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Optical spectroscopy of candidates for quasars at 3 < z < 5.5 from the XMM-newton X-ray survey. A distant X-ray quasar at z = 5.08

Sazonov, S. Yu.; Eselevich, M. V.; Khorunzhev, G. A. +2 more

We present the results of optical spectroscopy for 19 quasar candidates at photometric redshifts z _phot ≳ 3, 18 of which enter into the Khorunzhev et al. (2016) catalog (K16). This is a catalog of quasar candidates and known type 1 quasars selected among the X-ray sources of the 3XMM-DR4 catalog of the XMM-Newton serendipitous survey. W…