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We take a sample of 94 ultraluminous, optical quasars from the search of over14,486 deg^2 by Onken et al. 2022 in the range 4.4<redshift<5.2 and match themagainst the Rapid ASKAP Continuum Survey (RACS) observed on the AustralianSquare Kilometre Array Pathfinder (ASKAP). From this most complete sample ofthe bright end of the redshift ~5 quasar luminosity function, there are 10radio continuum detections of which 8 are considered radio-loud quasars. Theradio-loud fraction for this sample is 8.5 \pm 2.9 per cent. Jiang et al. 2007found that there is a decrease in the radio-loud fraction of quasars withincreasing redshift and an increase with increasing absolute magnitude at restframe 2500 Angstroms. We show that the radio-loud fraction of our quasar sampleis consistent with that predicted by Jiang et al. 2007, extending their resultto higher redshifts.

Ultraluminous Quasars At High Redshift Show Evolution In Their Radio-Loudness Fraction In Both Redshift And Ultraviolet Luminosity