Fig. 8
Mid-infrared color–color diagram for X-ray emitting galaxies. Open circles represent objects with LX< 1042 ergs s-1 (normal galaxies), open squares are the values obtained for Seyfert-like AGNs with 1042 ≤ LX< 1044 ergs s-1 and filled dots are the corresponding values for QSOs with LX ≥ 1044 ergs s-1. The wedge is the AGN selection criterion of Stern et al. (2005).
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