Fig. 3.
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Distributions of six potential features for the three principal activity classes: star-forming (SF), AGN, and passive galaxies. In the top left, we observe the EW of Hα; in the top right, the EW of [N II] λ6584; in the middle left, the EW of [O III] λ5007; in the middle right, D4000; in the bottom left, the EW of [S II] λλ6717,6731; and in the bottom right, the EW of [O I] λ6300. These features represent the equivalent widths of the corresponding emission lines commonly utilized in galactic activity classification models.
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