tokens: An anonymous referee is gratefully acknowledged for the suggestions/comments which improved the paper. MP and PKP gratefully acknowledge support by the CSIR, New Delhi under the NET fellowship programme. This research has made use of (i) NASA's Astrophysics Data System, (ii) the SIMBAD data base, operated at CDS, Strasbourg, France, (iii) observations obtained with XMM–Newton , an ESA science mission with instruments and contributions directly funded by ESA Member States and NASA, and (iv) data, software and/or web tools obtained from the High Energy Astrophysics Science Archive Research Center (HEASARC), a service of the Astrophysics Science Division at NASA/GSFC and of the Smithsonian Astrophysical Observatory's High Energy Astrophysics Division.
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