Fig. 6.
BPT diagram showing the narrow emission line ratios of the six CLQs, three turning on (cross) and two turning off (star), and one turning off then on (plus). The heat map was produced using the MPA-JHU emission line analysis of 927 552 DR7 objects, thereby showing the overall SDSS trend (Brinchmann et al. 2004). Three emission line classification schemes are shown. Kauffmann et al. (2003) (dashed line) separates star-forming and composite host galaxies, Kewley et al. (2006) (dotted line) separates AGN and composite host galaxies, and Schawinski et al. (2007) separates LINERs from AGN.
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