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We investigate the spatial distribution of chemical abundances in a sample oflow metallicity Wolf-Rayet (WR) galaxies selected from the SDSS. We used theintegral field spectroscopy technique in the optical spectral range (3700-6850AA) with PMAS attached to the CAHA 3.5 m telescope. Our statistical analysis ofthe spatial distributions of O/H and N/O, as derived using the direct method orstrong-line parameters consistent with it, indicates that metallicity ishomogeneous in five out of the six analysed objects in scales of the order ofseveral kpc. Only in the object WR404, a gradient of metallicity is found inthe direction of the low surface brightness tail. In contrast,we found anoverabundance of N/O in spatial scales of the order of hundreds of pcassociated with or close to the positions of the WR stars in 4 out of the 6galaxies. We exclude possible hydrodynamical causes, such as the metal-poor gasinflow, for this local pollution by means of the analysis of themass-metallicity relation (MZR) and mass-nitrogen-to-oxygen relation (MNOR) forthe WR galaxies catalogued in the SDSS.

Are Wolf-Rayet stars able to pollute the interstellar medium of galaxies? Results from the integral field spectroscopy