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Fig. A.1.

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WHAN diagram used to subdivide our mass-matched SF and AGN samples into various categories. All the objects to the left of -0.6 log[NII]/Hα are SF galaxies, and those below 0.5 Hα in the y-axis are considered to be passive. Galaxies above 0.5 Å EW(Hα) and to the right of -0.6 log[NII]/Hα are considered to be AGN (Cid Fernandes et al. 2011). The blue circles show the X-ray galaxies identified as AGN in both the BPT and WHAN diagrams.

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