Fig. 9
log [O iii]λ5007/Hβ versus log [N ii]λ6584/Hα BPT diagram. The solid curves show the empirical borders between photoionization by massive stars and other excitation mechanisms (Osterbrock & Ferland 2006), while the dotted lines show the demarcation proposed by Kewley et al. (2001). Black dots correspond to individual spaxels in Fig. 8. The values for region 1−3 of HS 2236+1344 are indicated in the diagram by red points. Blue data points show several low metallicity (12 + log(O/H) ≲ 7.6) SF regions from Izotov et al. (2012).
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