GB1508+5714: a radio-loud quasar with z=4.30 and the space density of high redshift, radio--loud quasars.

I. M. Hook, R. G. McMahon, A. R. Patnaik +4

We report the discovery of a radio loud quasar with a redshift of 4.30. This object, which is the first radio selected quasar with a redshift greater than four, was discovered duri…