086521

In our WISE-SDSS-selected sample of hyperluminous openParLbol > 10elev47 erg-sclosePar quasars openParWISSHclosePar we are finding a sizable fraction of sources with strongly blueshifted CIV emission lines openParv_civ < -2000 km-sclosePar and up to 1.5 dex lower X-ray luminosity openParL_XclosePar compared to that reported for normal quasars. Based on a sub-sample of 13 sources comma we find that L_X and v_civ significantly correlate. No relation is found at other bands. Furthermore comma at low L_X comma our constraints on Gamma and N_H are insufficient to verify a dependence on v_CIV. We propose for XMM observations to perform a complete X-ray coverage for the remaining 9 WISSH QSOs with measured v_civ. These will allow a refined investigation enabling us to discriminate between competing models for the origin of these sources.