Fig. 2.
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Mass-excitation diagram. Grey dots represent galaxies in the zCOSMOS survey with ASPIC spectral-line measurements. The regions marked with dashed lines show the location of AGNs, composites, and star-forming galaxies. Grey circles represent X-ray sources, and red and blue circles represent obscured and unobscured AGNs with X-ray emission. Green circles denote X-ray-detected sources identified as star-forming galaxies. The dotted horizontal line at y = 0.5 shows the separation between high- and low-excitation AGNs.
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