机译:The X-ray properties of z 4 quasars
Penn State Univ, Dept Astron & Astrophys, 525 Davey Lab, University Pk, PA 16802, USA.;
Galaxies : active; Galaxies : nuclei; Quasars : general; X-rays; High-redshift quasars; Radio-loud quasar; Upper limits; Statistical-methods; Spectral evolution; Astronomical data; Vla observations; Z=4; 72 blazar; Z-greater-than-4; Qso;