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We have studied a sample of completely isolated galaxies by means oflong-slit spectroscopy at the 6-m telescope. We have found that 7 of 12 (58 +/-14 %) galaxies have revealed a presence of large-scale ionized-gas componentwhich angular momentum is mostly differ from stellar one: 5 of 7 (71 +/- 17 %)show a visible counterrottation. The diagnostic diagram demonstrates a widerange of gas excitation mechanism. We have estimated the gas oxygen abundancein the cases where excitation mechanism by young stars dominates and have foundthat ionized gas has a subsolar metallicity. We concluded that cold-gasaccretion from primordial cosmological filaments is unlikely for these objects,while external accretion from dwarf gas-rich satellites is more suitable.

Decoupled gas kinematics in isolated early-type disc galaxies