AGN diagnostics for the sources in our Hβ λ4861-subsample, including all sources which have S/N > 3 in the relevant emission lines. Overall, our sample is consistent with star-forming galaxies. We remove one X-ray detected AGN from the sample. Left: [O II] λ3727/Hβ vs. [O III] λ4959, 5007/Hβ diagnostic from Lamareille et al. (2004), solid line, with the uncertainty indicated by the dashed lines). Right: mass-excitation diagram from Juneau et al. (2011). Galaxies in the region between the dashed and solid lines are on average identified as intermediate between AGN and SF.
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