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Galaxy mass and environment play a major role in the evolution of galaxies.In the transition from star-forming to quenched galaxies, Active galacticnuclei (AGN) have also a principal action. However, the connections betweenthese three actors are still uncertain. In this work we investigate the effectsof stellar mass and the large-scale environment (LSS), on the fraction ofoptical nuclear activity in a population of isolated galaxies, where AGN wouldnot be triggered by recent galaxy interactions or mergers. As a continuation ofa previous work, we focus on isolated galaxies to study the effect of stellarmass and the LSS in terms of morphology (early- and late-type), colour (red andblue), and specific star formation rate (quenched and star-forming). To explorewhere AGN activity is affected by the LSS we fix the stellar mass into low- andhigh-mass galaxies. We use the tidal strength parameter to quantify theireffects. We found that AGN is strongly affected by stellar mass in 'active'galaxies (namely late-type, blue, and star-forming), however it has noinfluence for 'quiescent' galaxies (namely early-type, red, and quenched), atleast for masses down to $\rm 10^{10}\,[M_\odot]$. In relation to the LSS, wefound an increment on the fraction of SFN with denser LSS in low-mass starforming and red isolated galaxies. Regarding AGN, we find a clear increment ofthe fraction of AGN with denser environment in quenched and red isolatedgalaxies, independently of the stellar mass. AGN activity would be 'masstriggered' in 'active' isolated galaxies. This means that AGN is independent ofthe intrinsic property of the galaxies, but on its stellar mass. On the otherhand, AGN would be 'environment triggered' in 'quiescent' isolated galaxies,where the fraction of AGN in terms of sSFR and colour increases from voidregions to denser LSS, independently of its stellar mass.

The mass and environmental dependence on the secular processes of AGN in terms of morphology, colour, and specific star-formation rate