tokens: The authors thank an anonymous referee for constructive comments that improved the clarity of the paper. This research is based on observations obtained with XMM-Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA, and AKARI , a JAXA project with the participation of ESA. This research made use of the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration, and the HyperLeda database ( http://leda.univ-lyon1.fr ). Facilities: XMM-Newton , AKARI
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