Fig. 3.
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BPT (Baldwin et al. 1981) line ratio diagram. The pair members are shown as a red circle (61168) and a red square (61167), respectively. The lines separating the emission powered by star formation or AGN by Kauffmann et al. (2003) and Kewley et al. (2013) are shown as dashed and dotted lines, respectively. Gray dots indicate galaxies at z = 0 from the MPA-JHU SDSS catalog (Brinchmann et al. 2004; Kauffmann et al. 2003; Tremonti et al. 2004).
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