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Fig. 5


The X-ray colour (HR) as a function of infrared luminosity and its distribution. See the text for the definition of HR. While the HR is derived for individual components in a single object when the X-ray sources are well resolved into multiple components (i.e., the nuclear separation is  ~4′′ or larger; see Table 3). The threshold for selecting AGN, based on the HR  >  −0.3, is indicated by the dashed line. Objects in which a 6.4 keV Fe Kα line detetion has been reported are marked by open circles. Three known Compton thick AGN with strong (6.4 keV) Fe K (NGC 3690 W, NGC 6240, VV340 N) lie below the HR threshold. The HR distribution histogram of HR is attached on the right hand side. The median is HR = −0.56.

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