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HI kinematic asymmetries are common in late-type galaxies irrespective ofenvironment, although the amplitudes are strikingly low in isolated galaxies.As part of our studies of the HI morphology and kinematics in isolatedlate-type galaxies we have chosen several very isolated galaxies from the AMIGAsample for HI mapping. Here we present GMRT 21-cm HI line mapping of CIG 340which was selected because its integrated HI spectrum has a very symmetricprofile, Aflux = 1.03. Optical images of the galaxy hinted at a warped disk incontrast to the symmetric integrated HI spectrum profile. Our aim is todetermine the extent to which the optical asymmetry is reflected in theresolved HI morphology and kinematics. GMRT observations reveal significant HImorphological asymmetries in CIG 340 despite it's overall symmetric opticalform and highly symmetric HI spectrum. The most notable HI features are: 1) awarp in the HI disk (with an optical counterpart), 2) the HI north/south fluxratio = 1.32 is much larger than expected from the integrated HI spectrumprofile and 3) a ~ 45" (12 kpc) HI extension, containing ~ 6% of the detectedHI mass on the northern side of the disk. We conclude that in isolated galaxiesa highly symmetric HI spectrum can mask significant HI morphologicalasymmetries. The northern HI extension appears to be the result of a recentperturbation (10^8 yr), possibly by a satellite which is now disrupted orprojected within the disk. This study provides an important step in our ongoingprogram to determine the predominant source of HI asymmetries in isolatedgalaxies. For CIG 340 the isolation from major companions, symmetric HIspectrum, optical morphology and interaction timescales have allowed us tonarrow the possible causes the HI asymmetries and identify tests to furtherconstrain the source of the asymmetries.

A ~ 12 kpc HI extension and other HI asymmetries in the isolated galaxy CIG 340 (IC 2487)