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Powerful radio sources and quasars emit relativistic jets of plasma and magnetic fields that travel hundreds of kiloparsecs, ultimately depositing energy into the intra‐ or inter‐cluster medium. In the rest frame of the jet, the energy density of the cosmic microwave background is enhanced by the bulk Lorentz factor as Γ 2 , and when this exceeds the magnetic energy density the primary loss mechanism of the relativistic electrons is via inverse Compton scattering.  The microwave energy densityis also enhanced by a factor (1 +  z ) 4 , which becomes important at large redshifts. We are surveying a  z  > 3 subsample of radio sources selected with centimeter‐wavelength flux density >70 mJy, and with a spectroscopic redshift. Out of the first 12 objects observed, there are two clear cases of the X‐rays extending beyond the detectable radio jet.

Relativistic X‐ray jets at high redshift