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Catalog of candidates for quasars at 3 < z < 5.5 selected among X-Ray sources from the 3XMM-DR4 survey of the XMM-Newton observatory

Sazonov, S. Yu.; Khorunzhev, G. A.; Burenin, R. A. +1 more

We have compiled a catalog of 903 candidates for type 1 quasars at redshifts 3 < z < 5.5 selected among the X-ray sources of the "serendipitous" XMM-Newton survey presented in the 3XMMDR4 catalog (the median X-ray flux is ≈5 × 10^-15 erg s^-1 cm^-2 in the 0.5-2 keV energy band) and located at high Galactic latit…