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Q1745 + 624 is located at redshift z = 3.89, and is one of the most distant quasars observed in the X-ray band. Q1745 + 624 was clearly detected with ASCA in the 0.5–7 keV X-ray band, or in 2.4–34 keV in the quasar rest frame. If the energy spectrum is fitted by a single power law with photoelectric absorption, the photon index becomes 1.68−0.24+0.25, and the column density NH becomes 2.1−1.4+1.5 ...

Observations of the high-redshift quasar Q1745 + 624 (z = 3.9) with ASCA