AGN diagnostic diagrams for the member galaxies in the A2199 supercluster based on (a) optical [O iii]/Hβ vs. [N ii]/Hα line ratios; (b) and (c) WISE colors. Different spectral types following the scheme of Kewley et al. (2006) are represented by different colored symbols (Seyfert: red; LINER: pink; composite: green; SF: blue; ambiguous: black). The solid and dashed lines indicate the extreme starburst (Kewley et al. 2001) and pure SF limits (Kauffmann et al. 2003), respectively. Open red circles in (b) and (c) are Type I AGNs, and crosses in (b) and (c) are those whose spectral types are not determined because of lack of optical spectra. Solid lines in (b) and (c) are the AGN selection criteria proposed by Jarrett et al. (2011) and Assef et al. (2010), respectively. Horizontal dashed lines in (b) and (c) are the AGN selection criteria used in this study for galaxies in the A2199 supercluster.