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tokens: This research has made extensive use of data and/or software provided by the HEASARC, which is a service of the Astrophysics Science Division at NASA/GSFC and the High Energy Astrophysics Division of the Smithsonian Astrophysical Observatory. We also acknowledge the use of NASA's Astrophysics Data System (ADS) and of the SIMBAD data base, operated at CDS, Strasbourg, France. In this work, we analysed observations performed with INTEGRAL , an ESA project with instruments and science data centre funded by ESA member states (especially the PI countries: Denmark, France, Germany, Italy, Switzerland, Spain) and with the participation of Russia and the USA, and we also analysed observations obtained with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA). Moreover, this research has made use of data obtained from the Chandra Data Archive.