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We present our results of the spectroscopic study of the lenticular galaxyNGC 4143 - an outskirt member of the Ursa Major cluster. Using the observationsat the 6-m SAO RAS telescope with the SCORPIO-2 spectrograph and also thearchive data of panoramic spectroscopy with the SAURON IFU at the WHT, we havedetected an extended inclined gaseous disk which is traced up to a distance ofabout 3.5 kpc from the center, with a spin approximately opposite to the spinof the stellar disk. The galaxy images in the H-alpha and [NII]6583 emissionlines obtained at the 2.5-m CMO SAI MSU telescope with the MaNGaL instrumenthave shown that the emission lines are excited by a shock wave. A spiralstructure that is absent in the stellar disk of the galaxy is clearly seen inthe brightness distribution of ionized-gas lines (H-alpha and [NII] from theMaNGaL data and [OIII] from the SAURON data). A complex analysis of both theLick index distribution along the radius and of the integrated colors,including the ultraviolet measurements with the GALEX space telescope and thenear-infrared measurements with the WISE space telescope, has shown that therehas been no star formation in the galaxy, perhaps, for the last 10 Gyr. Thus,the recent external-gas accretion detected in NGC 4143 from its kinematics, wasnot accompanied by star formation, probably, due to an inclined direction ofthe gas inflow onto the disk.

Extended Gaseous Disk in the S0 galaxy NGC 4143