently recognized as a very frequent phenomenon in disk galaxies are thought to be products of minor mergers. We find that multiple extended exponential stellar components within one galaxy can often be met in lenticular, or early-type disk, galaxies. We are going to demonstrate observational examples of the exponential bulges and inner high-surface brightness disks in nearby lenticular galaxies and to show how one can distinguish between these two alternatives by involving kinematical data. We speculate that both the exponential bulges and the multi-tiers stellar disks may be relics of events when a lenticular galaxy forms by transformation from a spiral.