Emission-line flux ratios of high-z type-2 AGNs plotted on the diagnostic diagram of C IVλ1549/He IIλ1640 versus C IIIλ1909/C IVλ1549 (left). Gray- and black-filled squares and arrows denote HzRGs compiled by Nagao et al. (2006c) and Matsuoka et al. (2009), respectively. The C IVλ1549/He IIλ1640 lower limit for TN J0924−2201 is shown as a light-gray arrow (Matsuoka et al. 2011a). Our new type-2 AGNs are shown as red-filled double circles (COSMOS 05162 and 10690). Orange circles denote X-ray selected type-2 AGNs in Nagao et al. (2006c). Middle panel: objects in our sample having an estimate of stellar mass as a function of redshift, and their emission-line flux ratios are plotted in the right panel. In the middle and right panels, symbols are same as the left panel but color-coded according to the stellar mass: bluer and redder for lower and higher mass objects, respectively. Note that open squares in these panels indicate HzRGs with upper limits of stellar masses.
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