088407

The growth of supermassive black holes (1e6 - 1e9 Msun) already observed at redshift as early as z and amp amp amp gt 7 is an open question that may have deep implications for the formation and evolution of their host galaxies. This growth is likely to involve lighter mass black hole (BH) seeds the so-called intermediate mass BH (IMBH 1e3 - 1e5 Msun). However their existence is still elusive. Hyper Luminous extragalactic and off-nuclear X-ray sources (HLX) with LX and amp amp amp gt 1e41 erg/s appear as good candidates to harbour IMBH but just a few of them are known. We request two XMM-Newton observations to follow two HLX candidates in NGC 5917 NGC 3583 recently identified from the 2SXPS Swift-XRT catalogue and never observed by XMM-Newton in order to constrain their spectral properties. [truncated! Please see actual data for full text]