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.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.