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We focus on an analysis of galaxies of high stellar mass and low metallicity.We cross-correlated the Millenium Galaxy Catalogue (MGC) and the Sloan DigitalSky Survey (SDSS) galaxy catalogue to provide a sample of MGC objects with highresolution imaging and both spectroscopic and photometric information availablein the SDSS database. For each galaxy in our sample, we conducted a systematicmorphological analysis by visual inspection of MGC images using theirluminosity contours. The galaxies are classified as either disturbed orundisturbed objects. We divide the sample into three metallicity regions,within wich we compare the properties of disturbed and undisturbed objects. Wefind that the fraction of galaxies that are strongly disturbed, indicative ofbeing merger remnants, is higher when lower metallicity objects are considered.The three bins analysed consist of approximatively 15%, 20%, and 50% disturbedgalaxies (for high, medium, and low metallicity, respectively). Moreover, theratio of the disturbed to undisturbed relative distributions of the populationage indicator, Dn(4000), in the low metallicity bin, indicates that thedisturbed objects have substantially younger stellar populations than theirundisturbed counterparts. In addition, we find that an analysis of colourdistributions provides similar results, showing that low metallicity galaxieswith a disturbed morphology are bluer than those that are undisturbed. Thebluer colours and younger populations of the low metallicity, morphologicallydisturbed objects suggest that they have experienced a recent merger with anassociated enhanced star formation rate. [abridged]

Metallicity of high stellar mass galaxies with signs of merger events