Rest-frame LX versus (vs.) L6 μm luminosity diagram for the unambiguous AGN i.e. those with intrinsic X-ray 2–10 keV luminosity LX > 1042 erg s-1. The X-ray luminosity is uncorrected for absorption, while the mid-IR luminosity includes both the torus and the star-formation component. The black and the red circles correspond to the Compton-thick and Compton-thin sources in the AGN (LX > 1042 erg s-1) sample of Brightman & Nandra (2011a). The shaded area denotes the Compton-thick regime based on the average LX/L6 μm relation (corrected for obscuration) found for local AGN by Lutz et al. (2004) scaled down assuming a 3% fraction of reflected emission from the backside of the obscuring screen in the 2–10 keV band. The dispersion in this relation is ≈ 0.7 dex for type-2 AGN. The blue lines show the luminosity-dependent average relation for Compton-thick AGN based on the COSMOS AGN assuming a 3% (solid-line) and a 1% (dashed-line) fraction of reflected emission. Only one Compton-thick source (2MASX J15504152) lies above the nominal Compton-thick regime as defined by the Fiore et al. (2009) average relation assuming a 3% reflection.
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