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The distribution of galaxies has been studied to show the difference betweenthe blue cloud and red sequence and to define the green valley region. However,there are still many open questions regarding the importance of the greenvalley for understanding the morphological transformation and evolution ofgalaxies, how galaxies change from late-type to early-type and the role of AGNin galaxy formation and evolution scenario. The work focused on studying inmore details the properties of green valley galaxies by testing the six mostused selection criteria, differences between them, and how they may affect themain results and conclusions. The main findings are that, by selecting thegreen valley galaxies using different criteria, we are selecting differenttypes of galaxies in terms of their stellar masses, sSFR, SFR, spectroscopicclassification and morphological properties, where the difference was moresignificant for colour criteria than for sSFR and SFR vs. stellar-masscriteria.

Properties of green valley galaxies in relation to their selection criteria