2–10 keV X-ray luminosity as a function of the 6 μm luminosity. The black (filled) and red (open) circles denote star-forming and AGN SEDs respectively. The solid lines denote the region occupied by unabsorbed AGN, while the region beyond the short-dashed line is populated by Compton-thick AGN in the local Universe (adapted from Bauer et al. 2010). The long-dashed line denotes the Lx/L6 μm ≈ 10-3 luminosity ratio of the undetected DOGs in the CDF-N (from Georgakakis et al. 2010). The crosses denote the flat-spectrum sources (see text). Finally for comparison we plot the positions of Mrk231 and Arp220 in the diagram.
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