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Using VIMOS-IFU observations, we study the interstellar medium (ISM) of twostar-forming dwarf galaxies, UM 461 and Mrk 600. Our aim was to search for theexistence of metallicity inhomogeneities that might arise from infall of nearlypristine gas feeding ongoing localized star-formation. The IFU data allowed usto study the impact of external gas accretion on the chemical evolution as wellas the ionised gas kinematics and morphologies of these galaxies. Both systemsshow signs of morphological distortions, including cometary-like morphologies.We analysed the spatial variation of 12 + log(O/H) abundances within bothgalaxies using the direct method (T_e), the widely applied HII-CHI-mistry code,as well as by employing different standard calibrations. For UM 461 our resultsshow that the ISM is fairly well mixed, at large scales, however we find anoff-centre and low-metallicity region with 12 + log(O/H) < 7.6 in the SW partof the brightest HII region, using the direct method. This result is consistentwith the recent infall of a low mass metal-poor dwarf or HI cloud into theregion now exhibiting the lowest metallicity, which also displays localizedperturbed neutral and ionized gas kinematics. Mrk 600 in contrast, appears tobe chemically homogeneous on both large and small scales. The intrinsicdifferences in the spatially resolved properties of the ISM in our analysedgalaxies are consistent with these systems being at different evolutionarystages.

Detecting metal-poor gas accretion in the star-forming dwarf galaxies UM 461 and Mrk 600