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Fig. 2


a) Loci of the three emission-line spectra (star-forming SF: CGC 007-025, composite (C): 2MASX J15452094+0812244 and LINER: MCG +00-03-030) fitted by fado (Figs. 35) on the BPT diagnostic diagram. The error bars and the ellipses depict 1σ level uncertainties in the emission-line ratios. The demarcation lines correspond to the SF/Hii regime (blue; Kauffmann et al. 2003c) and AGN (red; Kewley et al. 2001). The division between Seyfert and LINERs is delineated by the magenta dashed line (Schawinski et al. 2007). b) WHAN diagram (Cid Fernandes et al. 2010, 2011) with the position of the four spectra fitted by fado in Sect. 7 are shown for the sake of comparison with the BPT classification. This alternative diagnostic diagram attempts to classifiy galaxies in SF, strong AGN (sAGN), weak AGN (wAGN) and passive/retired. In this diagram, we additionally include the tentative locus of the passive (lineless) galaxy III Zw 014, for which BPT emission-line ratios are unavailable. The white shaded area in both diagrams depicts the distribution of galaxies from SDSS.

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