ИСТИНА

We study the morphology and kinematics of the ionization state of the gas in four ‘green valley’ early-type galaxies at different stages of their transition from a `blue cloud' of star-forming galaxies to the sequence of a passive evolution. The previous HI 21-cm mapping of the considered sample reveals a spatial offset between the cold gas reservoirs and stellar discs depending on the post-starburst age. Considering the ionized-gas properties is essential to understand the role of various feedback processes in the star formation quenching. We performed the long-slit and 3D optical spectroscopic observations at the 6-m Russian telescope and compared the gas and stellar kinematics. The spatial distribution of the ionized gas is in agreement with HI maps; however, the one-order higher angular resolution in the HII velocity fields allows us to study non-circular gas motions in detail, like AGN-driven outflow in the nucleus of J1117+51. The most intriguing result is the global HI+HII counter-rotation relative to the stellar disc accompanied by the significant circumnuclear gaseous warp in О1237+39. Therefore, in this case all the observed gas in the green valley galaxy was accreted from the environment.