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Our  XMM–Newton  spectrum of the giant, high‐redshift  ( z = 1.88)  radio galaxy 6C 0905+39 shows that it contains one of the most powerful, high redshift, Compton‐thick quasars known. Its spectrum is very hard above 2 keV. The steep  XMM–Newton  spectrum below that energy is shown to be due to extended emission from the radio bridge using  Chandra  data. The nucleus of 6C 0905+39 has a column density of  3.5 +1.4  −0.4 × 10 24  cm −2   and absorption‐corrected X‐ray luminosity of  1.7 +0.9  −0.1 × 10 45  erg s −1   in the 2–10 keV band. A lower redshift active galaxy in the same field, SDSS J090808.36+394313.6, may also be Compton thick.

The Compton‐thick quasar at the heart of the high‐redshift giant radio galaxy 6C 0905+39