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We study the host properties and environment of active galactic nuclei (AGNs)galaxies, taken from SDSS-DR12, across the $\text{[O III]}/\text{H}\beta$ vs$\text{[N II]}/\text{H}\alpha$ diagnostic diagram. We select AGN subsamplesdefined as parallel and perpendicular to the star-forming locus on the BPTdiagram based on the Kauffmann et al. and Schawinski et al. criteria. Forparallel subsamples we find that AGN host properties exhibit a morphologicalevolution as they become more distant to the star-forming sequence. The localdensity environment shows a more evident morphology-density relationship forsubsamples mainly formed by Composite and Spiral galaxies than those containingLINERs and Seyferts, where the AGN emission is the dominant source. We alsoanalyse the properties of the five closest AGN neighbours observing nosignificant differences in the environment, although the AGN host properties ofevery subsample have noticeable variations. The AGNs belonging to perpendicularsubsamples show clear differences on their host properties from left top toright bottom on the diagram. However, the analysis of the local densityenvironment do not reflect strong dependency with the host AGN properties. Thisresult is reinforced by the characteristics of the AGN neighbouring galaxies.These findings suggest that mixed AGN/star-forming galaxies presentenvironmental features more similar to that of non-active galaxies. However, asAGNs at the centre of the more evolved galaxies become the dominant source, theenvironment tends to provide suitable conditions for the central black holefeeding with an increasing content of gas and likelihood of a higher mergerrate.

On the relation of host properties and environment of AGN galaxies across the standard optical diagnostic diagram