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We investigate interaction effects on the dynamics and morphology of thegalaxy pairs AM\,2058-381 and AM\,1228-260. This work is based on $r'$ imagesand long-slit spectra obtained with the Gemini Multi-Object Spectrograph at theGemini South Telescope. The luminosity ratio between the main (AM\,2058A) andsecondary (AM\,2058B) components of the first pair is a factor of $\sim$ 5,while for the other pair, the main (AM\,1228A) component is 20 times moreluminous than the secondary (AM\,1228B). The four galaxies have pseudo-bulges,with a S\'ersic index $n<2$. Their observed radial velocities profiles (RVPs)present several irregularities. The receding side of the RVP of AM\,2058A isdisplaced with respect to the velocity field model, while there is a strongevidence that AM\,2058B is a tumbling body, rotating along its major axis. TheRVPs for AM\,1228A indicate a misalignment between the kinematic andphotometric major axes. The RVP for AM\,1228B is quite perturbed, very likelydue to the interaction with AM\,1228A. NFW halo parameters for AM\,2058A aresimilar to those of the Milky Way and M\,31. The halo mass of AM\,1228A isroughly 10\% that of AM\,2058A. The mass-to-light (M/L) of AM\,2058 agrees withthe mean value derived for late-type spirals, while the low M/L for AM\,1228Amay be due to the intense star formation ongoing in this galaxy.

Photometry and dynamics of the minor mergers AM\,1228-260 and AM\,2058-381