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We perform a comparative study of AGNs in pairs, triplets and groups. To thisend we use the Duplancic et al. catalogue of small galaxy systems and considerBPT and WHAN diagnostic diagrams to select optical AGNs. Also we identifymid-IR AGNs by using WISE data. We performed a comparison between the differentAGN classification methodologies and study the AGN fraction in pairs, triplets,and groups with four to six members. We also analyse the main properties ofOptical and mid-IR AGN hosts and the influence of environment on the activenuclei phenomena in these small galaxy systems. Our results show that,regardless the specifically adopted classification scheme, the fraction of AGNin pairs and triplets is always higher than the corresponding fraction ingroups. Moreover, the fraction of powerful AGNs in pair and triplets is abouttwice the fraction of regular AGNs. We also find a remarkable differencebetween Optical and mid-IR AGNs in groups, where host galaxies of WISE AGNs areless massive and concentrated, with young stellar populations and blue colours.Also all WISE AGNs in groups have a very close companions and reside in anintermediate global density environment. Galaxy triplets show a larger AGNfraction for galaxies with a close nearest neighbours, while pairs present anearly constant AGN fraction regardless the distance to the nearest companion.Our studies highlight the important role of interactions, besides the globalenvironment dependence, in the activation of the AGN phenomenon in small galaxysystems.

AGNs in Small Galaxy Systems: comparing the main properties of active objects in pairs, triplets and groups