Fig. 6.
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Location of the various regions in the PJ308–21 system in the BPT diagram. The observed line ratios (and their limits) are plotted against the SDSS galaxy sample (purple shades) and the empirical thresholds between star-forming galaxies and AGN hosts (dashed lines, adopted from Kewley et al. 2006). Throughout the system, the high [O III]/Hβ line ratios suggest harder ionization conditions than the typical SDSS galaxy at low redshift.
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