ИСТИНА

Despite the common opinion that lenticular galaxies are `red and dead', they often possess a noticeable amount of cold gas; and about the half of gas-rich S0 galaxies reveal some level of current star formation. However even those are located usually below the star formation main sequence. We have tried to search for reasons why star formation in gaseous disks of S0s is so inefficient. We have observed a sample of gas-rich S0 galaxies with the scanning Fabry-Perot interferometer of the Russian 6m telescope and have mapped the ionized-gas velocity fields. Though regularly rotating, these velocity fields demonstrate often decoupled orientation of the angular momentum. The higher is the inclination of the gas rotation plane to the main stellar disk, the lower incidence of the current star formation is found. We discuss the origin and dynamics of the extended gaseous disks within several nearby S0 galaxies and restrict the conditions of the star formation triggering in these disks.