Fig. 14.
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Ionisation nature diagnostics. Upper panel: [OIII]/Hβ vs. [NII]/Hα diagnostic diagram. Overplotted are the derived separations between LINER/Seyfert (S+07, Schawinski et al. 2007) and HII regions (K+01 and K+03, Kewley et al. 2001; Kauffmann et al. 2003). Lower panel: [SII]/Hα – [SIII]/Hα diagnostic diagram. Overplotted are the dust-free AGN photo-ionisation models (G+04, Groves et al. 2004).
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