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We analyze the SDSS data to classify the galaxies based on their colour usinga fuzzy set-theoretic method and quantify their environments using the localdimension. We find that the fraction of the green galaxies does not depend onthe environment and $10\%-20\%$ of the galaxies at each environment are in thegreen valley depending on the stellar mass range chosen. Approximately $10\%$of the green galaxies at each environment host an AGN. Combining data from theGalaxy Zoo, we find that $\sim 95\%$ of the green galaxies are spirals and$\sim 5\%$ are ellipticals at each environment. Only $\sim 8\%$ of greengalaxies exhibit signs of interactions and mergers, $\sim 1\%$ have dominantbulge, and $\sim 6\%$ host a bar. We show that the stellar mass distributionsfor the red and green galaxies are quite similar at each environment. Ouranalysis suggests that the majority of the green galaxies must curtail theirstar formation using physical mechanism(s) other than interactions, mergers,and those driven by bulge, bar and AGN activity. We speculate that these arethe massive galaxies that have grown only via smooth accretion and suppressedthe star formation primarily through mass driven quenching. Using aKolmogorov-Smirnov test, we do not find any statistically significantdifference between the properties of green galaxies in different environments.We conclude that the environmental factors play a minor role and the internalprocesses play the dominant role in quenching star formation in the greenvalley galaxies.

Green valley galaxies in the cosmic web: internal versus environmental quenching